Morphology
All nematode stages are vermiform. Adult males and females are different in appearance (sexual dimorphism), the males having poorly developed stylets and a knob-like head caused by an elevated, constricted lip region. Both males and females have long, tapered tails with rounded or indented ends. The male has a sharp, curved spicule enclosed in a bursa, or sac. Females are between 550 and 880 µm (0.55 to 0.88 mm) in length and about 24 µm in diameter, with well-developed stylets 16 to 21 µm (average 18 µm) long. Males are smaller than females, 500 to 600 µm in length .
Read more about this topic: Radopholus Similis
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