Tylenchida Tylenchina Tylenchoidea Dolichodoridae Dolichodorinae
Large, slender nematodes with cylindroid bodies.
No secondary sexual dimorphism.
Cuticle distinctly annulated, lateral field with three or four incisures.
Labial region distinctly off-set and annulated (rarely smooth).
Labial sclerotization strong, with very thick basal plate and thick arches.
Amphid apertures small slits laterally or dorso-ventrally directed.
Female tail rounded to hemispherical with spike-like extension, rarely elongate-conoid.
Females with two genital branches, columned uterus with four rows of cells; vagina very heavily sclerotized.
Male caudal alae wing-like and tri-lobed.
Stylet well developed up to 150 Ám.; cone markedly longer than shaft.
Esophagus with amalgamated pro-metacorpus, short isthmus and pyriform glandular region not overlapping the intestine.
Obligate migratory ectoparasites of plant roots.
[Ref: Luc & Fortuner, Rev. Nematol. 10(2):177-181 (1987), and H. Ferris.]