107. 



Subfamily ONCHOLAIiHlNAE Micoletzky, 1922 

 (Key to the genera adapted from Kreis, 193k by M.W. Allen) 



1. Stoma without teeth 22 



Stoma with teeth • 2 



2. Stoma with one tooth 3 



Stoma with two or more teeth h 



3. Stoma with a large typical subventral tooth. Monocholaimus Kreis, 192h 

 Stoma with a long curved spear-like subventral tooth that arises from 



the base of the stoma Doryonchus Kreis, 1932 



Stoma with a very 5inall dorsal tooth Trileptiim (Cobb, 1920) 



U. Stoma with two teeth 5 



Stoma with three or more teeth 6 



5. Stoma with a dorsal tooth and a rudimentary submedian tooth 



Phaenoncholaimus Kreis, 1932 



Stoma with two subequal dorsal teeth. . . . Dioncholaimus Kreis, 1932 



6. Stoma with three teeth. 7 



Stoma with more than three teeth 21 



7. Subventral tooth much larger than the other two teeth; two ovaries, 



spicula long; bursa present Oncholaimellus de Man, 1890 



All three teeth well developed 8 



8. Subventral teeth uniformly large ...... .. 9 



Subventral teeth not uniformly large .11 



9. Tubiform organ present with an opening to the outside; one ovary 



..... Metaparoncholaimus de Coninck and Stekhoven, 1933 



Tubiform organ absent; two ovaries 10 



10. Tail short, gubemaculum large Pontonema Leidy, 1885 



Tail long, no gubemaculum Filoncholaimus Filipjev, 1925 



11. Cuticle with a Trabelzeichnung, one ovary, spicula long 



. . Prooncholaimus Micoletzky, 192U 



Cuticle without Trabelzeichnung, 12 



12. Stoma walls distinctly different from one another 13 



Stoma walls not distinctly different from one another ....... 15 



13. Dorsal wall with a large indentation before the dorsal tooth, stoma 



very long, one ovary Convexolaimus Kreis, 1928 



Dorsal wall rudimentary II4. 



lU. Ventral wall very thin, dorsal wall short, head region set off 



distinctly from the rest of the body by a decrease in the cuticle 



thickness around the head region Cacolaimus Kreis, 1932 



Ventral wall not thin, head not set off, araphids large 



• * Meroviscosia Kreis, 1932 



