8, 



Subfamily RHAHDITINA'5 

 (Key to genera modified from Osche, 1952 and following Dougherty, 1955) 



1. Male pelodern (bursa not surrounding tail tip) 2 



Male leptodem (biirsa surrounding end of tail) 8 



2. Spicules fused 3 



Spicules not fused 5 



3. Vulva posteriorly positioned U 



Vulva more or less equatoriaily positioned. . Pelodera Schneider, 1966 P. 9 



k. Lip region Teratocephalus- like (moveable flap-like lios separated by 

 deep furrows): males rare 



Teratorhabditis (Osche, 1952) Dougherty, 1953 P-13 



Lip region otherwise. . . Mesorhabditis (Osche, 1952) Dougherty, 1953 P.12 



5. Vulva posteriorly positioned Pelodera Schneider, 1866 P. 9 



Vulva equatoriaily positioned 6 



6. Distinct esophageal collar absent 



Pelodira plicata (Volk, 1950) Dougherty, 1955 



Esophageal collar present . 7 



7. Glottoid apparatus with two teeth 



Caenorhabditis (Osche, 1952) Dougherty, 1953 P.12 



Glottoid apparatus without teeth Rhabditis Dujardin, l8LiU P. 10 



8. Male without preanal papillae; lips Teratocephalus- like 

 Teratorhabditis (Osche, 1952) Dougherty, 1953 P'13 



Male with mostly 3 preanal papillae; lips otherwise 

 Rhabditis Dujardin, 18UU P. 10 



Other genera: 



Rhabditonema Korner, 195U 



Family CHAI-IBRRSIELLIDAE Sanwall, 1957 

 Genus Chambersiella Cobb, 1920 



Single reflexed ovary rodens Cobb, 1920 



Two opoosed and reflexed ovaries bakeri Cobb, 1920 



Family CYLINDROCORPORIDAE Goodey, 1939 

 (Key to the genera) 



Female gonad single, prodelphic Goodeyus Chitwood, 1933 



Female gonads paired, opposed and reflexed 



Cylindrocorpus Goodey, 1939 



(Uncertain genus; no specimens or drawings 

 hyctolaimus Cobb, 1920 



