Paras. Fi3 



A KFY TO THE GENERA AND SPECIES OF SPIRllL NEMATODES 

 (From Golden, 1955) 



1. Opening of dorsal esophageal gland usually less than 1/3 of 

 stylet length from base of styletj phasmids either small, 

 dot-like or large, round -or oval structures (scutellum). 



Rotylenchus Filipjev, 193h h 



Opening of aorsal esophageal gland 1/3 or more of stylet 

 length from base of styletj phasmids always small, dot-like 

 structures. Helico tylenchus Steiner_, 19U5 2 



2. Tail generally rounded; stylet approximately 22 y. 



H. multicinctus (Cobb, 1893) n. comb. 



Tail not rounded, with most of the curvature being on the 



dorsal side; stylet about 25-28 yi. 3 



3. Tail usually with long ventral terminal process; well-developed 

 spherical spermatheca present. 



H. erythrinae (Zinmermann, 190li) n. comb. 



Tail with or without short, bl\int ventral terminal process; 

 well-developed spherical spermatheca absent. 



H. nannus Steiner, 19U5 



U. Phasmids large, round or oval structures ( scutelltan) . 7 



Phasmids small, dot-like structures. 5 



5. Tail with distinct ventral terminal process; stylet 23-25 y. 



R. melancholicus Lordello, 1955 



Tail without a ventral terminal process; stylet 28 y or over. 6 



6. Phasmids at about latitude of anus; stylet approximately 28 y. 



R. robustus (de Man, 1880) Filipjev, 19i;5 



Phasmids well forward of anus; stylet about 33 V-- 



R. buxophilus n.sp. 



7. Phasmids not opposite each other, location of anterior one being 

 at average of 79^ of body length and posterior one at an average 

 of 86^; lips of vulva protruding. 



R. christiei Golden and Taylor, 1956 



