Tylenchorhynchus magnicauda (Thorne, 1935) Filipjev, 1936

P. A. A. LOOF, 1971, FREELIVING AND PLANT PARASITIC NEMATODES FROM SPITZBERGEN, COLLECTED BY MR. H. VAN ROSSEN, Mededelingen Landbouwhogeschool Wageningen 71, pp. 1-86 : 41

Tylenchorhynchus magnicauda (Thorne, 1935) Filipjev, 1936

( Fig. 10 ).

Dimensions of nine females: L = 0.68-0.92 mm; a = 25-30; b =4.0-4.7; c = 15-18; V = 19" 27 57- 6 1 21 - 28; spear = 25- 28 \i.

These specimens differ in some minor details from the original description. The excretory pore lies more anterior, viz. opposite the posterior part of the isthmus. The phasmids lie also more anterior, 43 % (38 -55) of tail length from the anus. Contrary to Allen's (1955) illustration the cuticle of the terminus is strongly thickened.

Tail 2. 1-2.8 anal body widths long, with 34-42 annules. Median bulb located at 46-48 % of neck length from head end. Terminal bulb very long, slightly overlapping. The large dorsal gland nucleus lies close to the base of the bulb. Vulva a transverse slit 11 (JL long. Male not found, female gonads without sperm. Body straight in death.

This species is strongly reminiscent of the genus Pratylenchoides through shape of lip region, stout spear with very heavy basal knobs, posterior position of vulva, and cylindroid tail with broadly rounded, annulated terminus. So far it has been known only from the Rocky Mountains, U.S.A.

Samples 18, 26, 56 and 66.

Figures

FIG. 10. Tylenchorhynchus magnicauda(Thome),female. A: neck region; B: tail.