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 Alaimus depressus n.sp. (Fig. 20). Dimensions: Female, holotype : L = 0.86 mm ; a = 44; b = 3.9; c = 12; V = 43 1 6. Female, paratype : L = 0.94 mm ; a = 46; b = 4.3; c = 13; V = 43 1 3. Body coiled into spiral shape in death. Excretory'pore 11 jx from head end. Amphidial sensillae located 51- 56 \L behind head end, or 65- 70 % of the distance from head end to nerve ring. Cuticle smooth, 1 fx thick. Oesophagus widened in posterior seventh. The nerve ring surrounds the oesophagus at 36 - 37 % of its length from head end. Gonad single, posterior. Vagina perpendicular to body axis. The outstanding feature of this species is the peculiar depression of the ventral cuticle immediately behind the vulva. Tail 7 anal body widths long, curved ventrad, terminus subdigitate. Walls of rectum heavily cuticularized. Holotype : Female on slide WT 1219. Paratype : One female (broken) on slide WT 1220. Type habitat and locality: Sample 63.