Mononchida (Nematoda) from Silent Valley National Park, India Author Nusrat, Tabinda Author Anjum, Ashher Author Ahmad, Wasim text Zootaxa 2013 3635 3 224 236 journal article 10.11646/zootaxa.3635.3.2 c91dddf8-a95f-48f1-8eab-78f1a9cb7c5d 1175-5326 217282 2FD4024A-6AEF-4B71-9377-695AD5C391AD Clarkus sheri (Mulvey, 1967) Jairajpuri, 1970 ( Fig. 3A–D ) = Mononchus sheri Mulvey, 1967 Measurements: Table 2 . Female: Buccal cavity 1.7–2.0 times as long as wide; dorsal tooth comparatively small, its apex at 66–72% from the base of stoma; subventral wall provided with non-denticulate ridge originating at level anterior to dorsal tooth apex. Amphidial aperture slightly anterior to the level of dorsal tooth apex. Female genital system amphidelphic; sphincter at oviduct-uterus junction poorly developed. Vagina thick walled extending inward, slightly less than one-fourth of the corresponding body width; pars proximalis vaginae 11–12 μm long with convex walls; pars refringens vaginae with teardrop-shaped sclerotizations, each measuring 6–7×4–5.5 μm, cw 10–12 μm; pars distalis vaginae 2.5–3.0 μm, short with circular walls. Tail conoid, ventrally arcuate, 2.6–3.0 times anal body width long. Caudal glands weakly developed and lacking terminal opening. Male: Not found. Habitat and locality: Soil around the roots of forest trees from Mukkali, Silent valley national park, Palakkat, Kerala State, India . Remarks: Clarkus sheri ( Mulvey, 1967) Jairajpuri, 1970 was described by Mulvey (1967) from South Africa as Mononchus sheri . Jairajpuri, (1970) proposed the genus Clarkus and transferred Mononchus sheri to this genus and also synonymized Mononchus jugilis Coetzee, 1968 with C. sheri . Jairajpuri and Khan (1982) reported it from high altitudes in North India . Ahmad et al. (2010) recently reported this species from Japan . The present specimens, though agreeing fairly well with the earlier descriptions, are more similar to the recently described Japanese specimens with buccal cavity 39– 41 x 21–23 µm. Mulvey (1967) and Jairajpuri and Khan (1982) reported buccal cavity measurements as 32– 38 x 19–23 µm and 34– 38 x 16–18 µm respectively. Weakly developed caudal glands were also observed in the present specimens.