NO. 6 CLASSIFICATION OF NEMATODES FILIPJEV 21 



lolaimus de Man, 1922; Antomicron Cobb, 1920; Mastodex Steiner, 

 1921 ; Aculeonchus Kreis, 1928; Heterodesmodora Micoletzky, 1924; 

 Stilbonema Cobb, 1920; Laxonema Cobb, 1920; Leptonemella Cobb, 

 1920; Croconema Cobb, 1920; Metachromadora Filipjev, 1918 (syn. 

 Chroniadoropsis Filipjev, 1918) ; Xanthodora Cobb, 1920; Onyx Cobb, 

 1891 ; Acanthopharynx Marion, 1870; Cinctonema Cobb, 1920; Chro- 

 maspirina Filipjev, 1918 (syn. Mesodorus Cobb, 1920) ; Polysigma 

 Cobb, 1920; Laxus Cobb, 1893; Parathalassoalaimus Allgen, 1929; 

 Catanema Cobb, 1920; Spirina Filipjev, 1918 (syn. Spira Bastian, 

 1865, preocc.). 



Subfamily Monoposthiinae. 



Genera: Monoposthia de Man, 1889; Xenolaimus Cobb, 1920; Dasynema 

 Cobb, 1920; Niidora Cobb, 1920; Rhinema Cobb, 1920; fCeramonema 

 Cobb, 1920 (syn. Steineria Filipjev, 1922, preocc.). 



Subfamily Epsilonematinae. 



Genera: Prochaetosoma Baylis and Daubney, 1926 (syn. Rhabdogaster 

 Metchnikov, 1867, preocc.) ; Epsilonema Steiner, 1926; Metepsilo- 

 nenia Steiner, 1926. 



Subfamily Draconematinae. 



Genera: Notochaetosoma Irwin-Smith, 1918; Draconema Cobb, 1913; 

 Tristicochaeta Panceri, 1876; Claparediella, nom. nov. (Chaetosoma 

 Claparede, 1863, preocc). 



KEY TO THE SUBFAMILIES OF CHROMADORIDAE 



1. (8) The cuticular rings with inner spots or dots or 



short external setae. 



2. (7) Amphids located at some distance from the head 



end, well developed, spiral or roundish. Esopha- 

 gus usually strong and without bulb. 



3. (6) Cuticle without setae, except the ordinary setae; 



the annules not prominent. 



4. (5) Mouth capsule typical, preceded by a folded vesti- 



bulum and with a dorsal onchium Cyatholaiminae 



5. (4) Mouth capsule atypical, very differently built up, 



with peculiar plates, bristles, jaws, etc., serving 

 for retaining prey. Mostly rapacious marine 

 forms Choanolaiminae 



6. (3) Cuticle with numerous short setae; body very 



short Richtersiinae 



7. (2) Amphids located close to the head end, in some 



genera obsolete, in form of a transverse slit. 

 Cuticular rings sharply differentiated. Esopha- 

 gus usually with a well-developed bulb. Mostly 

 small forms Chromadorinae 



8. (i) The cuticular annules smooth. 



9. (12) Without adhesive setae. 



10. (11) Without any longitudinal, cuticular crests (except 



lateral wings in some) Desmodorinae 



