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Unusual Malenchus Species (Nematoda: Tylenchidae)

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Malenchus williamsi n. sp. is exceptional among Malenchus spp. because of the six lines in its lateral field, long vulval flaps and a post-vulval phasmid. M. parthenogeneticus sp. n. and M. leiodermis sp. n. are also exceptional by having four lines in the lateral field and parthenogenetic reproduction: no males, no spermatheca developed. M. parthenogeneticus sp. n. is a very small species with crenate body annuli; M. leiodermis sp. n. is larger and has smooth annuli. M. macrodorus sp. n. is exceptional because of its long, heavily built stylet, the posterior position of its excretory pore and its wide vulval slit. M. cognatus Andrissy, 1981, M. tantalus Siddiqi, 1979, M. eslami Siddiqui & Khan, 1983 and M. moini Siddiqui & Khan, 1983 are synonymized with M. acarayensis Andrássy, 1968. The original M. sulcus (Wu, 1970) Siddiqi, 1979 is considered to be the same as M. exiguus (Massey, 1969) Andrássy, 1980; M. sulcus in Andrássy (1981) is renamed M. neosulcus sp. n.. M. malawiensis (Siddiqi, 1979) Andrássy, 1981 is considered to be a junior synonym of M. ovalis (Siddiqi, 1979) Andrássy, 1981. A M. andrassyi Merny, 1970 population with curved tail ends is described. M. williamsi, M. parthenogeneticus and M. andrassyi are reported from Orange Bay, Hoste Island, Southern Chile; M. macrodorus, M. acarayensis, M. ovalis and M. nanellus Siddiqi, 1979 are reported from Colorado, U.S.A. and M. acarayensis also from Belgium. For almost all the species S.E.M. views are presented. Diagnosis of the genus is amended and a key to the species is given.

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


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