9^. 



11. Accessory piece reduced to a small rectanrmlar plate 



. ... o ..». o »,...,.. . Paraseuratiella Stekhoven, 1950 

 Accessory piece not reduced to a snail rectangular plate. ..... 12 



12. Accessory piece proximally impaired, shaped as in Cyatholaimus 

 ....»=,»<.....,.,.,. Praeacanthonchus Micoletzky, 192U 

 Accessory piece proximally paired .... Paracanthonchus Micol., 192U 



13. Tooth and lateral differentiation absent. . . Seuratiella (Ditl., 1921) 

 Tooth and lateral differentiation present , . . Acanthonchus Cobb, 1920 



II4.. Supplements mostly absent, sometimes present in form of minute 



papillose bodies which are neither sucker-like not setose or tuljtlar; 



tail always elongate spicula simple ... 15 



No supplements; tail not elongate I6 



15. Esophageal bulb absent; lateral differentiation of cuticle mostly 



irregular . . Longi cyatholaimus Micoletzky, 192U 



Esophageal bulb present; lateral differentiation regular in 



longitudinal rows Metacyatholaimus Stekhoven, i9U2 



and Paralongicyatholairrus Stekhoven, 1950 



16. Cuticular annules resolvable into dots; no wings 



......... ..... Cyatholaimus Bastian, I8l5 



Cuticular annules without dots; 10 longitudinal win,^s present 

 ............. Xenocyatholaimus Gerlach, 1953 



Regarding Dispirella Cobb, 1933, Wieser, 195U writes, "In the 

 above key I left out Dispirella Cobb, 1933 since data are too scarce 

 as to draw definite conclusions; according to Chitwood, 1951 it should 

 be distingi'ished from other genera by the almost sphaeroid buccal 

 cavity." 



Others: (Freshwater and/or soil inhabitants): 



Achromadora Cobb, 1913 - is most closely relat-^d to Cyatholaimus, 

 differing in not possessing cuticular pores. 



Prodesmodora Micoletzky, 1923 - keys to Heterocyatholaim.us above, 

 but differs in having a cylindroid buccal cavity bearing 5 variously 

 placed denticles and a circular amphid. 



? Monochromadora Schneider, 1937 - doubtfully placed in the 

 Cyatholairriinae by Goodey, 1951. Amphids of doubtful position, stoma 

 without longitudinal ridges in walls, prismatic to cup-shaoed, with 

 two very small teeth. Esophagus cylindrical and ending in a valve- 

 less bulb. 



Odontolaimus de Man I88O - differing from all other genera in 

 the form of the stoma<, Stoma in two parts: a small anterior tubular 

 cavity and an elongated posterior prismatic region, An-phids lan^e, 

 circular. 



