Monhystera vulgaris de Man, 1880.

Many representatives were found of the filiformis-vulgaris complex. These two species are difficult to separate; Wieser in his list of species (1956) does not mention M.vulgaris; Micoletzky (1925) suggests that these species may be variants of a single species. The Spitzbergen material falls into two groups. The first has the amphids 1.0-1.6 head widths from the anterior body end and is here regarded as M. vulgaris. Dimensions of 23 females: L = 0.33-0.64 mm; a = 19-27; b = 4.7-6.9; c = 3.4 -4.3; V = 23 ~ "56 - 61. Diameter of amphids 2.0-2.5 [i. or 18-20 % of the corresponding body width. The tail measures 8 -10 anal body diameters. Vulva-anus distance is 48- 65 % of tail length. Dimensions of two intra-uterine eggs: 38 -42 x 14-16 y..

Samples 5, 8, 27 and 65.