FREELIVING AND PLANT PARASITIC NEMATODES FROM SPITZBERGEN, COLLECTED BY MR. H. VAN ROSSEN Author P. A. A. LOOF Department of Hematology, Agricultural University, Wageningen, The Netherlands text Mededelingen Landbouwhogeschool Wageningen 1971 1971-12-31 71 1 86 journal article 10.5281/zenodo.8152982 dc936e39-ea56-4501-b5ba-a24d055276c8 8152982 85C9CB49-EEA1-467B-ACC7-7C11B9EDEEAD Tylencholaimus proximus Thorne, 1939 ( Fig. 30 ). Dimensions: Females (n = 22): L = 0.59 mm (0.45 -0.71); a = 18 -24; b = 3. 1-4.4; c = 23 - 3 1; V = " - 2 66 3 - 68. Male (n = 1): L = 0.56 mm ; a = 24; b = 3.2; c = 27; VD = ^ó11. Body nearly straight in death. Lip region offset by constriction, cap-like, the inner papillae protruding distinctly. Outer layer of cuticle smooth, inner with fine transverse striae and in mounted specimens somewhat irregularly wrinkled and loosened from outer layer. Oesophagus widened gradually at about 60 % of its length from head end. Length of odontostyle 6 -7 \L, of basal portion 8 -10 \L. In some females a very short posterior uterine sac appears to be present. Tail symmetrically conoid in the female, with broadly rounded tip: its length 0.9-1.3 anal body widths. Rectum about as long as anal body width, prerectum thrice as long. No sperm in gonad. Male body curved ventrad in posterior third. Testes two, dorylaimid, but possibly non-functional, as no sperm is present. Spicules dorylaimid, 28 jx long (along axis). Apart from the adanal pair there is a series of two ventromedian supplements, spaced 13 \x apart, the posterior one 42 \ ior two tail lengths from the anus. Tail dorsally conoid, tip round, less blunt than in the female. Lateral guiding pieces not seen. FIG. 30. Tylencholaimus proximus Thome , male tail. Samples 17, 18, 25, 26, 38, 52 and 62; the male in sample 18.