Monhystera cf. dispar Bastian, 1865

P. A. A. LOOF, 1971, FREELIVING AND PLANT PARASITIC NEMATODES FROM SPITZBERGEN, COLLECTED BY MR. H. VAN ROSSEN, Mededelingen Landbouwhogeschool Wageningen 71, pp. 1-86 : 56

Monhystera cf. dispar Bastian, 1865 .

Two females. Dimensions: L = 0.57-0.61 mm; a = 22-25; b = 5.2- 5.9; c = 5.6- 5.9; V = 33 - 3659 -60.

The amphids measure 2.5;x or 20-25 % of the corresponding body diameter; they are located 1.6-2.0 head widths from the anterior end. Cephalic setae very short. Width of head slightly more than one-third of body width at base of oesophagus. The head is devoid of lips. The oesophagus is widened slightly distally. The tail measures 5.8- 6.5 anal body widths; it is conoid in the anterior half, cylindroid in the posterior. Anus and vulva inconspicuous, the lips not protruding. Rectum two-thirds of anal body width. Vulva-anus distance equal to 121-142 % of tail length. In the anterior part of the gonad the oocytes are arranged into multiple rows. The identity of these specimens is not quite certain: the head is not conspicuously broad, the amphids lie too far backward. Amphid size is controversial in this species: 13 % of corresponding body width after de Man (1884), 40- 50 % after Wieser (1956).

Sample 22.