Dorylaimellus hopedorus, Thorne, 1929

Thorne, Gerald, 1929, Nematodes from the Summit of Long's Peak, Colorado, Transactions of the American Microscopical Society 48 (2), pp. 181-181 : 187-188

Dorylaimellus hopedorus n. sp.

Diagnosis:

This species differs from Dorylaimellus virginianus the type, and only species described, in that the basal third of the spear is made up of six sections. Fig. 8 b. The short hemispherical tail is very different from the conoid tail of the type species.

The body is marked by excessively fine striae. There are no wings. The convex-conoid neck ends in a slightly set off lip region bearing two circlets of low innervated papillae. The broad amphids are stirrup-form with deep inner extensions leading to sensilla pouches. Fig. 8 a. The spear is of three parts——the anterior a cylindrical, straight, heavily cutinized section twice as long as the width of the lip region, a second cylindrical less cutinized part five-eights as long as the first and a basal portion as long as the second part but only slightly cutinized. When viewed in cross section this basal portion is found to be made up of six sections. Fig. 8 b. The esophagus is slightly narrowed at first then expands in an elongate bulb followed by a tube about one-third the neck width that suddenly expands near the middle to form the basal portion which is three-fifths as wide as the neck. The conoid cardia is one-fifth the body width and submerged in the intestine. The intestine is about four cells in circumference and often is green in color, doubtless due to the vegetable matter on which the nema feeds. From the depressed vulva the cutinized vagina leads half way across the body. The two symmetrical ovaries are reflexed half their length the front being on the right, the rear on the left, side of the body. The eggs are one and one-half times as long as the body width and one third as wide as long. As many as four may occur at one time. From the slightly depressed anus the rectum leads forward, being about one anal body diameter in length. The prerectum is about three times as long as the rectum. Pores lie somewhat past the middle of the tail. Fig. 8 a-c.

Very numerous in the collections. This may be related to Dorylaimus macrodorus deMan .

This species is placed in Dorylaimellus only tentatively. A study is being made of this and several other related species and it may be necessary to establish a new genus to receive them.

Figures

Dorylaimellus hopedorus n. sp.

Fig. 8 a-c.