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The Unusual Position of the Phasmids in Coslenchus Costatus (De Man, 1921) Gen. N., Comb. N. and Other Tylenchidae (Nematoda: Tylenchida)

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Phasmids are reported in Aglenchus, Campbellenchus, Coslenchus gen. n., Filenchus, Irantylenchus, Malenchus, Ottolenchus and Tylenchus as occurring just dorsal to the lateral fields in the post-median region of the body of males, females and juveniles; in the female their position being at or near the vulva. This unusual position of the phasmids is a unique feature of the Tylenchidae. In Coslenchus costatus (de Man, 1921) gen. n., comb. n. the phasmids generally occur on the first dorsal ridge next to the lateral field. Coslenchus gen. n. is proposed for those species of Aglenchus, sensu lato, that have longitudinal cuticular ridges around the body. The type-species C. costatus (de Man, 1921) comb. n. and C. areolatus (Egunjobi, 1967) comb. n., C. indicus (Khan, Chawla & Prasad, 1969) comb. n. and C. lycopersicus (Husain & Khan, 1976) comb. n. are included in the new genus.

Affiliations: 1: Commonwealth Institute of Helminthology, St. Albans, Hertfordshire, England


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