Pratylenchus Species Key
[Click on to see Picture Comparisons of characters]
19. Stylet knobs slightly cupped and rounded posteriorly; body striae coarse, about 1.7 um apart at midbody; esophageal lobes elongate, less than twice body width 
P. agilis Thorne & Malek, 1968 
19. Stylet knobs tulip-shaped which are narrow and high; body striae fine, less than 1 um apart at midbody; long isthmus and unusually elongate esophageal lobe three times body width
P. tenuis Thorne & Malek, 1968
20. Lip region high, body striae fine, about 1.2 um apart at midbody; posterior uterine branch about equal to body width at vulva; tail conoid to broad 
P. scribneriSteiner, 1943
20. Lip region low; body striae fine, less than 1 um apart at midbody; posterior uterine branch less than one body width at vulva; tail cylindrical
P. crassi Das & Sultana, 1979
21. Tail terminus crenate or with a distinct sub-ventral or terminal projection 
 ................22
21. Tail terminus smooth
.................32
22. Males unknown; spermatheca without sperm 
...................23
22. Males common; spermatheca with sperm  ...................24
23. Vulva at 69 - 78%; lateral field with six lines ; body annulation fine 
P. teres Khan & Singh, 1975
23. Vulva at 80 - 86%; lateral field with four lines ; annulation prominent 
 P. crenatusLoof, 1960
24. Spermatheca large, elongate 
..................25
24. Spermatheca round, square, or broadly oval to rectangular ..................26