Tylencholaimus teres Thorne, 1939

Islam, Md Niraul & Ahmad, Wasim, 2021, Five new and five known species of the genus Tylencholaimus de Man, 1876 (Nematoda: Dorylaimida: Tylencholaimoidea) from Western Ghats of India, European Journal of Taxonomy 774 (1), pp. 58-105 : 65

Tylencholaimus teres Thorne, 1939

Fig. 3 , Table 2

Tylencholaimus teres Thorne, 1939: 58–59 .

Tylencholaimus teres – Jairajpuri 1965: 512. — Thorne 1974: 83. — Vinciguerra 1986: 112. — Peña- Santiago & Coomans 1994a: 59–66.

Material examined

INDIA • 1 ♀, 1 ♂; Kerala State, Palakkad district, Mukkali ; 11º03′41.4″ N, 76º32′23.9″ E; 5–15 cm depth; 25 Oct. 2017; soil samples collected from around roots of shrubs (unidentified); slide reference number AMU/ZD/NC/ Tylencholaimus teres /1 .

Remarks

Thorne (1939) described Tylencholaimus teres from the USA. Later, Jairajpuri (1965), Vinciguerra (1986) and Thorne (1974) redescribed this species from India, Italy and the USA, respectively. Peña- Santiago & Coomans (1994a), in their revision of the genus Tylencholaimus , restudied the type material and added two more populations from Spain. The morphometrics of the present specimens conform well with the type population except in having a slightly shorter body length (0.78 vs 0.88–1.0 mm); shorter pharyngeal expansion (76 vs 102–110 μm); slightly anterior vulva position (V = 55.6 vs 58.8–62.3); lower c (44.7 vs 55–67) ratio and smaller spicules (28 vs 30–32 μm). The present specimens also conform well with the Indian population except in having a slightly shorter and slender body (0.78 vs 0.9 mm, a = 30.9 vs 25) and lower c (44.7 vs 50) ratio. The present specimens also conform well with Spanish populations except for having a slightly smaller pharynx (184 vs 191–228 μm) and comparatively anterior vulva position (V = 55.6 vs 62–66). These differences are considered here as intraspecific variability.

Figures

Fig. 3. Tylencholaimus teres Thorne, 1939 (LM photographs). A. Female anterior region. B. Female anterior region showing amphid. C. Male pharyngeal region. D. Male expanded part of pharynx. E. Vulval region. F. Female genital system. G. Female posterior region. H. Female posterior end. I. Male posterior region. J. Male posterior end. Scale bars: A–B, D–E, H–J = 10 μm; C, F–G = 20 μm.