Systematics of the genus Tylolaimophorus de Man, 1880 (Nematoda Diphtherophoridae), with description of T. minor (Thorne, 1939) Goodey, 1963 from Iran Author Ghaderi, Reza Author Asghari, Ramezan Author Eskandari, Ali text Zootaxa 2020 2020-03-24 4755 2 322 340 journal article 10.11646/zootaxa.4755.2.7 c6ae3424-0cb2-4be5-8b64-510468c9b86a 1175-5334 3733635 urn:lsid:zoobank.org:pub:321C36EA-3A65-4C43-80AE-5D2C536D2DF9 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 ).