Order Dorylaimida Andrassy 2009

Key to the Families and Genera of the Order Dorylaimida

Adapted from Andrassy (2009) by Howard Ferris (November, 2014)

1	a	Stoma with subventral mural tooth, stoma wide, cardia with 3 gland cells	Nygolaimina	2
1	b	Stoma with axial odontostyle, stoma narrow, cardia small, without gland cells	Dorylaimina	17
2	Nygolaimina Ahmad & Jairajpuri, 1979
	Nygolaimoidea Thorne, 1935
	a	Female reproductive system monovarial, opisthodelphic; basal part of esophagus with a sheath of spiral muscles	Nygellidae	4
	b	Female reproductive system diovarial, amphidelphic; basal part of esophagus with a thin muscle sheath which is difficult to discern		3
3	a	Anterior part of stoma bowl-shaped and sclerotized	Aetholaimidae	5
3	b	Anterior part of stoma simple, without sclerotization	Nygolaimidae	6
4	Nygellidae Andrassy, 1958
	Nygelliinae Andrassy, 1958
	a	Body length < 1.4 mm; cuticle thin with fine transverse striations; lip region continuous with body contour	Nygellus Thorne, 1939
5	Aetholaimidae Jairajpuri, 1965
	Aetholaimiinae Jairajpuri, 1965
	a	Body length < 1.4 mm; cuticle thin with fine transverse striations	Aetholaimus Williams, 1962
6	Nygolaimidae Thorne, 1935
	a	Basal part < 1/2 of esophagus length; esophageal gland nuclei not enlarged; cardia with 3 small transversely-ovoid glands; vulva transverse; , no paravulvae	Nygolaiminae	7
	b	Basal part < 1/2 of esophagus length; esophageal gland nuclei enlarged and readily visible; cardia with 3 longitudinally-ovoid glands; vulva longitudinal; ventral adanal region with papillae or pores (paravulvae)	Paravulvinae	15
	c	Basal part about 2/3 of esophagus length; cardial disk, no cardia glands; vulva transverse, no paravulvae	Nygolaimellinae	16
7	Nygolaiminae Thorne, 1935
	a	Mural tooth needle-like, no lumen		8
	b	Mural tooth deltoid, linear or dorylaimoid, with lumen		10
8	a	Tail elongate with clavate terminus	Clavicauda Heyns, 1968
8	b	Tail short and bluntly rounded, not clavate		9
9	a	Labial region offset by a constriction, anterior body contour not continuous	Solididens Heyns, 1968
9	b	Labial region continuous with body contour	Feroxides Heyns, 1968
10	a	Tail long, elongate-conoid, ventrally arcuate	Afronygus Heyns, 1968
10	b	Tail short, convex-conoid to rounded, or clavate		11
11	a	Tooth dorylaimoid with dorsal aperture	Laevides Heyns, 1968
11	b	Tooth deltoid or linear, without aperture		12
12	a	Labial region offset by a constriction, anterior body contour not continuous; tooth deltoid		13
12	b	Labial region continuous with body contour; tooth deltoid or linear		14
13	a	Male with prominent ventromedian supplements and gubernaculum	Paranygolaimus Heyns, 1968
13	b	Male with weak ventromedian supplements; gubernaculum absent	Nygolaimus Cobb, 1913
14	a	Tooth linear, tail convex-conoid or rounded	Aquatides Heyns, 1968
14	b	Tooth deltoid or linear, tail rounded to clavate	Clavicaudoides Heyns, 1968
15	Paravulvinae Ahmad & Jairajpuri, 1968
15	a	Vulva longitudinal; cardia glands longitudinally ovoid	Paravulvus Heyns, 1968
16	Nygolaimellinae Clark, 1961
16	a	Basal part about 2/3 of esophagus length; cardial disk, no cardia glands; vulva transverse	Nygolaimellus Loos, 1949
17	Dorylaimina Pearse, 1936
	a	Odontostyle usually < 2x lip width; anterior section of esophagus slender but muscular; posterior without muscular sheath; 5 esophageal nuclei	Dorylaimoidea	18
	b	Odontostyle very long and slender; anterior section of esophagus slender not muscular; posterior without muscular sheath; 3 esophageal nuclei	Longidoroidea	153
	c	Odontostyle usually about 1x lip width; anterior section of esophagus slender but muscular, posterior surrounded by muscular sheath; 5 esophageal nuclei	Belondiroidea	160
	d	Odontostyle usually 1-2x lip width; anterior section of esophagus muscular, posterior section a short bulb without muscular sheath; 5 esophageal nuclei	Tylencholaimoidea	195
18	Dorylaimoidea de Man, 1876
	a	Stoma with 4 large onchia surrounding odontostyle	Actinolaimidae	26
	b	Stoma without large onchia		19
19	a	Cuticle with numerous conspicuous pores with sclerotized ducts	Crateronematidae	42
19	b	Cuticle without pores with sclerotized ducts		20
20	a	Anterior of body strongly tapered to a small head; subcuticular glands present	Paraxonchiidae	49
20	b	Anterior of body gently tapered to a normal dorylaimid head; subcuticular glands absent		21
21	a	Lip region low with the two circles of labial papillae close together	Thorniidae	52
21	b	Lip region normal with the two circles of labial papillae well separated		22
22	a	Sublabial region sclerotized; lips amalgamated; males with few supplements	Thornenematidae	57
22	b	Sublabial region not sclerotized; males with variable number of supplements		23
23	a	Odontostyle long and slender with small aperture; odontophore surrounded by muscular sheath	Nordiidae	68
23	b	Odontostyle intermediate length and diameter with large aperture		24
24	a	Female tail attenuated to filiform; male tail similar or short	Dorylaimidae	86
24	b	Both female and male with short tail		25
25	a	Odontostyle aperture >1/2 odontostyle length; guiding ring plicated, appears double	Aporcelaimidae	110
25	b	Odontostyle aperture <1/2 odontostyle length; guiding ring simple	Qudsianematidae	123
26	Actinolaimidae Thorne, 1939
	a	Odontostyle robust, dorylaimoid; cuticle without longitudinal ridges; anterior and posterior parts of esophagus muscular; vulval lips sclerotized; male and female with similar long tails	Trachypleurosinae	27
	b	Odontostyle fairly robust, dorylaimoid; cuticle usually smooth; anterior and posterior parts of esophagus muscular; vulval lips sclerotized; male with short, rounded tail; female with long tail	Actinolaiminae	32
	c	Odontostyle long and slender; cuticle with longitudinal ridges; anterior part of esophagus non-muscular, mid and and posterior parts muscular; vulval lips not sclerotized; male with short, rounded tail; female with long tail	Brittonematinae	28
27	Trachypleurosinae Thorne, 1939
	a	Stoma with denticles	Trachypleurosum Andrassy, 1959
