NO. 6 CLASSIFICATION OF NEMATODES FILIPJEV 39 



Subfamily Cissophyllinae. 



Subfamily Cruziinae. 



Subfamily Ransomneminae Travassos. 



Genera: Ransoninema Artigas, 1926; Heth Cobb, 1898 (syn. Streptogaster 

 Cobb, 1898) ; Clementeia Artigas, 1930. 

 Subfamily Lepidoneminae Travassos. 



Genera: Lepidonema Cobb, 1898; Hystrignathus Leidy, 1850 (syn. Xyo 

 Cobb, 1898) ; Pulchrocephala Travassos, 1925. 



KEY TO SUBFAMILIES OF KATHLANIIDAE 



1. (8) Spicules present. 



2. (7) Esophagus long, typically developed. 



3. (6) Intestinal caecum absent. 



4. (5) Lips vi^ithout teeth and lamellae Kathlaniinae 



5. (4) Lips armed with pow^erful teeth and lamellae .. .Cissophyllinae 



6. (3) Intestinal caecum present Cruziinae 



7. (2) Esophagus with swollen medial part Ransomneminae 



8. (i) Spicules absent, some chitinous parts (Pgubernacu- 



lum) present but not evaginable; copulation by 



apposition of genital openings Lepidoneminae 



The Kathlaniidae include all genera with a sucker in the male 

 and with meromyarian musculature, our definition thus coming very 

 near to that of Baylis and Daubney (1926), and including the Cruzi- 

 idae separated by Travassos. The chief ground for separation of 

 the last is the presence of the intestinal caecum in Cruzia, but it is 

 safer to take the taxonomic characters from the more constant 

 mouth parts and male genitalia than from the parts of intestine 

 which are variable in very closely related groups. The Cissophyl- 

 linae as separated by Yorke and Maplestone (1926) are based on 

 their specialized mouth parts. Three groups from the invertebrates 

 can be included here. Oniscicola and Cmznema, with a typical de- 

 velopment of the esophagus, can be included directly in the Kath- 

 laniinae. The Ransomneminae should be separated because of the 

 peculiar development of the esophagus which is swollen in its medial 

 part. The Lepidoneminae which have lost the spicules are very 

 peculiar, but also can be classed here because of the preanal sucker 

 which is developed or at least rudimentary. 



Subfamilies and Genera of the Family Oxyuridae 

 Subfamily Oxyurinae. 



Genera: Thelastoma Leidy, 1854 (sg. Thelastomellmn Cobb, 1929; syn. 

 Bulhoesia Schwenck, 1926) ; Leidynema Schwenck, 1929; Severianoia 

 Schwenck, 1926; Cephalobellus Cobb. 1920 (syn. Blatticola Schwenck, 

 1926) ; Binema Travassos, 1925; Frotrellus Cobb, 1920; Pseudonymus 

 Diesing, 1857 (syn. Ptychocephahis Diesing, 1861 ; syn. Helicothrix 



