81. 



ll;. Buccal cavity absent, indistinct, or a very short, narrow ti:be. . . l5 

 Buccal cavity well developed. ..... ...... 18 



15. All or some of the cephalic setae dilated distally .... 16 



Cephalic setae normal .17 



16. All 10 cephalic setae dilated distally. . . . Tubolaimella Allgen, 193U 

 Only the k anterior setae dilated Linhomoella Cobb, 1920 



17. 12 papillose cephalic setae; papillae on tail 



Anticyathus Cobb, 1920 



10 long cephalic setae; no papillae on tail 

 Sphaerocephalum Filipjev, I9I8 



18. Buccal cavity cup-shaped, never longer than wide 19 



Buccal cavity cylindrical, longer than wide 



E\imorpholaiirius Schuiz, 1932 



Pandolairnus Allgen, 1929 



Filipjevinema Allgen, 1953 



Pulchranemella Cobb, 1932 



19. Buccal cavity armed with teeth, or very thick cuticular plates 



Linhon'oeus Bastian, 1865 



Buccal cavity unarmed, thin walled 20 



20. 12 cephalic setae Peril inhomoeus Stekhoven, 1950 



10 cephalic setae 21 



21. "Labial palps" presence Crystallenema Cobb, 1920 



"Labial palps" absent Paralinhornoeus de Man, 1907 



Subfairlly SPHAEROLABilNAE 

 (Key to genera modified from Chitwood, 1951) 



1. Cephalic sensory organs papilloid or setose • 2 



Cephalic sensory organs not observed. . . . Sphaerolaimus Bastian, l8o5 



2. Cephalic sensory organs papilloid Tripylium Cobb, 1920 



Cephalic sensory organs setose .3 



3. Female with one anterior out-stretched ovary. . . Omicronema Cobb, 1920 

 Female with one posterior out-stretched ovary . Halanonchus Cobb, 1920 



