Key to Families of the Superfamily Criconematoidea

Revised: 10/30/19

(after Andrássy, 2007)


1 a Cuticle thick, coarsely annulated, often with extensions, isthmus broad and amalgamated with basal bulb 2
b Cuticle thin, finely annulated, without extensions, isthmus slender, not amalgamated with basal bulb 3
2 a Females and juveniles cigar-shaped; cuticular annules retrorse, often with extensions; male tail short, bursa small or absent Criconematidae
b Females and juveniles slender, vermiform; cuticular annules rounded; male tail long, bursa large Hemicycliophoridae
3 a Mature female vermiform to elongate-obese; procorpus of esophagus wide; stylet may be long Paratylenchidae
b Mature female saccate or spherical; procorpus of esophagus slender; stylet short 4
4 a Mature female spherical, vulva terminal; excretory pore in anterior 25% of body Sphaeronematidae
b Mature female elongate-obese; vulva not terminal; excretory pore at >50% of body length Tylenchulidae


Key to Genera of the family Criconematidae

after Andrássy, 2007)

1 a Female with a cuticular sheath of rounded annules Hemicriconemoides Chitwood & Birchfield, 1957
  b Female without cuticular sheath 2
2 a Cuticular annules in females and juveniles with scales, spines or other extensions 3
  b Cuticular annules in females smooth, occasionally with extensions in juveniles 9
3 a Cephalic region small, knob-like Blandicephalonema Mehta & Raski, 1971
  b Cephalic region not knob-like, usually with two annules 4
4 a Each cuticular annule with continuous fringe of spines Crossonema Mehta & Raski, 1971
  b Extensions of cuticular annules separated, not fringe-like 5
5 a Cuticular extensions in alternating rows Croserinema Khan, Chawla & Sala, 1976
  b Cuticular extensions not alternating, arranged in longitudinal rows 6
6 a One large saucer-shaped cephalic annule Paterocephalonema Mehta & Raski, 1971
  b Two, sometimes three, moderately-sized cephalic annules 7
7 a Cuticular extensions transparent, membranous Bakernema Wu, 1964
  b Cuticular extensions not membranous 8
8 a Shape and size of cuticular extensions differ on dorsal and ventral sides Orphreyus Siddiqi, 2000
  b Shape and size of cuticular extensions similar on dorsal and ventral sides Ogma Southern, 1914
9 a Annules of juveniles with longitudinal rows of scales or spines; females with smmoth annules, except in tail region 10
  b Annules of both juveniles and females without scales or spines 13
10 a Scales and spines present on annules in posterior region of females Neolobocriconema Mehta & Raski, 1971
  b Scales and spines not present on annules in posterior region of females 11
11 a Cephalic region with submedial lobes Lobocriconema De Grisse & Loof, 1965
  b Cephalic region without submedial lobes 12
12 a Head with one dome-shaped annule; annules with encrustations Amphisbaenema Orton Williams, 1982
  b Head with two ring-like annules; annules without encrustations Criconema Hofmänner & Menzel, 1914
13 a Vulva open; cephalic region with submedial lobes Mesocriconema Andrássy, 1965
  b Vulva closed; cephalic region without submedial lobes 14
14 a Anterior cephalic annule disc-like, offset by a collar Discocriconemella De Grisse & Loof, 1965
  b Anterior cephalic annule not disc-like, not offset 15
15 a Stylet exceedingly long, flexible Xenocriconemella De Grisse & Loof, 1965
  b Stylet not exceedingly long, not flexible 16
16 a Anterior lip of vulva overhanging aperture Nothocriconemoides Loof & De Grisse, 1971
  b Anterior lip of vulva not overhanging aperture Criconemoides Taylor, 1936


Andrássy, I. 2007.  Free-living Nematodes of Hungary (Nematoda Errantia) Vol. II.  Hungarian Natural History Museum. Budapest. Hungary, 496 pp.