113. 



Genus Thornia Meyl, 195U 

 (Key to the species) 



1. Female tail length 2 anal body diameters or more 2 



Female tail length less than 2 anal body diameters h 



2. Spear length equal to 60^ of the lip region width 



, . parathem ophila (Meyl, 1953) Meyl, 195U 



Spear length equal to lip region width 3 



3. Female tail length about 2 anal body diameters 



, steatopyga (Th. & Swang., 1936) Meyl, 195It 



Female tail length greater than 3 anal body diameters 

 ■ . rhopaloceroides (Schneider, 1937) Meyl, 195U 



U* Spear length 1/3 longer than lip region width 



juvenilis (de Coninck, 1935) Meyl, 195U 



Spear length equal to or less than lip region width S 



5. Spear length equal to 90-100^ of lip region width 6 



Spear length equal to 50-60^ of lip region width 7 



6. Female tail terminus clavate; basal esophageal enlargement abrupt 



propinqua (Paesler, 19Ul) Andrassy, 1957 



Fem.ale tail terminus hemispherical; basal esophageal enlargement 

 gradual ' gubemaculifera Andrassy, 1957 



7. Length 0.7 - 1.2 mm; spear aperture equaling 1/6 of spear length; 



amphid equaling 1/3 head width pithecusana Meyl, 195U 



Length 0.5 - 0.72 mm; spear aperture equaling 1/3 of spear length; 

 amphid equaling l/U hsad width 8 



8. Posterior half of spear extensions and beginning of esophageal lumen 

 encircled by a bright oval zone . . . goffarti (Meyl, 1953) Meyl, 195U 

 Bright oval zone absent from the regions mentioned above 

 thermophila (Meyl, 1953) Meyl, i95U 



The authors wish to express their appreciation for the considerable 

 aid given by Dr. Aived H, Meyl in the construction of this key. 

 Regarding T, steineri (Schneider, 1925) Andrassy, 1957, Dr. Meyl 

 considers this nema as not belonging to the genus Thornia Meyl, 195U 

 due to the presence of 3 small but distinct knobs on the spear. 



