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Descriptions of Two New Species and Other Observations On the Genus Cephalenchus Goodey, 1962 (Nemata: Tylenchidae)

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Cephalenchus chilensis sp. n. is described, distinguished by its large size (L of female = 0.70-0.82 mm), cephalic region not at all set off, stylet = 15-20 m and tail length = 144-214 μm. Cephalenchus brevicaudatus sp. n. is described, distinguished by its short tail (54-93 μm), position of excretory pore at or anterior to hemizonid, and stylet = 19-25 μm. Three populations of C. leptus Siddiqi, 1963 were studied leading to synonymization of C. limichus Nesterov, 1973 with C. leptus. Imphalenchus indicus Dhanachand & Jairajpuri, 1980 is transferred to Cephalenchus and the genus Imphalenchus proposed a synonym of Cephalenchus. Imphalenchus macrodorus (Chawla et al. , 1969) is removed from Imphalenchus and considered a species incertae sedis in the Tylenchinae. C. rotundus Siddiqui & Khan, 1983 is synonymized with C. emarginatus (Cobb, 1893) and C. megacephalus Goodey, 1962 and C. planus Siddiqui & Khan, 1983 with C. hexalineatus (Geraert, 1962). The generic diagnosis of Cephalenchus is emended, and a key to the species is presented.

Affiliations: 1: Division of Nematology, University of California, Davis, CA 95616, U.S.A.; 2: Instituut voor Dierkunde, K. L. Ledeganckstraat 35, 9000 Gent, Belgium


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