Tylolaimophorus tegmentum ( Ivanova, 1980 ) Jairajpuri & Ahmad, 1992

Ghaderi, Reza, Asghari, Ramezan & Eskandari, Ali, 2020, Systematics of the genus Tylolaimophorus de Man, 1880 (Nematoda Diphtherophoridae), with description of T. minor (Thorne, 1939) Goodey, 1963 from Iran, Zootaxa 4755 (2), pp. 322-340 : 334-335

Tylolaimophorus tegmentum ( Ivanova, 1980) Jairajpuri & Ahmad, 1992

After Ivanova (1980).

MEASUREMENTS

Holotype female: L = 0.72 mm; a = 15; b = 5.0; spear = 16.5 µm; c = 34; c’ = 0.7; V = 57.

20 paratype females: L = 0.61-0.72 mm; a = 11-17; b = 3.0-5.3; body width = (50) µm; spear = 15-17 µm; pharynx = (180) µm; tail = (20) µm; c = 25-39; c’ = 0.6-0.9; V = 51-57.

10 paratype males: L = 0.54-0.61 mm; a = 13-22; b = 3.7-4.6; body width = (35) µm; spear = 14-16 µm; pharynx = (140) µm; tail = (25) µm; c = 17-27; c’ = 0.7-1.2; spicules = 23-27 µm; gubernaculum = 5-7 µm.

DESCRIPTION

Female. Body obese, tapering to both ends. Cuticle fine, detached from body wall at the posterior end. Lip region not offset. Spear thin, with small knobs. Amphids elliptical, prominent, about half body diameter at lip base. Pharynx with thin cylindrical corpus and pear-shaped basal bulb about one-sixth of pharynx length. Excretory pore at 80 µm from anterior end. Vulva slitlike, 7-8 µm wide. Vagina short, sclerotized. Ovaries not observable. Tail shorter than the anal body diameter, cylindrical, rounded at the tip, with the terminal pore. A digitiform appendage bent on dorsal side present.

Male. Spicules short, weakly bent, cephalated, distal tips blunt. Supplements indistinct. Tail shape as in female.

DIAGNOSIS AND RELATIONSHIPS

Tylolaimophorus tegmentum has been compared with T. pugio , T. constrictus , T. digitatus , T. indicus , and T. minor . The first species, T. pugio , has a longer body (1.0-1.5 vs 0.6-0.7 mm), the lip region of T. constrictus is offset by a deep groove (vs continuous with the body contour), T. digitatus and T. indicus have conical tails (vs cylindrical) and thin rectal walls (vs thick), and T. minor differs in having a smaller spear (10-12 vs 15-17 µm) and in the absence of males (vs common presence).

DISTRIBUTION

Described from the rhizosphere of Cerasus sp. on Peter the First Mountain, Tajikistan ( Ivanova 1980).