NO. 2131. NEMATODE PARASITES OF RODENTS— HALL. 39 



Superfamily ASCAROIDEA Railliet and Henry, 1915. 



Synonym. — ^Ascaridea Diesing, 1861, of Travassos, 1914«. 



/Superfamily diagnosis. — Nematoda (p. 4) : Mouth commonly pro- 

 vided with two or three prominent or inconspicuous lips which are 

 often supplied with papillae, but the mouth may be of variable shape 

 and without lips. When three lips are present one is median and 

 dorsal, the others are submedian and are approximated in the ventral 

 line. Buccal capsule is not present. Males are provided with one or 

 two spicules, rarely with none. Female with two ovaries, oviparous, 

 rarely, as in Oxyuris vivipa?'a, viviparous. As a rule development is 

 direct and without intermediate host; exceptionally (as in ascarids 

 of fish) there is an intermediate host. 



Type-family. — Ascaridae Cobbold, 1864. 



Travasssos (1914«^) proposes the name Ascaridea as a superfamily. 

 This name was used as a family name by Diesing (1861) , but it is not 

 in the forni of either the family or superfamily name. 



ANALYTICAL KEY TO FAMILIES OF ASCAROIDEA. 



1. Meromyarian. Males with 1 spicule, at times reduced, imperfectly chitin- 



ized or absent Oxyuridae, p. 65. 



Polymyarian ; or meromyarian with 2 spicules 2. 



2. Meromyarian with 2 spicules Family uncertain, p. 105. 



Polymyarian 3. 



3. Lips 8 or 6 in number and very prominent. No anal sucker in male. 



Ascaridae, p. 39. 



Lips 2 or 3 or none present, mouth variable in shape. Anal sucker in male 



or rarely (Seuratum) absent Heterakidae, p. 44. 



Family ASCARIDAE Cobbold, 1864. 



Family diagnosis. — Ascaroidea (p. 39) : Polymyarian, mouth 

 with three prominent lips supplied with papillae, the dorsal lip being 

 median and the two others submedian and approximated in the ven- 

 tral line, or with three main lips and three relatively prominent or in- 

 conspicuous intermediate lips (interlabia). Male usually with two 

 spicules. Caudal extremity of female terminates conically and fairly 

 abruptly. 



Type-genus. — Ascaris Linnaeus, 1758. 



SiabfaiTiny ASC-A.R,INA.E Travassos, 1913. 



Suhfa/mily diagnosis. — Ascaridae (p. 39) : Characters of the 

 family. 



Type-genus. — Asca7^is Linnaeus, 1758. 



ANALYTICAL KEY TO GENERA OF ASCARINAE. 



1. Lips without fringes or tentacles Ascaris, p. 40. 



Lips with fringes or tentacles Crossophorus, p. 42. 



