76. 



Order CHROnADORIDA Chitwood, 1933 

 (Key to the suborders from Chit. & Chit., 19^0) 



Esooha;:;o-intestinal valve dorsoventraily flattened or circular, 

 moderately lari-^e to very large, never triradiate or vertically 

 flattened; stoma if well developed, unarmed or containing 1 or 3 

 small teeth or 6 outwardly acting teeth; stoma may or may not be 

 surrounded by esophageal tissue; ovaries outstretched or refloxed; 

 papilloid or tuboid supplementary organs present or absent 



MONHYSTERINA (Filipjev, 1929) Chit. & Chit., 1937 P. 76 



Esophago-intestinal valve triradiate or vertically flattened, usually 

 very short; stoma if well developed containing a large dorsal tooth, 

 3 jaws or 6 inwardly acting teeth; stoma surrounded by esophageal 

 tissue; ovaries reflexed; cup-like or tuboid supplementary orgrns pre- 

 sent or absent. . . . CHRCMADORINA (Filipjev, 1929) Chit. & Chit., 1937 P. 76 



Suborder MONHYSTERINA (Filipjev, 1929) Chit. & Chit., 1937 

 (Key to the superfamilies from Chit. & Chit., 19^0) 



1. Amphids circular; ends of esophageal radii convergent; ovaries out- 

 stretched MONHYSTEROIDFA Stek. & de Coninck, 1933 P. 77 



Amphids "plectoid','' spiral or variants; ends of esophageal radii tuboid 

 2 



2. Amphids plectoid or 1-2 spiral; ovaries reflexed 



PLECTOIDEA Chitwood, 1937 P. 82 



Amphids spiral or variants; ovaries outstretched (rarely reflexed). 

 AXONOLAIMOIDFJl Chitwood, 1937 P. 86 



Suborder CIiROM/'J)ORINA,( Filipjev, 1929) Chit. & Chit., 1937 

 (Key to zne superfamilies modified from Chitwood, 19^1) 



1. Cuticle coarsely annulated or, if without distinct annules, covered 

 by "hairy coat" (Marine except for one species) 



DFSMOSCOLECOIDEA Stekhoven, 193? P-90 



Cuticle annulated 2 



2. Cuticle usually punctate, stilt setae and glandular paired setae ab- 

 sent; helmet absent. (Marine & fresh water.) 



CHRO'lADOROIDEA Stek. & Coninck, 1933 P. 90 



Cuticle not punctate, glandular tube setae present or absent; helmet 

 usually present. (Practically all marine) 

 DESfiODOROIDEA Steiner, 1927 P. 97 