	b	Tail differs in male and female, elongate to filiform in female, short and rounded in male	Trachactinolaimus Andrassy, 1963
28	Brittonematinae Thorne, 1967
	a	Labial region low; odontostyle fairly robust	Parastomachoglossa Coomans & Loof, 1986
	b	Labial region normal; odontostyle not robust		29
29	a	Cuticle very thick; inner vulval lips wider than vagina	Brasilaimus Zamith & Lordello, 1957
29	b	Cuticle not very thick; inner vulval lips moderately developed		30
30	a	Lip region strong and expanded; male tail with filiform extension	Practinocephalus Andrassy, 1974
30	b	Lip region not expanded; male tail without filiform extension		31
31	a	Anterior of stoma strong and hexagonal	Afratinca Vinciguerra & Clausi, 2000
31	b	Anterior of stoma thin-walled, circular	Actinca Andrassy, 1964
32	Actinolaiminae Thorne, 1939
	a	Cuticle with longitudinal ridges	Actinolaimus Cobb, 1913
	b	Cuticle without longitudinal ridges		33
33	a	Anterior of stoma with 4 sclerotized plates		34
33	b	Anterior of stoma without sclerotized plates		35
34	a	Stoma wall with small denticles	Paractinolaimoides Khan. Ahmad & Jairajpuri, 1994
34	b	Stoma wall without denticles	Scleroactinolaimus Ahmad, Khan & Ahmad, 1993
35	a	Onchia fused at base	Metactinolaimus Meyl, 1957
35	b	Onchia separate, not fused		36
36	a	Anterior stoma walls strongly ribbed, basket-like	Westindicus Thorne, 1967
36	b	Anterior stoma walls not ribbed		37
37	a	Anterior stoma wall with denticles		38
37	b	Anterior stoma wall without denticles		39
38	a	Male supplements in a linear series	Paractinolaimus Meyl, 1957
38	b	Male supplements in clusters or fascicles	Afractinolaimus Andrassy, 1970
39	a	Male supplements in a linear series		40
39	b	Male supplements in clusters or fascicles		41
40	a	Anterior part of esophagus muscular	Egtitus Thorne, 1967
40	b	Anterior part of esophagus non-muscular	Stopractinca Khan, Ahmad & Jairajpuri, 1994
41	a	Onchia each with two small additional denticles	Neoactinolaimus Thorne, 1967
41	b	Onchia without additional denticles	Mactinolaimus Andrassy, 1970
42	Crateronematidae Siddiqi, 1969
	a	Slender nematodes; cuticular pores indistinct; odontostyle very thin with small aperture; females diovarial, amphidelphic; tail conoid to elongate-conoid	Crateronematinae	47
	b	Moderately slender nematodes; cuticular pores distinct; odontostyle thick with large aperture, often >1/2 odontostyle length; females monovarial or diovarial; tail short, rounded or elongate-conoid	Lordellonematinae	43
43	Lordellonematinae Siddiqi, 1969
	a	Female reproductive system monovarial, opisthodelphic	Sicorinema Siddiqi, 1969
	b	Female reproductive system diovarial		44
44	a	Cuticle with conspicuous lateral, ventral and dorsal pores		45
44	b	Cuticle without conspicuous pores; odontostyle short and thick with large aperture	Sicorinemella Andrassy, 2009
45	a	Odontostyle length about 1x labial width with large aperture, >1/2 odontostyle length	Moshajia Siddiqi, 1982
45	b	Odontostyle length > 1x labial width with aperture about 1/3 odontostyle length		46
46	a	Body slender; tail elongate-conoid	Poronemella Siddiqi, 1969
46	b	Body stout; tail short, conoid	Lordellonema Andrassy, 1959
47	Crateronematinae Siddiqi, 1969
	a	Labial region offset from body contour, lips separated; odontostyle thin with small aperture	Crateronema Siddiqi, 1969
	b	Labial region continuous with body contour, lips amalgamated; odontostyle thin with small aperture		48
48	a	Tail elongate-conoid, with distinct papillae in male	Chrysonema Thorne, 1929
48	b	Tail short without distinct papillae	Oonaguntus Thorne, 1974
49	Paraxonchiidae Dhanachand & Jairajpuri, 1981
	a	Anterior of body narrowing strongly; neck outline concave; head very small, <1/4 body width at base of esophagus; odontostyle straight or bent dorsally; tail short-conoid or elongate-conoid to filiform	Paraxonchiinae	50
	b	Anterior of body narrowing less strongly; neck outline concave; head small, about 1/3 body width at base of esophagus; odontostyle straight; tail short-conoid or conoid-rounded	Gopalinae	51
50	Paraxonchiinae Dhanachand & Jairajpuri, 1981
	a	Odontostyle straight with small aperture	Parapalus Loof & Zullini
	b	Odontostyle bent dorsally with large aperture	Paraxonchium Krall, 1958
51	Gopalinae Andrassy, 2009
	a	Odontostyle length >2x labial width, aperture about 1/4 length of odontostyle	Gopalus Khan, Jairajpuri & Ahmad, 1987
	b	Odontostyle length about 1x labial width, aperture about 1/2 length of odontostyle	Tendinema Siddiqi, 1995
52	Thorniidae De Coninck, 1965
	a	Head with lips amalgamated; two circles of labial papillae separated; odontostyle narrowing posteriorly; male with gubernaculum	Thorniinae	53
	b	Head with lips amalgamated; two circles of labial papillae very close; odontostyle narrowing posteriorly; male without gubernaculum	Thorneellinae	55
53	Thorniinae De Coninck, 1965
	a	Male spicules short and straight without inner scerotization		54
	b	Male spicules arcuate with inner scerotization; gubernaculum present	Nygolaimoides Meyl in Andrassy, 1960
54	a	Labial region offset from body contour; 6 small liplets within the outer labia	Thorniosa Andrassy, 1996
54	b	Labial region not offset from body contour; without inset liplets	Thornia Meyl, 1954
55	Thorneellinae Andrassy, 1987
	a	Anterior stoma with a sclerotized ring	Loofilaimus Jairajpuri, Ahmad & Sturhan, 1998
	b	Anterior stoma without sclerotized ring		56
56	a	Male with 3-4 supplements	Sphaeroamphis Ahmad & Sturhan, 2000
56	b	Male without supplements	Thorneella Andrassy, 1960
57	Thornenematidae Siddiqi, 1969
	a	Female tail elongate; male tail elongate or short, rounded	Thornenematinae	58
	b	Female and male tails both short and rounded	Willinematinae	65
58	Thornenematinae Siddiqi, 1969
	a	Anterior of body narrow, bottle-shaped; amphids small	Lagenonema Andrassy, 1987
	b	Anterior of body not bottle-shaped; amphids large		59
59	a	Female tail attenuated to long; male tail short, round		60
59	b	Tails of males and females similar, either long or short, rounded		63
60	a	Female reproductive system monovarial, opisthodelphic		61
60	b	Female reproductive system diovarial, amphidelphic		62
