ABSTRACT
The Hoplolaiminae sensu Fortuner include eight genera: Pararotylenchus, Rotylenchus, Scutellonema, Aorolaimus, Hoplolaimus, Helicotylenchus, Antarctylus, and Aphasmatylenchus. Some Hoplolaiminae, and particularly some species in the genera Scutellonema and Helicotylenchus, have a worldwide distribution and they are very common on many cultivated plants. Most Hoplolaiminae are found in many different plants: the list of hosts of Helicotylenchus dihystera includes grasses, rice, com, soybean, sorghum, wheat, rye, sugarcane, Cyperaceae, potato, strawberry, peanut, cotton, vegetables, trees and bushes, tea, various ornamentals, and more. Some other characters are less derived than in Hoplolaimidae, e.g., in Pratylenchidae, the tail is generally longer than two body diameters at anus, and the phasmids are situated on the tail, as in Belonolaimidae. Rotylenchulinae differs from Hoplolaiminae in having body of mature females swollen or kidney-shaped, lip region not as high as in Hoplolaiminae, glandular overlap long and mostly lateral.
