I6h. 



Genus Trichodorus Cobb, 1913 

 (Key to the species from Allen, 1957) 



1. Females with one ovary (monodelpliic) monohystera Allen, 19^7 



Females with two ovaries (amphidelphic) 2 



2. Spear more than 130 microns long elegans Allen, 19'?7 



Spear less than 110 microns long 3 



3. Fjccretory pore posterior to base of the esophagus; spear less than 30 



microns long; males not known nanus Allen, 1957 



Excretory pore anterior to end of esophagus; spear more than 30 

 microns long; males knovm h 



U. Females with ventro-median or ventro-submedian pores near vulva; males 



with 2 or 3 supolementary papillae 5 



Females without ventro-median or ventro-submedian pores near vulva; 

 males with 1 or 3 supplementary paoillae 6 



5. Females with ventro-median pores, 2 anterior and 2 posterior to the 

 vulva; male vjith caudal alae, 2 supolementary papillae 



porosus Allen, 1957 



Females with 2 ventro-submedian pores posterior to the irulva; male 

 with caudal alae, 3 supplementary papillae. . . atlanticus Allen, 1957 



6. Females without caudal oores or lateral hypodermal pores; males with 

 a single supplementary oapilla, caudal alae present 



christiei Allen, 1957 



Females with one lateral hy-oodermal oores; males with or without 

 caudal alae, more than one ventral supplement 7 



7. Females with three lateral hypodermal pores posterior to vulva; males 

 with caudal alae and three ventrs^l supplements 



pachydermus Seinhorst, 195U 



Females with one lateral hypodeimal pore posterior to vulva; males 

 without caudal alae 8 



8. Females with thre? lateral hypoderm.al pores, 2 anterior and one oost- 

 erior to vulva; males vjith 3 or U ventro-median papillae anterior to 



excretory oore pririitivus (de Man, 1880) Micoletzky, 1922 



Females with not more than two lateral hypodermal pores; males with 



. 0-2 ventro-median papillae anterior to excretory pore 9 



9. Females with one lateral hypodermal pore posterior and one anterior 

 to vulva; 1st supplement in male about opposite proximal end of 

 spicules 10 



Females with one lateral hypodermal pore at level of vulva; males with 

 1st supplement near distal end of spicules 11 