61	a	Labial framework and esophageal collaretet sclerotized	Thornenema Andrassy, 1959
61	b	Labial framework and esophageal collaret not sclerotized	Opisthodorylaimus Ahmad & Jairajpuri, 1982
62	a	Collaret present; male with 15-17 ventromedian supplements, contiguous	Prothornenema Baqri & Bohra, 2003
62	b	Collaret absent; male with 10-15 ventromedian supplements, spaced	Coomansinema Ahmad & Jairajpuri, 1989
63	a	Tail long in both males and females		64
63	b	Tail short, rounded in both males and females		65
64	a	Female reproductive system diovarial, amphidelphic	Sicaguttur Siddiqi, 1971
64	b	Female reproductive system monovarial, opisthodelphic	Indodorylaimus Mehdi Ali & Prabha, 1974
65	Willinematinae Andrassy, 1987
	a	Female reproductive system diovarial with both branches equally developed, amphidelphic		66
	b	Female reproductive system monovarial or monovarial with rudimentary anterior branch, opisthodelphic		67
66	a	Body very slender, 2.9-4.6 mm long	Anadorella Siddiqi, 2005
66	b	Body very small, 0.4-0.6 mm long	Paratimminema Rahaman, Ahmad & Khan, 1994
67	a	Cephalic framework and collaret sclerotized	Sclerolabia Carbonell & Coomans, 1986
67	b	Cephalic framework and collaret not sclerotized	Willinema Baqri & Jairajpuri, 1967
68	Nordiidae Jairajpuri & Siddiqi, 1964
	a	Odontostyle needle-like, <3x labial width; lips with raised papillae; vulva transverse, usually diovarial, amphidelphic; tail conoid; body length 0.6-2.2 mm	Oriverutinae	69
	b	Odontostyle 2-9x labial width; labial papillae not raised; diovarial, amphidelphic or monovarial, opisthodelphic; tail short, conoid or cylindroid; body length 0.4-1.6 mm, usually robust	Nordiinae	69
	c	Odontostyle 2-5x labial width; lips with raised papillae;, usually diovarial, amphidelphic; tail rounded or filiform; body length 1-8 mm	Pungentinae	69
69	Pungentinae Siddiqi, 1964
	Oriverutinae Andrassy, 2009
	Nordiinae Jairajpuri & Siddiqi, 1964
	a	Female tail elongate; male tail rounded	Californidorus Robbins & Weiner, 1978 (Pungentinae)
	b	Tail similar in both sexes, either short or long		70
70	a	Head strongly expanded; amphid apertures on lateral lips	Kochinema Heyns, 1963 (Pungentinae)
70	b	Head not expanded; amphid apertures post-labial		71
71	a	Odontostyle >3x labial diameter		72
71	b	Odontostyle <3x labial diameter		74
72	a	Odontostyle 8-9x labial diameter; posterior of body twisted	Acunemella Andrassy, 2002 (Nordiinae)
72	b	Odontostyle 3-5x labial diameter; posterior of body not twisted		73
73	a	Tail cylindroid with broadly-rounded terminus	Thornedia Husain & Khan, 1965 (Nordiinae)
73	b	Tail conoid or conoid-rounded with narrowly-rounded terminus	Longidorella Thorne, 1939 (Nordiinae)
74	a	Odontostyle very thin, needle-like, aperture hardly discernible		75
74	b	Odontostyle not needle-like, aperture discernible		76
75	a	Female reproductive system diovarial, amphidelphic	Malekus Thorne, 1974 (Oriverutinae)
75	b	Female reproductive system monovarial, opisthodelphic	Oriverutoides Ahmad & Sturhan, 2002 (Oriverutinae)
76	a	Tail in both sexes long, filiform		77
76	b	Tail in both sexes short-conoid to elongate-conoid		78
77	a	Male with numerous contiguous ventro-median supplements	Lenonchium Siddiqi, 1965 (Pungentinae)
77	b	Male with few, well-spaced, ventro-median supplements	Enchodorus Vinciguerra, 1976 (Pungentinae)
78	a	Lips large, separate, with strongly projecting papillae		79
78	b	Lips not large, papillae not strongly projecting		80
79	a	Tail short-conoid, ventrally arcuate	Inbionema Loof & Zullini, 2000 (Oriverutinae)
79	b	Tail elongate-conoid, dorsally arcuate	Oriverutus Siddiqi, 1971 (Oriverutinae)
80	a	Stoma with thick, hyaline walls; male with numerous supplements (26-31)	Lanzavecchia Zullini, 1988 (Pungentinae)
80	b	Stoma with thin walls; male with <16 supplements		81
81	a	Head rounded, continuous with body contour; tail bent dorsally	Actinolaimoides Meyl, 1957 (Nordiinae)
81	b	Head offset from body contour; tail not bent dorsally		82
82	a	Anterior walls of stoma with four sclerotized platelets		83
82	b	Anterior walls of stoma without sclerotized platelets		84
83	a	Odontostyle 2-3x labial diameter, very slender, slightly curved; guiding ring double	Pungentus Thorne & Swanger, 1936 (Pungentinae)
83	b	Odontostyle <2x labial diameter, straight; guiding ring simple	Pungentella Andrassy, 2009 (Pungentinae)
84	a	Cuticle near vulva strongly wrinkled	Rhyssocolpus Andrassy, 1971 (Pungentinae)
84	b	Cuticle near vulva not wrinkled		85
85	a	Tail rounded; posterior male supplements within 1x spicule length of cloaca	Enchodelus Thorne, 1939 (Pungentinae)
85	b	Tail conoid; posterior male supplements > 1x spicule length from cloaca	Heterodorus Altherr, 1952 (Pungentinae)
86	Dorylaimidae De Man, 1876
	a	Cuticle smooth; odontostyle moderate; guiding ring narrow; vulva longitudinal, V<50%; spicules simple; male with only 1 or 2 supplements; tails in both sexes filiform; body length 0-8-1.0 mm	Amphidorylaiminae	87
	b	Cuticle smooth or with fine transverse striations; odontostyle strong, straight; guiding ring thin; vulva longitudinal, V<50%; spicules dorylaimid; male with numerous supplements; tails in both sexes elongate to filiform; body length up to 5 mm	Prodorylaiminae	87
	c	Cuticle smooth or with distinct or longitudinal ridges striations; odontostyle strong, straight >1x labial diameter; guiding ring double; spicules dorylaimid; male with numerous supplements; tail in female elongate to filiform, short and rounded in male; body length up to 9 mm	Dorylaiminae	87
	d	Cuticle smooth or with fine transverse striations; odontostyle medium size; guiding ring simple; spicules dorylaimid; male with numerous supplements; tails differ between sexes, short mamillate or elongate to filiformin female, short and rounded in male; body length usually 1-3mm	Mesodorylaiminae	87
	e	Cuticle smooth; odontostyle long and thin; guiding ring simple; vulva usually longitudinal; tails in both sexes similar or dissimilar; body length 0.8- 5 mm	Afrodorylaiminae	87
87	Amphidorylaiminae Andrassy, 1976
	Prodorylaiminae Andrassy, 1969
	Dorylaiminae de Man, 1876
	Mesodorylaiminae Andrassy, 1969
