126. 



Subfamily NYG0LA3MINAE Thorne, 1935 

 (Key to the genera modified from Thorne, 1939) 



1. Esophagus with definitely set off basal portion . , . , 2 



Esophagus without set off basal portion (cylindrical) , 3 



2. Tooth ventral submedian O3oo..o<,,.oo . Nygolaimus Cobb, 1913 P-l?? 

 Tooth ventral «.oo.o,».»oc.o»,, Sectonema Thorne, 1930 * 



J • \JvaXj oris e«««eoo«o«Q««09i>oso»900»aai««u IX 



Ovaries two ,..»... o.. o ... » Bathyodontus Fielding, 19^0 P. 126 



U. Lips six «.€.<.......,. Oionchus Cobb, 1913 



(Monotypic 0. obtusus Cobb, 1913) 

 Lips three ........... c.... Enoplocheilus Kreis, 1932 



(Monotypic E. obtusicaudatus Kreis, 1932) 



* To date two species of Sectonema have been described: S. 

 ventralis Thome, 1930 and S. rotundicauda Goodey, 19^1 a S. 

 ventralis was described from females while S. rotundicauda is repre- 

 sented by a single male specimen. Regarding the differences between 

 the two species Goodey, 1951 writes relative to S. rotundicauda ; 

 "differing from S. ventral in the lips being less angiilar and more 

 founded in outline, in the tooth being rather more developed, in the 

 tail being shorter and more hemispherical in outline and in the 

 sparseness of the lateral pores." 



The genus Mirolaimus Andrassy, 1956 is a synonym of Bathy- 

 odontus Fielding, 1950. (Andrassy, personal communication) 



Genus Bathyodontus Fielding, 1950 

 (Key to the species) 



1. Length 1.1 mm, tail with one pair of caudal papillae 



...... ..... cylindricus Fielding, 1950 



Length 0.7 - 0,86 mm, tail with two pairs of caudal papillae 

 miirus (Andrassy, 1956) Andrassy, unpublished 



