Longior longior

Female. Body long and relatively slender. Cervical cuticle without spines. Subcuticular longitudinal striae present. Lateral alae well developed, arising from about two body widths posterior to the basal bulb up to the level of the anus. Head rounded, set-off from body by a single, deep groove, bearing eight prominent, paired papillae. First cephalic annule slightly inflated, about 2 to 2.5 head-lengths long. Stoma long, slender, about 3.5 first cephalic annule lengths long, surrounded by an esophageal collar. Oesophagus consisting of a very elongated, subcylindrical, muscular procorpus less set-off from the isthmus. Basal bulb sub-spherical, valve plate well developed. Intestine simple, sub-rectilinear, its fore region slightly inflated. Rectum short, anus not prominent. Nerve ring encircling procorpus at about 20% of its length. Excretory pore located at about a body width posterior to basal bulb. Vulva a median transverse slit, near midbody, lips not prominent. Vagina muscular, strongly developed, forwardly directed. Genital tract monodelphic-prodelphic. Ovary reflected at about two body widths posterior to bulb, distal flexure about two body widths long. Eggs ovoid, with eight, rough, very prominent, longitudinal ridges not reaching the poles. Oocytes in a single row. Tail conical, subulate, ending in a fine tip. Male. Body comparatively stout, shorter than female. Posterior region of body ventrally curved. Cervical cuticle unarmed, visibly annulated up to a little distance before the nerve ring. Sub-cuticular longitudinal striae present. Head set off from body by a single groove and bearing eight small, paired papillae. First cephalic annule not conspicuous. Stoma long, surrounded by an esophageal collar. Oesophagus slightly sub-fusiform, diminishing its diameter toward its second half until equaling the diameter of the isthmus. Basal bulb rounded, valve plate developed. Nerve ring encircling procorpus at about 35% of its length. Excretory pore situated at little more than a body-width posterior to basal bulb. Testis single, full of spermatids, commencing at about 1.5 body-widths posterior to bulb. Spicule absent. A large, median, mammiform precloacal papillae situated at a little less than a body width before the posterior end. A pair of dorso-lateral precloacal papillae located at about 0.5 body-widths before the tail tip. Dorsal cuticle of posterior end thickened from level of the latter pair of papillae to the tail tip. There is a cuticular bursa-like structure in the tail end, almost reaching the level of the tail tip.