ii. 



Suborder STRONGYLINA Raillet & Henry, 1913 

 (Key to the superfamilies modified from Chitwood, 1950) 



1. Male with well-developed bursa, rays not fusedj corona radiata present 

 or absent; stoma well-developed, reduced, rudimentary or absent . . 2 

 Male with bursa often reduced, rays somewhat fusedj corona radiata 

 absent J stoma reduced, rudimentary or absent 



....,...,..,.. MRTASTRONGYLOIDSA Lane, 1917 



e • e e o 



2, Corona radiata often present, lips absent; stoma usually well- 

 developed, subglobular. . . .STRONGYLOIDEA (Weinland, 1858) Hall, 1913 

 Corona radiata absent, 6 or 3 inconspicuous lips, or lips absent; 

 stoma reduced; rudimentary or absent; cuticle usually inflated in 

 cephalic region ...,,.,..,.. TRICHOSTRONGYLOIDEA Cram, 192? 



Suborder RHABDITINA Chitwood, 1935 

 (Key to the superfamilies from Chitwood, l950) 



1. Stoma commonly distinct, lips usually distinct; phasmids pore-like 



. .,,.,., RHABDITOIDEA Travassos, 1920 P. 5 



Stoma greatly reduced, lips rudimentary or absent; phasmids large, 

 pocket-like. (Parasites in the body cavity of earthworms) 



DRILONMATOIDEA Chit., 1950 



oooo«oo*e««ee9 



Order TYLENCHIDA Thome, 19U9 

 (Key to the superfamilies from Chitwood, 1950) 



1. Dorsal esophageal gland orifice in precoipus 



TYLENCHOIDEA (Oerley, 1880) Chit. & Chit., 1937 P. 27 



Dorsal esophageal gland orifice in metacorpus 



, , APHELENCHOIDEA (Puchs, 1937) Thome, 19U9 P. 68 



