Indian Agricultural Research Institute, New Delhi-110012.
* Part of the thesis submitted to P.G. School, I.A.R.I., New Delhi-110012 for the award of Ph.D. Degree.
Five new species of the genus Coslenchus Siddiqi, 1978 viz., Coslenchus brevis sp. n., C. emelcius sp. n., C. lycus sp. n. C. tausifi sp. n, and C. temperatus under the sub-family Tylenchinae are described and illustrated. Coslenchus brevis sp. n. is characterized by having a body 0.41–0.44 mm long and posteriorly placed vulva V=64.6–66.6; C. emelcius sp. n. by 0.42–0.47 mm body length, larger ‘b’ value and more anteriorly placed vulva; C. lycus sp. n. by having body 0.35–0.43 mm long, a=25.0–33.0 μm; b=4.4–5.4; c=04.3–5.8; V=68.1–70.6, body cutic1e marked by 12 longitudinal ridges. C. tausifi sp.n. is distinguished by possessing a body 0.37–0.42 mm long, a=23.3–28.8; continuous head, tail tip rounded and 12 longitudinal ridges and C. temperatus sp. n. is distinctive by having a body length 0.38–0.44 mm; a=24.4–31.5; b=4.25.6; Vc 57-5.66.7; and 14 longitudinal ridges on body.
