5. 



Superfamily RHAPDITOIDEA Travassos, 1920 

 (Key to the families) 



1. Esopliagus tenriinated by a valvulated bulb 2 



Esophagus not terminated by a valvulated bulb 9 



2. Telorhabdions * absent or rudimentary 3 



Telorhabdions present it 



3. Stoma conoid, protorhabdions fused; male x^ith caudal alae 



(parasites of molluscs and amphibians) 



ANGIOSTCMATIDAE Blanchard, I896 



Stoma collapsed, protorhabdions feebly sclerotized; male without 

 caudal alae (parasites of arthropods) 

 STEINERI^JEMATIDAE Chit. & Chit., 1937 



U. Telorhabdions in the form of a glottoid apparatus 5 



Telorhabdions not in the form of a glottoid apparatus 6 



5. Monogenetic; 2 or 1 ovary (free-living and parasitic) 



. RHABDITIDAE Oerley, 1380 ^.^ 



Heterogenetic; 2 ovaries (parasitic generation in amphidians and 

 reptiles) RHABDIASIDAE Railliet, 1915 



6. Corpus elongate, metacorpus usually indistinct, sometimes faintly 



fusiform 7 



Corpus short and thick or metacorpus bulbar 8 



7. Lip region with sojc cephalic cirri, cheilorhabdions in fonii of buccal 

 hooks ("odontia" of Cobb), (free-living) 



CHA1'!BERSIELLIDAE Sanwal, 1957 P«8 



Lip region w/o si:?; cephalic cirri, cheilorhabdions not in form of 



buccal hooks (free-living) CEPHALOHIDAE Chit. 4 Chit., 193h P.lU 



8. Two lateral lips present (parasitic in gut of vertebrates) 



STRONGYLOIDIDAE Chit. & Mcintosh, I93U 



One lateral lip present (free-living or parasites of invertebrates) 

 DIPLOGASTERIDAE Steiner, 1929 P. 25 



9. Telorhabdions plate-like, stoma cylindrical 10 



Telorhabdions not plate-like 11 



10. Esophagus made up of a procorpus and metacorous blending into a 

 cylindrical muscular esophagus (free-living) 



CYLINDROCORPORIDAE Goodey, 1939 P. 3 



Esophagus without anterior swelling respresenting the corpus 



(parasite of a sluc^) (Contains a single genus and species, Agfa 

 flexilis (Dujardija 1814;) Chit^ 1935 AGFIDAE Dougherty, 1955 



11, Metacorpus indistinct, corpus elongated (free-living or consorts of 

 plants and land-dwelling invertebrates) 

 CEPHALOBIDAE Chit. & Chit., 193U P.lU 



Metacorous bulbar, or corpus short and thick (free-living or parasites 



of invertebrates) DIPLOGASTERIDAE Steiner, 1929 P. 25 



■i:- For full discussion of terrninoio;:;y, see Dou'7:ii.ei''t,y, 1.9j5. 



