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 Plectus parvus Bastian, 1865 . Dimensions of five females : L = 0.39-0.50 mm ; a = 17-24; b = 3.5-3.9; c = 7.7- 9.4; V = 1 0 - 1451 - 538 - 12. FIG. 14. Plectus assimilis Bütschli , female. A: neck region; B: tail; C: entire specimen. FIG. 15. A-B: Plectus inquirendus Andrâssy , female. A:neck region; B: entire specimen. C-D: P.geophilus de Man , female. C: neck region; D: tail. This species is recognized easily by its straight posture in death, except the tail which is bent to the ventral side; tail length is equal to 4.3 - 5.7 anal body widths. The post-equatorial vulva position is also characteristic. Samples 7, 18, 19, 25, 31, 32, 43, 53, 55, 57/58, 62, 64, 65, 67 and 70. In sample 4 a population was found, brought provisionally to P.parvus , but the body is larger and the vulva lies equatorial. The amphids measure 20- 23 % of corresponding body width; tail length is equal to 4.0 -5.3 anal body widths. Dimensions of 16 females : L = 0.49 -0.66 mm ; a = 20-24; b = 3.6-4.2; c = 9. 1-11.8; V = 7 - 1 149 - 51 6 - 1 2.