	Afrodorylaiminae Andrassy, 1969
	a	Stoma with sclerotized pieces	Fuscheila Siddiqi, 1982 (Mesodorylaiminae)
	b	Stoma without sclerotized pieces		88
88	a	Monosexual; only females present	Drepanodorylaimus Jairajpuri, 1966 (Afrodorylaiminae)
88	b	Bisexual; males and females present		89
89	a	Cuticle with longitudinal ridges		90
89	b	Cuticle without longitudinal ridges		92
90	a	Male supplements arranged in two clusters (fascicles)	Ischiodorylaimus Andrassy, 1969 (Dorylaiminae)
90	b	Male supplements arranged in a continuous series		91
91	a	Female tail elongate to filiform; guiding ring double	Dorylaimus Dujardin, 1845 (Dorylaiminae)
91	b	Female tail conoid-rounded with short projection; guiding ring simple	Kittydorylaimus Andrassy, 1998 (Mesodorylaiminae)
92	a	Tail in both sexes similar, elongate to filiform		93
92	b	Tail in both sexes dissimilar, elongate in female, short and mainly rounded in male		97
93	a	Spicule simple, alaimoid, only 1 or 2 supplements	Amphidorylaimus Andrassy, 1960 (Amphidorylaiminae)
93	b	Spicule dorylaimoid, numerous supplements		94
94	a	Prerectum very long, 15-25x anal body diameter	Protodorylaimus Andrassy, 1988 (Prodorylaiminae)
94	b	Prerectum much shorter		95
95	a	Supplements close together, numbering 13-31	Prodorylaimus Andrassy, 1959 (Prodorylaiminae)
95	b	Supplements spaced, numbering 6-13		96
96	a	Body very slender (a about 60); head rounded, continuous with body contour	Kunjudorylaimus Dhanam & Jairajpuri, 2000 (Prodorylaiminae)
96	b	Body less slender; head truncate	Prodorylaimium Andrassy, 1969 (Prodorylaiminae)
97	a	Male tail conoid, ventrally arcuate	Afrodorylaimus Andrassy, 1964 (Afrodorylaiminae)
97	b	Male tail rounded		98
98	a	Male tail with short terminal peg	Baladorylaimus Andrassy, 2001 (Mesodorylaiminae)
98	b	Male tail without terminal peg		99
99	a	Subcuticle strongly striated	Idiodorylaimus Andrassy, 1969 (Dorylaiminae)
99	b	Subcuticle not striated		100
100	a	Guiding ring double and high		101
100	b	Guiding ring simple and thin		102
101	a	Amphids with very small pore-like aperture	Halodorylaimus Andrassy, 1988 (Dorylaiminae)
101	b	Amphids with wide slit-like aperture	Laimydorus Siddiqi, 1969 (Dorylaiminae)
102	a	Body extremely slender, a = 60-90	Chrysodorus Jimenez-Guirado & Cadenas, 1985 (Mesodorylaiminae)
102	b	Body much less slender		103
103	a	Paired pre- and post-cloacal papillae of male very strong; sperm small and rounded		104
103	b	Paired pre- and post-cloacal papillae of male very small; sperm fusiform		105
104	a	Spicules simple, without inner sclerotization; 4-8 supplements arranged in pairs	Apodorylaimus Andrassy, 1988 (Afrodorylaiminae)
104	b	Spicules with inner sclerotization; 12-18 supplements arranged in a single row	Paradorylaimus Andrassy, 1969 (Afrodorylaiminae)
105	a	Four spindle-shaped yellowish spots near base of odontostyle	Crocodorylaimus Andrassy, 1988 (Mesodorylaiminae)
105	b	No spindle-shaped yellowish spots near base of odontostyle		106
106	a	Each spicule with a small spur near its distal end; posterior part of male body twisted	Calcaridorylaimus Andrassy, 1969 (Mesodorylaiminae)
106	b	Spicules without spurs; posterior part of male body not twisted		107
107	a	Supplements 16-31, arranged in 3 groups: two continuous rows with a few between	Calodorylaimus Andrassy, 1969 (Mesodorylaiminae)
107	b	Supplements in a continuous row		108
108	a	Supplements <5, widely spaced	Miodorylaimus Andrassy, 1986 (Mesodorylaiminae)
108	b	Supplements 5-26, closely spaced		109
109	a	Body length 2.7-3.3 mm; vulva sunken below body contour	Namaquanema Heyns & Swart, 1993 (Mesodorylaiminae)
109	b	Body length 0.8-2.3 mm; vulva not sunken below body contour	Mesodoylaimus Andrassy, 1959 (Mesodorylaiminae)
110	Aporcelaimidae Heyns, 1965
	a	Stoma with mural tooth	Sectonematinae	111
	b	Stoma with axial odontostyle		113
111	Sectonematinae Siddiqi, 1969
	a	Tooth parallel with body axis	Sectonema Thorne, 1930
	b	Tooth at an angle to body axis		112
112	a	Anterior part of stoma with fine rasp-like denticles	Nygolaimium Thorne, 1930
112	b	Anterior part of stoma without denticles	Scapidens Heyns, 1965
113	a	Tail very long and filiform	Aporcedorinae	114
113	b	Tail short, conoid-rounded or hemispharical	Aporcelaiminae	115
114	Aporcedorinae Andrassy, 2009
	a	Tail very long and filiform	Aporcedorus Jairajpuri & Ahmad, 1983
	b
115	Aporcelaiminae Heyns, 1965
	a	Cuticle with 2 layers that refract light differently		116
	b	Cuticle layers refract light similarly		117
116	a	Male with 2-5 pairs of adcloacal supplements; lip region only slightly offset	Makatinus Heyns, 1965
116	b	Male with only 1 pair of adcloacal supplements; lip region strongly offset	Aporcelaimellus Heyns, 1965
117	a	Lip region rounded, lips amalgamated, odontostyle very thick	Acrotonus Thorne, 1974
117	b	Lip region not rounded, lips not or only slightly amalgamated, odontostyle not unusually thick		118
118	a	Vestibule heavily sclerotized, anterior of odontostyle thick	Silvallis Jairajpuri & Ahmad, 1985
118	b	Vestibule not sclerotized, anterior of odontostyle normal		119
119	a	Odontostyle aperture arched dorsally, vulva cuticle wrinkled, very large nematodes (7-9.3 mm)	Epacrolaimus Andrassy, 2000
119	b	Odontostyle aperture not arched dorsally, vulva cuticle smooth		120
120	a	Aperture 1/3 of odontostyle length, vulva lips not sclerotized	Tubixaba Monteiro & Lordello 1980
120	b	Aperture Ã‚Â½ or greater of odontostyle length, vulva lips usually sclerotized		121
121	a	Lip region high, tail conoid and > 1 anal body diameter	Metaporcelaimus Lordello, 1965
121	b	Lip region wide, tail conoid-rounded or hemisperical and < 1 anal body diameter		122
122	a	Body large (4-10 mm), vulval lips sclerotized	Aporcelaimus Thorne & Swanger, 1936
122	b	Body around 2 mm, vulval lips not sclerotized	Aporcella Andrassy, 2002
123	Qudsianematidae Jairajpuri, 1965
	Discolaiminae Siddiqi, 1969
	Carcharolaiminae Thorne, 1967
	Qudsianematinae Jairajpuri, 1965
	Arctidorylaiminae Mulvey & Anderson, 1979
	Ecumenicinae Andrassy, 2009
	a	Females monovarial, opisthodelphic		124
	b	Females diovarial, amphidelphic		125
