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Key to
Species of the Genus Geocenamus
1. Stylet length
equal to or greater than 90 µm……………………………… 2
1a.
Stylet length 20-49 µm…………………………………………… 5
1b.
Stylet length 50-69 µm…………………………………………… 8
2(1).
Tail cylindrical, terminus broadly rounded, annulated……………
3
2a.
Tail conical, terminus narrowly rounded, smooth…….…………… 4
3(2).
Stylet length 120-134 µm;
lateral
field completely
areolated
throughout entire body; cephalic framework strongly
sclerotized…………………………………………… G. arealoferus
3a.
Stylet length 96-107 µm; lateral field not
areolated
throughout entire body; cephalic framework lightly
sclerotized…………………………………………… G. nurserus
4(2a).
Lateral field incisures completely crenate;
L =1530-1813………………………………………. G. kirjanovae
4a.
Lateral field incisures not crenate; L = 1800-2150…. G. tokobaevi
5(1a).
Longitudinal striae extend throughout body………..
6
5a.
Longitudinal striae absent except in lateral
field…... 7
6(5). Tail
terminus narrowly rounded almost to a point;
longitudinal striae 26-28; stylet length 28-29 µm.…
G. patternus
6a. Tail
terminus rounded but not narrowly to a point;
longitudinal striae 20; stylet length 26 µm………… G.
squamatus
7(5a.) Tail
terminus broadly or narrowly rounded, smooth
or
annulated; lateral field areolated on tail,
4 incisures posterior to phasmid, ………………. G.
tenuidens
= G. arcticus
= G. uralensis
7a. Tail
terminus digitate, smooth; Lateral field not
areolated on tail, 6 incisures posterior to phasmid… G.
khashanicus
8(1b).
Longitudinal striations intersect transverse annules
forming series of blocks over entire body………… G.
longus
8a.
Longitudinal striations absent outside of lateral
field……………………………………………….. 9
9(8a). Lip
region with 12 longitudinal incisures………… G.
deserticola
9a. Lip
region with 6 longitudinal incisures…………..
10
10(9a). Female
stylet 67 µm, L = 1120 µm……..………… G. superbus
10a.
Female stylet 50-57 µm, L = 801-996 µm………...
G.
angelescresti
Ref: Chitambar and
Ferris, 2005
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