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Review of the Genus Filenchus Andrassy, 1954 and Descriptions of Six New Species (Nemata: Tylenchidae)

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The genus Filenchus Andrássy, 1954 is reviewed. Close interrelationships indicate congeneric status of Ottolenchus Husain & Khan, 1965; Dactylotylenchus Wu, 1968; Lambertia Brzeski, 1977; Duosulcius Siddiqi, 1979; Zanenchus Siddiqi, 1979 and Discotylenchus Siddiqi, 1980 with Filenchus and are synonymized with Filenchus. The type species, Filenchus vulgaris (Brzeski, 1963) is proposed and an emended diagnosis is given for Filenchus, as well as a list of species, synopsis and key to species. Descriptions are presented for 1) Filenchus normanjonesi sp. n. distinguished by its length (0.638-0.651 mm), stylet 12-14 μm, lateral field a prominent band set off by two lines, and long tail (c = 2.8-3.0); 2) F. adelinae sp. n. by its length (0.418-0.510 mm), stylet 10-12 μm, lateral field with two lines setting off a single band which bears multiple irregular lines seen only by SEM, and tail 120-155 μm; 3) F. elegantulus sp. n. by its length (0.760-0.858 mm), curved tail 128-147 μm, stylet 10-13 μm and sexual dimorphism of head morphology; 4) F. chilensis sp. n. by its length (0.480-0.575 mm); stylet 7.0-8.5 μm; M.B. = 51-57%, filiform tail 116-173 μm, four lines in lateral field and small elliptical amphids on labial plate; 5) F. neonanus sp. n. by amphids tear-drop shaped oriented dorsoventrad, males and spermatheca lacking, and lateral field with four lines (inner pair very faint, seen only by SEM); 6) F. terrestris sp. n. by its length (0.540-0.651 mm), stylet 8-10 μm, head bluntly rounded, labial plate a prominent squarish shape, oral disc strongly concave with six prominent labial papillae. Additional observations are presented as measurements and SEM photographs for Filenchus facultativus (Szczygiel, 1970) comb. n., F. helenae (Szczygiel, 1969) comb. n., F. uliginosus (Brzeski, 1977) Siddiqi, 1986, F. aquilonius (Wu, 1969) Lownsbery & Lownsbery, 1985, F. thornei (Andrássy, 1954) Andrássy, 1963 and F. cylindricus (Thorne & Malek, 1968) Niblack & Bernard, 1985.

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


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