124	a	Lip region broadly offset and high; lateral fields with conspicuous glands	Latocephalus Patil & Khan, 1982 (Discolaiminae)
124	b	Lip region normal; lateral fields without glands	Ecumenicus Thorne, 1974 (Ecumenicinae)
125	a	Cuticle usually with conspicuous longitudinal ridges	Arctidorylaimus Mulvey & Anderson, 1979 (Arctidorylaiminae)
125	b	Cuticle without longitudinal ridges		126
126	a	Head with sclerotized basket-like structure		127
126	b	Head without sclerotized basket-like structure		129
127	a	Tail conoid, ventrally arcuate, about 2x abd	Caryboca Lordello, 1967 (Carcharolaiminae)
127	b	Tail conoid-rounded to bluntly rounded, ventrally arcuate, about 1x abd		128
128	a	Mouth cavity barrel-shaped and heavily sclerotized posterior to basket-like structure	Caribenema Thorne, 1967 (Carcharolaiminae)
128	b	Mouth cavity simple and slightly sclerotized posterior to basket-like structure	Carcharolaimus Thorne, 1939 (Carcharolaiminae)
129	a	Lateral field with numerous conspicuous glandular structures		130
129	b	Lateral field without glandular structures		136
130	a	Head with inner sclerotized ring or plate structure		131
130	b	Head without inner sclerotized ring or plate structure		132
131	a	Tail conoid, curved ventrally	Mylodiscoides Lordello, 1963 (Discolaiminae)
131	b	Tail bluntly-rounded, short	Mylodiscus Thorne, 1939 (Discolaiminae)
132	a	Posterior section of esophagus surrounded by strong spiral-muscle sheath	Salimella Siddiqi, 2005 (Discolaiminae)
132	b	Posterior section of esophagus without spiral-muscle sheath		133
133	a	Labial region much wider than adjacent body, sucker-like		134
133	b	Labial region not so wide, not sucker-like		135
134	a	Tail elongate filiform	Filidiscolaimus Siddiqi, 1995 (Discolaiminae)
134	b	Tail short, bluntly rounded or conoid rounded	Discolaimus Cobb, 1913 (Discolaiminae)
135	a	Tail elongate, 2-5x abd, prerectum with short blind sac	Discolaimoides Heyns, 1963 (Discolaiminae)
135	b	Tail shorter, <2x abd, prerectum without blind sac	Discolaimium Thorne, 1939 (Discolaiminae)
136	a	Male with adcloacal pair of supplements far from cloaca, odontostyle weakly sclerotized	Amblydorylaimus Andrassy, 1998 (Qudsianematinae)
136	b	Male with adcloacal pair of supplements on anterior cloacal lip		137
137	a	Oral field somewhat sunken with small inner liplets		138
137	b	Oral field without inner liplets		140
138	a	Vulva longitudinal, male with supplements contiguous	Labronema Thorne, 1939 (Qudsianematinae)
138	b	Vulva transverse, male with supplements spaced		139
139	a	Odontostyle longer than lip width, tail short and bluntly rounded	Labronemella Andrassy, 1985 (Qudsianematinae)
139	b	Odontostyle as long as lip width, tail elongate conoid	Baqriella Ahmad & Jairajpuri, 1989 (Qudsianematinae)
140	a	A single ventromedial supplement	Kallidorylaimus Andrassy, 1989 (Qudsianematinae)
140	b	Multiple ventromedial supplements		141
141	a	Intestine with very large vesiculose cells	Kolodorylaimus Andrassy, 1998 (Qudsianematinae)
141	b	Intestine with normal cells		142
142	a	Slender and wider parts of esophagus separated by a constriction	Skibbenema Van Reenen & Heyns, 1986 (Qudsianematinae)
142	b	Slender and wider parts of esophagus not separated by a constriction		143
143	a	Tail with long, apparently empty, distal part	Boreolaimus Andrassy, 1998 (Qudsianematinae)
143	b	Tail without long, apparently empty, distal part		144
144	a	Tail >4x abd (4-8)	Epidorylaimus Andrassy, 1986 (Qudsianematinae)
144	b	Tail <4x abd (1-3)		145
145	a	Odontostyle slender and significantly longer that lip width	Dorydorella Andrassy, 1987 (Qudsianematinae)
145	b	Odontostyle not slender and with length close to lip width		146
146	a	Males with precloacal space absent and posterior pair of supplements level with spicules		147
146	b	Males with precloacal space present and posterior pair of supplements anterior to spicules		148
147	a	Small nematodes (0.3-0.8 mm), esophagus about 1/3 of body length	Microdorylaimus Andrassy, 1986 (Qudsianematinae)
147	b	Larger nematodes (1-3 mm), esophagus about 1/4 of body length	Allodorylaimus Andrassy, 1986 (Qudsianematinae)
148	a	Cardia with three gland cells	Torumanawa Yeates, 1967 (Qudsianematinae)
148	b	Cardia without three glands		149
149	a	Tail subdigitate	Talanema Andrassy, 1991 (Qudsianematinae)
149	b	Tail conoid or rounded		150
150	a	Tail conoid, straight or ventrally arcuate	Eudorylaimus Andrassy, 1959 (Qudsianematinae)
150	a	Tail bluntly rounded		151
151	a	Anterior region of esophagus strongly muscular; spermatozoa minute, <0.1 abd	Crassogula Andrassy, 1991 (Qudsianematinae)
151	b	Anterior region of esophagus moderately muscular; spermatozoa minute, 0.2-0.25 abd		152
152	a	Head continuous with body contour; lips amalgamated	Scalpellus Ahmad, 2004 (Qudsianematinae)
152	b	Head offset from body contour; lips separate	Crassolabium Yeates, 1967 (Qudsianematinae)
153	Longidoroidea Thorne, 1935
	Longidoridae Thorne, 1935
	a	Odontophore with well-developed flanges; dorsal esophageal nucleus larger than subventral nuclei; females diovarial amphidelphic or monovarial opisthodelphic	Xiphinema Cobb, 1913
	b	Odontophore without flanges or with very small flanges; dorsal esophageal nucleus smaller than subventral nuclei; females diovarial amphidelphic		154
154	a	Amphid apertures pore-like, inconspicuous		155
154	b	Amphid apertures slit-like, conspicuous		156
155	a	Guiding ring near posterior end of odontostyle; males with few supplements and posterior pair well anterior to spicules	Xiphidorus Monteiro, 1976
155	b	Guiding ring near anterior end of odontostyle; males with several supplements and posterior pair close to spicules	Longidorus Micoletzky, 1922
156	a	Amphids pouch-like with bilobed fovea		157
156	b	Amphids funnel or stirrup-shaped, not bilobed		158
157	a	Lip region sharply offset from body contour, guiding ring at posterior end of odontostyle	Australodorus Coomans, Olmos, Casella & Chaves, 2004
157	b	Lip region continuous with body contour, guiding ring at anterior end of odontostyle	Longidoroides Khan, Chawla & Saha, 1978
