Tylolaimophorus cavicaudatus Eroshenko & Tepljakov, 1977

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 : 326-327

Tylolaimophorus cavicaudatus Eroshenko & Tepljakov, 1977

After Eroshenko & Tepljakov (1977)

MEASUREMENTS

Holotype female: L = 1.11 mm; a = 25; b = 7.7; body width = (44) µm; spear = 15 µm; pharynx = (145) µm; tail = (38) µm; c = 29; c’ = (1.2); V = 63.

1 paratype male: L = 0.73 mm; a = 20; b = 5.8; body width = (36) µm; spear = 15 µm; pharynx = (125) µm; tail

= (30) µm; c = 24; c’ = (1.2); spicules = 21 µm; gubernaculum = 5 µm.

DESCRIPTION

Female. Body medium-sized and cylindrical. Cuticle with very thin transverse striation. Lip region conical, continuous with the body contour. Amphids cup-shaped, at the base of lip region. Spear slender. Pharynx with a slender anterior part and an oval basal bulb, and a distinct, three-celled cardium. Secretory-excretory pore on the level of the anterior end of the basal bulb. Gonads paired, ovaries reflexed. Vagina weakly sclerotized, one-third of the vulval body diameter. Spermatheca round, filled with spermatozoa. Intestine with no obvious post-rectal sac. Tail plump, conical, with a bluntly rounded terminus.

Male. Smaller than female. Spicules short, slightly curved. Gubernaculum distally thickened. Supplements present: four anterior to cloaca and one posterior to it. Tail similar to that of the female.

DIAGNOSIS AND RELATIONSHIPS

Tylolaimophorus cavicaudatus has been differentiated from T. pugio by tail shape, the absence of a post-rectal sac and the different structure of the spicules. It has a longer pharynx (b = 7.7 vs 8.6-12.0), more posterior vulva position (63 vs 48-57), shorter spicules (21 vs 30-40 µm), different musculature, and a post-cloacal supplement. Brzeski (1994) stated that the descriptions of T. cavicaudatus and T. corpulentus do not provide sufficient bases for species separation. He also noted that the differences in body width may be an effect of flattening for T. corpulentus ; thus, these two taxa may be conspecific.

DISTRIBUTION

Described from the rhizosphere of Korean pine ( Pinus koraiensis Sieb. et Zucc. ) in Chuguevsky district of Primorsky Krai, Russia ( Eroshenko & Tepljakov 1977).