Dorylaimus vesuvianus, Cobb, Nathan Augustus, 1893

Cobb, Nathan Augustus, 1893, Nematodes, mostly Australian and Fijian, Zootaxa 4878 (3), pp. 294-299 : 294

8. D. Vesuvianus , n. sp.

In the posterior part the neck is nearly cylindrical, but the anterior third is convex-conoid to the truncate head. The lip-region is not conspicuous, and the lips are either absent or very indistinct. There are perhaps two rows of papillae, six in each row. The spear is very slender and can be traced backward only for a distance equalling one-fiftieth of the length of the worm. The anterior part of the oesophagus is only about one-fourth as wide as the corresponding part of the neck, but it expands suddenly behind the middle, so that the posterior third (male) or two-fifths (female) is twice as wide, i. e., about half as wide as the base of the neck. The intestine is about half as wide as the body and is marked off from the oesophagus by a distinct constriction. The cardia is broad but not deep. The rectum is only three-fourths as long as the anal body-diameter; the pre-reotal portion of the intestine, however, is quite as long as the enlarged portion of the oesophagus. The lateral fields are nearly one-third as wide as the body. The tail in either sex is hemispherical or conoid-hemispherical. The inconspicuous vulva leads to a vagina half as long as the body is wide. The reflexed ovaries reach halfway back to the vulva. A ventral row row of eleven juxtaposed median innervated papillae extends forward from opposite the proximal ends of the spicula. These latter are of the usual form and about twice as long as the tail. The internal male sexual organs occupy the posterior two-thirds of the body.

Hab.Found among moss on the sides of Mount Vesuvius, Italy.

Figures

D. Vesuvianus , n. sp.