158	a	Lip region continuous with body contour	Paralongidorus Siddiqi, Hooper & Khan, 1963
158	b	Lip region sharply offset from body contour		159
159	a	Guiding ring at posterior end of odontostyle; males with supplements anterior to spicules	Paraxiphidorus Coomans & Chaves, 1995
159	b	Guiding ring at anterior end of odontostyle; males with posterior supplements closer to spicules	Siddiqia Khan, Chawla & Saha, 1978
160	Belondiroidea Thorne, 1939
	a	Odontophore flanged; four sclerotized pieces around oral opening	Dorylaimellidae	162
	b	Odontophore rod-like, not flanged; oral opening without sclerotized pieces		161
161	a	Tail in both sexes short, conoid- rounded or cylindroid	Belondiridae	165
161	b	Female tail long and filiform	Swangeriidae	183
162	Dorylaimellidae Jairajpuri, 1964
	a	Females monovarial, prodelphic		163
	b	Females diovarial, amphidelphic or, rarely, monovarial, opisthodelphic		164
163	a	Vulva longitudinal; tail filiform	Ibadamus Siddiqi, 1983
163	b	Vulva transverse; tail short, rounded	Mesodorylaimus Jairajpuri & Ahmad, 1980
164	a	Tail cylindroid or clavate with thick terminal cuticle; vulva transverse	Axodorylaimellus Jairajpuri & Ahmad, 1980
164	b	Tail without thick terminal cuticle; vulva transverse; vulva longitudinal	Dorylaimellus Cobb, 1913
165	Belondiridae Thorne, 1939
	a	Lip region simple or with small liplets, continuous with body contour; anterior and posterior esophageal regions not separated by a constriction; posterior region of esophagus with spiral muscle sheath; tail in both sexes short and rounded	Belondirinae	166
	b	Lip region without liplets; anterior and posterior esophageal regions separated by a narrowing or deep constriction; posterior region of esophagus with straight rather than spiral muscle sheath; tail in both sexes short	Axonchiinae	175
166	Belondirinae Thorne, 1939
	a	Females monovarial		167
	b	Females diovarial		170
167	a	Females prodelphic	Probelondira Andrassy, 2009
167	b	Females opisthodelphic		168
168	a	Lip region with mammiform papillae	Axonchoides Thorne, 1967
168	b	Lip region rounded, without mammiform papillae		169
169	a	Anterior slender part of esophagus 2/3 of esophagus length; male with 11 supplements	Immanigula Andrassy, 1991
169	b	Anterior slender part of esophagus about 1/2 of esophagus length; male with 1-2 supplements	Belondira Thorne, 1939
170	a	Muscular esophageal sheath with muscle bundles twisted sinistrally (to the left side)		171
170	b	Muscular esophageal sheath with muscle bundles straight or twisted dextrally (to the right side)		172
171	a	Male without supplements	Amphibelondira Rahman, Jairajpuri, Ahmad & Ahmad, 1987
171	b	Male with 5-7 supplements	Helicobelondira Yeates, 1973
172	a	Lip region with small perioral liplets; tail clavate	Belondirella Thorne, 1964
172	b	Lip region rounded; tail not clavate		173
173	a	Lip region continuous with body contour	Porternema Suryawanshi, 1972
173	b	Lip region offset from body contour		174
174	a	Oral opening with small platelets; odontostyle thick	Belaxellus Thorne, 1974
174	b	Oral opening without platelets; odontostyle slender	Bullaenema Sauer, 1968
175	Axonchiinae Thorne, 1964
	a	Female diovarial, amphidelphic	Anchobelondira Nair & Coomans, 1971
	b	Female monovarial, opisthodelphic		176
176	a	Esophagus very long, > 1/2 body length	Nimigula Andrassy, 1985
176	b	Esophagus shorter than 1/2 body length		177
177	a	Odontostyle slender with length 2x lip width	Heynsaxonchium Coomans & Nair, 1975
177	b	Odontostyle fusiform with length about 1x lip width		178
178	a	Tail subdigitate	Dactyluraxonchium Coomans & Nair, 1975
178	b	Tail hemispherical or conoid		179
179	a	Spicules very long and slender, not typical dorylaimoid		180
179	b	Spicules normal, more typical dorylaimoid		181
180	a	Vagina strongly inclined to the posterior; male with 4-6 supplements	Uniqaxonchium Dhanam & Jairajpuri, 1998
180	b	Vagina moderately inclined to the posterior; male with 2 supplements	Phallaxonchium Jairajpuri & Dhanachand, 1979
181	a	Lip region continuous with body contour; lips amalgamated	Syncheilaxonchium Coomans & Nair, 1975
181	b	Lip region offset from body contour; lips separate		182
182	a	Vulval lips sclerotized	Metaxonchium Coomans & Nair, 1975
182	b	Vulval lips not sclerotized	Axonchium Cobb, 1920
183	Swangeriidae Jairajpuri, 1964
	a	Female and male tails dissimilar, long in female, short and rounded in male	Roqueinae	184
	b	Female and male tails similar, filiform in both sexes		185
184	Roqueinae Thorne, 1964
	a	Odontostyle very slender; muscular sheath of posterior esophageal region twisted to the left (sinistral)	Lindseyus Ferris & Ferris, 1973
	b	Odontostyle thick, fusiform; muscular sheath of posterior esophageal region twisted to the right (dextral)	Roqueus Thorne, 1974
185	a	Odontostyle with a small dorsal projection at posterior end of its aperture; dorsal esophageal gland located near middle of posterior esophageal region	Falcihastinae	186
	b	Odontostyle without dorsal projection; dorsal esophageal gland located near anterior of posterior esophageal region	Swangeriinae	189
186	Falcihastinae Siddiqi, 1968
	a	Expanded posterior of esophagus about 1/4 of esophagus length		187
	b	Expanded posterior of esophagus >= 1/2of esophagus length		188
187	a	Lip region conoid, asymmetrical	Falcihasta Clark, 1964
187	b	Lip region rounded, symmetrical	Paraqudsiella Siddiqi, 1982
188	a	Female diovarial, amphidelphic	Motoaxonchium Yeates, 1973	76
188	b	Female monovarial, prodelphic	Hulqus Siddiqi, 1982
189	Swangeriinae Jairajpuri, 1964
	a	Odontostyle dorylaimoid; lip region slightly asymmetrical	Oxydirus Thorne, 1939
	b	Odontostyle slender; lip region symmetrical		190
190	a	Female diovarial, amphidelphic		191
190	b	Female monovarial, prodelphic		194
191	a	Vestibule of stoma with basket-like chamber	Swangeria Thorne, 1939
191	b	Vestibule of stoma without basket-like chamber		192
192	a	Body length > 3mm	Paraoxydirus Jairajpuri & Ahmad, 1979
192	b	Body length 1-2 mm		193
193	a	Posterior part of esophagus with distinct muscular sheath	Qudsiella Jairajpuri, 1987
193	b	Posterior part of esophagus without muscular sheath	Durinemella Andrassy, 2009
