Tylencholaimus cosmos ( Dhanam & Jairajpuri, 1999 )

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 : 73-76

Tylencholaimus cosmos ( Dhanam & Jairajpuri, 1999)

Fig. 6 , Table 5

Amphitylencholaimus cosmos Dhanam & Jairajpuri, 1999: 2 , 4

Tylencholaimus cosmos – Peña-Santiago 2008: 120–121.

Material examined

INDIA – Goa State • 3 ♀♀; South Goa district, Verna ; 15º35.3′59.3″ N, 73º92.2′26.4″ E; 5–15 cm depth; 22 Apr. 2016; soil sample collected from around the roots of grasses (unidentified); slide reference number AMU/ZD/NC/ Tylencholaimus cosmos /1 . – Kerala State • 3 ♀♀; Thiruvananthapuram district, Ponmudi hill; 8º45′36.2″ N, 77º07′08.2″ E; 5–15 cm depth; 4 Nov. 2017; soil sample collected from around the roots of grasses (unidentified); slide reference number AMU/ZD/NC/ Tylencholaimus cosmos /2 .

Remarks

Dhanam & Jairajpuri (1999) described Amphitylencholaimus cosmos from Malnad tracts of Karnataka, India. Peña-Santiago (2008) did not accept the generic status of Amphitylencholaimus and transferred A. cosmos to Tylencholaimus . Ahad & Ahmad (2016) reported this species from Kaziranga National Park, Assam, India. Dhanam & Jairajpuri (1999) characterized this species by having the anterior slender part of pharynx expanding gradually to form the cylindroid basal part but in their fig. 1C, the anterior part of pharynx appears slender, expanding abruptly to form the basal expanded part. In the present specimens, the anterior part of pharynx is also slender, expanding abruptly to form the basal expanded part. The morphometrics of the present populations conform well with the type population except in having a shorter body length (0.55–0.76 vs 0.7–0.9 mm), slightly lower b value (3.1–4.2 vs 3.9–5.0) and shorter odontophore length (8.5–10 vs 12–14 μm). The present populations also conform well with the Assam population except in having a slightly higher lip region (3.0–3.5 vs 2.0–3.0 μm) and a longer rectum (17–22 vs 13–14 μm).

Figures

Fig. 6. Tylencholaimus cosmos(Dhanam & Jairajpuri, 1999), ♀ (LM photographs). A–B.Anterior region. C. Anterior region showing amphid. D. Pharyngeal region. E. Expanded part of pharynx. F–G. Genital system. H. Vulval region. I–J. Posterior region. K. Posterior end. Scale bars: A–C, E–K = 10 μm; D = 20 μm.