'At. 



Subfamily CYATHOLAIMINAE Micoletzky, 1922 

 (Key to genera after Wieser, 195U) 



1. Buccal cavity reduced . . . . , Nannolainus Cobb, . . 20 



Buccal cavity well developed o..... . 2 



2. Buccal cavity deeply conoid with a small tooth projecting from the 

 ventral wall. . . . . » . . o . . . , Heterocyatholaimus Allgen, 1935 

 Buccal cavity cyathiform with dorsal tooth, or dorsal tooth plus 

 subventral teeth, or devoid of armature 3 



3. Supplements big, sucker-like, cup-shaped , 1; 



Supplements setose, tubular, minutely papillose or absent 7 



U. Supplements big, sucker-like, consisting of several elements, 



numerous; spicules simple ...<,,, , 5 



Supplements big but simple, cup-shaped, inconspicuous; spicula 

 duplex, i.e. consisting of two lists which are separated by a median 

 lacuna Biamrifer Wieser, 195U 



5. No esophageal bulb; lateral differentiation of cuticle conspicuous, 

 longitudinal rows present; buccal cavity deep; accessory piece 



complicated , 6 



Esophageal bulb or swelling present; no lateral differentiation ; 

 buccal cavity shallow with tooth absent or small; accessory piece 



simple, plate-shaped Choniolaimus Ditlevsen, 1919 



and Dispira Cobb, 1933 



6. Buccal armature consisling of bi^ dorsal tooth, two subventral teeth 

 and (always?) rows of small denticles; accessory piece not tubular 



Pomponema Cobb, 1917 



...... and Anaxonchium Cobb, 1920 



Buccal armature consisting of big dorsal tooth; accessory piece 



wholly or partly tubular. ..... Haustrifera Wieser, 195U 





7 . Supplements setose or tubular ...,...,....,, 8 



Supplements minutely papillose or absent lU 



8. Buccal armature consisting of dorsal tooth and k accessory denticles; 

 supplements setose or tubular; accessory piece dentated distally 



Metacanthonchus Wieser, 195U 



No buccal armature, or only dorsal tooth present 9 



9. Supplements setose; accessory piece weakly dilated distally, truncate 

 or notched but not dentated ..... Paracyatholaimus Micoletzky, 1921 

 Supplements tubular; accessory piece mostly dentated distally ... 10 



10. Supplements of about equal length ' 11 



Anteriormost Supplement considerably bigger than the following ones 

 ,,...,.. 13 