194	a	Cephalic region with subcuticular sclerotization (collaret)	Oxybelondira Ahmad & Jairajpuri, 1979
194	b	Cephalic region without subcuticular sclerotization	Paraoxybelondira Dhanam & Jairajpuri, 1999
195	Tylencholaimoidea Filipjev, 1934
	a	Cuticle inner layer loose with irregular radial elements (tylencholaimoid)		196
	b	Cuticle inner layer compact without radial elements (dorylaimoid)		197
196	a	Odontostyle slender, often without detectable lumen or aperture; basal expansion of esophagus short, 1/5 to 1/3 of esophagus length	Leptonchidae	200
196	b	Odontostyle more robust with distinct lumen and aperture; basal expansion of esophagus > 1/3 of esophagus length	Tylencholaimidae	224
197	a	Labial papillae cornuate or setiform; cuticle often divided into small blocks	Encholaimidae	247
197	b	Labial papillae normal, papilliform		198
198	a	Odontostyle short and asymmetrical or curved, odontophore also asymmetrical	Mydonomidae	252
198	b	Odontostyle and odontophore symmetrical		199
199	a	Esophagus with three sections: a long slender, gradually-expanding anterior part, a slender intermediate part surrounded by glandular tissue, and a pyriform basal expansion	Aulolaimoididae	256
199	b	Esophagus dorylaimoid, a narrower anterior section and a broader posterior section	Tylencholaimellidae	259
200	Leptonchidae Thorne, 1935
	Leptonchinae Thorne, 1935
	Belonenchinae Thorne, 1964
	Tyleptinae Jairajpuri, 1964
	Xiphinemellinae Jairajpuri, 1964
	a	Odontostyle very slender, needle-like, without visible lumen or aperture		201
	b	Odontostyle usually slender but with distinct lumen and aperture		206
201	a	Females diovarial	Glochidorella Siddiqi, 1982 (Belonenchinae)
201	b	Females monovarial		202
202	a	Females prodelphic		203
202	b	Females opisthodelphic		204
203	a	Lip region rounded; odontophore flanged	Zetalaimus Siddiqi, 1982 (Belonenchinae)
203	b	Lip region cap-like; odontophore simple	Trichonchium Siddiqi & Khan, 1964 (Belonenchinae)
204	a	Odontophore simple, rod-like	Basirotyleptus Jairajpuri, 1964 (Belonenchinae)
204	b	Odontophore flanged		205
205	a	Odontostyle length < lip width; lip-region cap-like	Aculonchus Siddiqi, 1982 (Belonenchinae)
205	b	Odontostyle length > lip width; lip-region rounded	Sclerostylus Goseco, Ferris & Ferris, 1981 (Belonenchinae)
206	a	Odontostyle length several times > lip width	Xiphinemellinae	207
206	b	Odontostyle length <= lip width		208
207	a	Body length of adult 1-3mm; odontophore flanged	Xiphinemella Loos, 1950 (Xiphinemellinae)
207	b	Body length of adult around 0.5mm; odontophore not flanged	Kantbhala Siddiqi, 1982 (Xiphinemellinae)
208	a	Odontostyle thick with wide lumen and distinct aperture	Tyleptinae	209
208	b	Odontostyle thin with very narrow lumen and minute aperture	Leptonchinae	212
209	a	Odontostyle asymmetric; female gonad prodelphic	Scalpenchus Siddiqi, 1995 (Tyleptinae)
209	b	Odontostyle symmetrical; female monovarial opisthodelphic or diovarial amphidelphic		210
210	a	Odontostyle length +/- 2x lip width	Utahnema Thorne, 1939 (Tyleptinae)
210	b	Odontostyle length <1x lip width		211
211	a	Oral aperture surrounded by inner liplets	Tyleptus Thorne, 1939 (Tyleptinae)
211	b	Oral aperture without inner liplets	Gymnotyleptus Ahmad & Jairajpuri, 1982 (Tyleptinae)
212	a	Female diovarial		213
212	b	Female monovarial		220
213	a	Odontophore with basal knobs	Clavigula Siddiqi, 1995 (Leptonchinae)
213	b	Odontophore simple, without basal swellings		214
214	a	Male with 12-20 supplements, contiguous or closely spaced	Meylis Goseco, Ferris & Ferris, 1974 (Leptonchinae)
214	b	Male with 0-10 supplements, widely spaced		215
215	a	Vulva pore-like	Apoleptonchus Siddiqi, 1982 (Leptonchinae)
215	b	Vulva transverse or longitudinal		216
216	a	Lip region continuous with body contour, lip-region rounded	Bertzuckermania Khera, 1970 (Leptonchinae)
216	b	Lip region offset from body contour, lip-region cap-like		217
217	a	Posterior part of esophagus with two constrictions; intestine surrounding posterior bulb	Incanema Andrassy, 1997 (Leptonchinae)
217	b	Posterior part of esophagus with one constriction; intestine not surrounding posterior bulb		218
218	a	Vulva longitudinal	Funaria Van der Linde, 1938 (Leptonchinae)
218	b	Vulva transverse		219
219	a	Posterior expansion of esophagus pyriform, about 1/5 of esophagus length; odontophore arcuate	Leptonchus Cobb, 1920 (Leptonchinae)
219	b	Posterior expansion of esophagus cylindrical, about 1/3 of esophagus length; odontophore straight	Sclerolaimus Jairajpuri & Ahmad, 1992 (Leptonchinae)
220	a	Female gonad opisthodelphic	Caveonchus Siddiqi, 1982 (Leptonchinae)
220	b	Female gonad prodelphic		221
221	a	Tail filiform in both sexes	Loncharionema Goseco, Ferris & Ferris, 1974 (Leptonchinae)
221	b	Tail short in both sexes		222
222	a	Anterior slender region of esophagus convoluted; basal expansion 1/10 of esophagus length	Paraleptonchus Dhanam & Jairajpuri, 1999 (Leptonchinae)
222	b	Anterior slender region of esophagus not convoluted; basal expansion about 1/4 of esophagus length		223
223	a	Stoma flask-like	Proleptonchus Lordello, 1955 (Leptonchinae)
223	b	Stoma tubular	Proleptonchoides Ferris, Goseco & Kumar, 1979 (Leptonchinae)
224	Tylencholaimidae Filipjev, 1934
	Tylencholaiminae Filipjev, 1934
	Mumtaziinae Andrassy, 1976
	Discomyctinae Andrassy, 2009
	Vanderlindiinae Siddiqi, 1969
	Pachydorylaiminae Andrassy, 2009
	a	Odontostyle with thick walls		225
	b	Odontostyle with normal walls		229
225	Pachydorylaiminae Andrassy, 2009
	a	Tail filiform in both sexes; body length about 1mm	Pachydorylaimus Siddiqi, 1983 (Pachydorylaiminae)
	b	Tail short and rounded in both sexes; body length 2-6mm	Vanderlindiinae	226
226	Vanderlindiinae Siddiqi, 1969
	a	Odontostyle >1x lip width; curved		227
	b	Odontostyle <1x lip width; straight		228
227	a	Head rounded, broad; male supplements in double ventral rows	Vanderlinea Heyns, 1964 (Vanderlindiinae)
227	b	Head cap-like; male supplements in a single ventromedian row	Curvidorylaimus Jairajpuri & Rahman, 1983 (Vanderlindiinae)
228	a	Vulva longitudinal	Neometadorylaimus Jairajpuri & Ahmad, 1982 (Vanderlindiinae)
