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 Eudorylaimus maksymovi Altherr, 1963 ( Fig. 28 ; Diagram 7). Two females. Dimensions: L = 1.69-1.83 mm ; a = 36 - 40; b = 4.1-4.3; c = 17-19; V = 9 44 - 469. FIG. 27. Eudorylaimus vanrosseni n.sp. ,female.A: head end; B: oesophagus base; C: vulva; D: tail; E: entire specimen. Cuticle thin, 2.5 -3.0 jx; transverse striation very fine. Outer layer thin, sharply demarcated. Lip region offset by a shallow depression; the inner circle of papillae located rather far outward. Length of odontostyle 20 [x or 1.3 x width of lip region, the aperture occupying one-third of its length. Oesophageal characters: The oesophagus begins to widen at 48 % and attains its full width at 58- 60 % of its length from head end. DO lies slightly behind the latter level, the distance DO- DN is 20 fx. The SJM lie a small distance apart; the anterior one is small and indistinct. S2N well developed. Locations: 7 Eudorylaimus maksymovi 9 DO 60- 6 1 %; SiN, 78 -79 %; S2N 89 -91 %; K = 78 -86; D N 65- 66 %; SjN2 81- 82 %; S20 91- 92 %; K' = 83 -89. DO- DN 4.9- 5.0 %; dist. 2.3- 3.5 %; Cardia conoid, 18 (x long. In both specimens there is an elongate organ in the posterior part of the neck, extending to just past the end of the oesophagus; located laterally on the right side. Anteriad the organ soon becomes indistinct; it might be connected with the lateral chord. Vulva depressed, transverse; vagina distinctly sclerotized. Gonads two, opposed, reflexed, with sphincter. No sperm. Tail length equal to 3.7- 3.8 anal body widths; tail conoid the distal half curved to ventral side; in the proximal half there are some saccate bodies in the cuticle ventrally and subventrally. Rectum 1.2-1.3 anal body widths long, prerectum 1.3-1.8 as long as rectum. Sample 69. These specimens correspond well to Altherr's description. The species resembles E. consobrinus (de Man, 1917) but differs from it by the transverse vulva, the longer odontostyle (against 15-16 y.) and the slightly offset lip region (continuous in the type specimen of consobrinus in de Man's collection).