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Six New Species of Coslenchus Siddiqi, 1978 (Nematoda: Tylenchidae)

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Coslenchus turkeyensis sp. n. from gladiolus soil in Turkey has 12 longitudinal cuticular ridges besides the lateral fields, a well developed postvulval uterine sac and rudimentary lateral vulval membranes. C. pycnocephalus sp. n. and C. multigyrus sp. n. from cauliflower soils in Syria are recognized, respectively, by a strongly sclerotized cephalic framework and by 22 longitudinal ridges excluding lateral fields. C. alacinatus sp. n. from maize and tomato soils in Portugal lacks lateral vulval membranes and has the excretory pore at or near the oesophageal base. C. franklinae sp. n. from Nigeria and Ghana differs from C. costatus to which it is related in having a body less than 0.5 mm long, a continuous cephalic region which is broadly rounded to truncate and narrower lateral fields being 1/4 as wide as body. C. bisexualis sp. n. is bisexual and the smallest (0.36-0.38 mm long) species in the genus. The new species are described and a key to differentiate between the various nominal species is given. Tylenchus cancellatus Cobb, 1925 is reinstated as Coslenchus cancellatus (Cobb, 1925) comb. n. A neotype has been designated for Coslenchus costatus (de Man) and Coslenchus lycopersicus (Husain & Khan, 1976) is regarded as a species inguirenda.

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


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