228	b	Vulva transverse	Metadorylaimus Jairajpuri & Goodey, 1966 (Vanderlindiinae)
229	a	Amphids small with minute pore-like aperture		230
229	b	Amphids larger with slit-like aperture		232
230	Mumtaziinae Andrassy, 1976
	a	Odontostyle irregular shape, length >1x lip width	Mumtazium Siddiqi, 1969 (Mumtaziinae)
	b	Odontostyle regular shape, length <1x lip width		231
231	a	Female diovarial, amphidelphic; odontostyle fusiform	Promumtazium Siddiqi, 1982 (Mumtaziinae)
231	b	Female monovarial, opisthodelphic; odontostyle slender	Tantunema Siddiqi, 1982 (Mumtaziinae)
232	a	Tail long, filiform in both sexes	Discomyctinae	233
232	b	Tail short in both sexes	Tylencholaiminae	236
233	Discomyctinae Andrassy, 2009
	a	Body length 1.7-2.8 mm	Oxydiroides Altherr, 1972 (Discomyctinae)
	b	Body length 0.8-1.5 mm		234
234	a	Odontophore with basal knobs; female monovarial, prodelphic	Discomyctus Thorne, 1939 (Discomyctinae)
234	b	Odontophore simple without basal knobs; female diovarial, amphidelphic		235
235	a	Perioral disc present; odontostyle irregular shape	Lawtonema Siddiqi, 1999 (Discomyctinae)
235	b	Perioral disc absent; odontostyle regular shape	Wasimellus Bloemers & Wanless, 1996 (Discomyctinae)
236	Tylencholaiminae Filipjev, 1934
	a	Subcuticle with distinct regular striations	Cricodorylaimus Ahmad & Sturhan, 2001 (Tylencholaiminae)
	b	Subcuticle with less distinct and irregular striations		237
237	a	Odontostyle distinctly longer than lip width		238
237	b	Odontostyle <=1x lip width		239
238	a	Lip region rounded; odontostyle slightly curved	Chitwoodius Furstenberg & Heyns, 1966 (Tylencholaiminae)
238	b	Lip region cap-like with elevated liplets; odontostyle straight	Chitwoodielloides Ahmad & Araki, 2123 (Tylencholaiminae)
239	a	Odontophore with small basal knobs		240
239	b	Odontophore without basal knobs		243
240	a	Lip region cap-like with elevated inner liplets		241
240	b	Lip region more or less rounded		242
241	a	Stoma surrounded by a small sclerotized ring	Tylenchodoroides Gagarin, 2121 (Tylencholaiminae)
241	b	Stoma without sclerotized ring	Tylencholaimus de Man, 1876 (Tylencholaiminae)
242	a	Odontostyle thick; tail hemispherical	Pseudotylencholaimus Jairajpuri & Ahmad, 1992 (Tylencholaiminae)
242	b	Odontostyle thin; tail conical	Tylenchodorus Siddiqi, 1983 (Tylencholaiminae)
243	a	Lip region rounded, slightly offset; odontostyle irregular	Rostrulium Siddiqi, 1995 (Tylencholaiminae)
243	b	Lip region cap-like, strongly offset; odontostyle regular		244
244	a	Female diovarial, amphidelphic	Chitwoodiellus Jimenez & Peña-Santiago, 1992 (Tylencholaiminae)
244	b	Female monovarial, prodelphic		245
245	a	Perioral disk present; body length 1.7-2 mm	Capilonchus Siddiqi, 1982 (Tylencholaiminae)
245	b	Perioral disk absent; body length short 0.4-0.6 mm	Meylonema Andrassy, 1960 (Tylencholaiminae)
247	Encholaimidae Golden & Murphy, 1967
	a	Cuticle tessellated	Encholaiminae	248
	b	Cuticle smooth	Cephalodorylaiminae	250
248	Encholaiminae Golden & Murphy, 1967
	a	Females monovarial, opisthodelphic; posterior part of esophagus pyriform	Encholaimus Golden & Murphy, 1967
	b	Females diovarial, amphidelphic; posterior part of esophagus cylindroid		249
249	a	Outer labial sensilla long, setose	Helmabia Siddiqi, 1971
249	b	Outer labial sensilla very short	Nemabia Siddiqi, 1995
250	Cephalodorylaiminae Jairajpuri, 1967
	a	Inner labial papillae short, hardly elevated; female monovarial, prodelphic	Acephalodorylaimus Ahmad & Jairajpuri, 1983
	b	Inner labial papillae setose; female monovarial, opisthodelphic or diovarial, amphidelphic		251
251	a	Female diovarial, amphidelphic	Cephalodorylaimus Jairajpuri, 1967
251	b	Female monovarial, opisthodelphic	Echinodorus Siddiqi, 1995
252	Mydonomidae Thorne, 1964
	a	Large nematodes, 3-7 mm	Calolaiminae	253
	b	Shorter nematodes, <3 mm	Mydonominae	254
253	Calolaiminae Goseco, Ferris & Ferris, 1976
	a	Males with two pairs of adcloacal supplements	Timmus Goseco, Ferris & Ferris, 1976
	b	Males with one pair of adcloacal supplements	Calolaimus Timm, 1964
254	Mydonominae Thorne, 1964
	a	Tails of females and males dissimilar, elongate in females and short and rounded in males	Morasia Baqri & Jairajpuri, 1969
	b	Tails of females and males similar		255
255	a	Expanded posterior of esophagus surrounded by a muscular sheath	Mydonomus Thorne, 1964
255	b	Expanded posterior of esophagus without muscular sheath	Dorylaimoides Thorne & Swanger, 1936
256	Aulolaimoididae Jairajpuri, 1964
	a	Tail short and rounded		257
	b	Tail elongate conoid to filiform		258
257	a	Females monovarial	Adenolaimus Andrassy, 1973
257	b	Females diovarial	Oostenbrinkia Ali, Suryawanshi & Ahmad, 1973
258	a	Lips distinct with large papillae	Cladocephalus Swart & Heyns, 1991
258	b	Lips amalgamated with minute papillae	Aulolaimoides Micoletzky, 1915
259	Tylencholaimellidae Jairajpuri, 1964
	a	Amphidial fovea strongly sclerotized	Athernema Ahmad & Jairajpuri, 1978 (Athernematinae Ahmad & Jairajpuri, 1978)
	b	Amphidial fovea simple, not sclerotized		260
260	a	Odontostyle with a convex stiffening piece	Tylencholaimellinae	261
260	b	Odontostyle without stiffening piece	Dorylliinae	263
261	Tylencholaimellinae Jairajpuri, 1964
	a	Stiffening piece of odontostyle on ventral side; females monovarial, prodelphic	Dorella Jairajpuri, 1964
	b	Stiffening piece of odontostyle on dorsal side; females monovarial, opisthodelphic		262
262	a	Labial framework sclerotized	Margollus Peña-Santiago, Peralta & Siddiqi, 1993
262	b	Labial framework not sclerotized	Tylencholaimellus Cobb, 1915
263	Dorylliinae Izatullaeva, 1967
	a	Female diovarial, amphidelphic		264
	b	Female monovarial, opisthodelphic		265
264	a	Odontophore with posterior knobs	Phellonema Thorne, 1964
264	b	Odontophore simple, without knobs	Goferus Jairajpuri & Ahmad, 1992
265	a	Odontostyle very short, with tip appearing broken	Agmodorus Thorne, 1964
265	b	Odontostyle normal		266
266	a	Tail filiform	Oostenbrinkella Jairajpuri, 1965
266	b	Tail short, rounded	Doryllium Cobb, 1920

Adapted from Andrássy (2009) Free-living Nematodes of Hungary, III. Hungarian Natural History Museum