Tylencholaimus micronanus Yeates, 1979

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 : 65-69

Tylencholaimus micronanus Yeates, 1979

Fig. 4 , Table 3

Tylencholaimus micronanus Yeates, 1979: 423–425 .

Tylencholaimus vanguimus Mohilal & Dhanachand, 2000: 33–35 .

Tylencholaimus micronanus – Peña-Santiago & Coomans 1994c: 362–364. — Peña-Santiago 2008: 123.

Material examined

INDIA – Kerala State • 6 ♀♀; Kasaragod district, Ranipuram National Park ; 12.4º26′18.3″ N, 75.3º58′94.4″ E; 5–15 cm depth; 15 Nov. 2016; soil samples collected from around the roots of grasses (unidentified); slides reference number AMU/ZD/NC/ Tylencholaimus micronanus /1–3 . – Karnataka State • 4 ♀♀; Kodagu district, Bhagamandala ; 12°23′29.1″ N, 75°31′50.0″ E; 5–15 cm depth; 8 Nov. 2016; soil samples collected from around the roots of grasses (unidentified); slides reference number AMU/ZD/NC/ Tylencholaimus micronanus /4–6 .

Remarks

Yeates (1979) described Tylencholaimus micronanus from New Zealand. Baqri (1991) reported it from Sikkim, India whereas, Peña-Santiago & Coomans (1994c) restudied the type material of this species and provided a complete description. Mohilal & Dhanachand (2000) described a new species, Tylencholaimus vanguimus from Manipur, India which was synonymized with T. micronanus by Peña- Santiago (2008). The morphometrics of the present populations conform well with the type population except in having a slightly shorter odontostyle (4.5–5.5 vs 6.0–7.0 μm) and in the presence of a terminal caudal pore (vs absent). The present population also conforms well with Sikkim as well as Manipur populations except in having a shorter and robust body (0.31–0.39 vs 0.44 mm, a = 17–23 vs 25); lower b value (2.4–2.8 vs 3.6); a slightly shorter odontostyle (4.5–5.5 vs 6.0 µm) and tail (11–12 vs 13 µm) than in the Sikkim population; and a slightly lower c’ ratio (0.8–1.0 vs 1.0–1.1) than in Manipur population, as well as the presence of terminal caudal pore (vs absent in the Manipur population).

Figures

Fig. 4. Tylencholaimus micronanusYeates, 1979, ♀ (LM photographs). A–B. Anterior region.C.Anterior region showing amphid. D. Pharyngeal region. E. Expanded part of pharynx. F. Pharyngo-intestinal junction. G. Vulval region. H–I. Genital system. J. Posterior region. K. Posterior end. Scale bars: A–C, E–K = 10 μm; D = 20 μm.