no. 



Subfamily KNCHFLTDIINAE Filipjev, I93I4 

 (Key to the genera after Wieser, 1953) 



1. Esophagus with a number of distinct bulbi . Polyg a strophora de Kan, 1922 

 Esophagus without bulbi 2 



2. Bticcal cavity narrow, almost cylindrical, transverse rin^s more or 

 less regularly arranged so as to give rise to more than two apparent 



chambers 3 



Buccal cavity of different shape, by a transverse band, rin?; or 



row of denticles divided into two unequal portions; other rings which 

 might be present are faint and concentrated at the posterior end of 

 the buccal cavity I). 



3. A transverse row of denticles in the anterior portion of the buccal 

 cavity j refractive bodies lacking 



Symplocostonnella Micol. & Kreis, 1930 



All transverse rings solid; refractive bodies present 

 Symplocostoma Bastian, 18^5 



k. Posterior portion of the buccal cavity large, asynmetrical, almost 



ventricose; refractive bodies present. . Calyptronema Marion, 1870. .5 

 Posterior portion of buccal cavity conical, sjiranetrical; refractive 

 bodies absent Conistomella Stekhoven, 19U2 



5. Lumen of esopha^ois strongly dilated; tail elongated 



Subg. Calyt-ronema s« str. 



Lumen of esophagus weakly or not at all dilated; tail conical 

 Subg, Dilaimus Filipjev, 1925 



Doubtful genera: 



Asymmetrella Cobb, 1920 

 Illium Cobb, 1920 

 Pseudodilaimus Kreis, 1928 

 Chaetonema Filipjev, 1925 

 Fenestrolainus Filipjev, 1925 



