2$. 



Family DIFLOGASTERIDATC Steiner, 1929 

 (Key to subfamilies modified from Chitwood, 1950) 



1. Stoma consisting of 2 well developed parts in tandem; teeth, if 



present, in posterior part of stoma CEPHALOBIINAE Filipj., 193U P. 26 



Stoma otherwise 2 



2. Stoma narrow, with basal enlargements simulating a stylet 

 TYLOPHARYNGINAE Filipj., 1939 



(Contains a single species, Tylopharynx striata (de Man, 1876) 

 Goodey, 1951) 

 Stoma not simulating a stylet 3 



3. Stoma very short and wide, retrose teeth at base present or absent 



PRISTIONCHINAE Chit., 19$0 P. 26 



Stoma not short and wide h 



U. Prostom wide, heavily sclerotized, containing large retrose teeth, 

 metastoma collapsed or very weakly sclerotized; labial rugae prom- 

 inent DIPLOGASTERINAE Micol., 1922 P-26 



Stoma cylindrical to prismatoidal or collapsed; labial rugae absent 



or very weak DIPLOGASTRROIDINAE Filipj. & Stek., 19hl ^'^^ 



Subfamily DIPLOGASTcHOrDINAE Filipj. & Stekh., 19Ul 

 (Key to the genera modified from Allen, 1950) 



1. Pharynx without teeth, denticles or glottoid apparatus 



Rhabditolaimus Fuchs, 1915 



Pharynx armed with a dorsal tooth 2 



2. Armature in anterior end of pharynx .... Neodlplogaster Cobb, 192U 

 Armature in basal portion of pharynx 3 



3. Median biilb elongate, not distinctly set off from corpus of esophagus 



Demaniella Steiner, I9IU 



Median bulb rounded, distinctly set off from corpus of esophagus 

 h 



1;. Male tail without a bursa 5 



Male tail with an obscure postanal bursa 

 Rhabdontolaimus Flichs, 1931 



5. Stoma cylindrical Diplogasteroides de Han, 1912 



Stoma barrel-shaped Goffartia Hirschmann, 1952 



