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Morphology of Monhystera Coomansi Sp.N. From Algeria (Nematoda: Monhysteridae)

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The morphology of Monhystera coomansi sp.n., a free-living benthic species from Algeria, is described in detail. The new species is characterised by the presence of the longest spicules (135-220 μm) hitherto found in the genus and a gubernaculum with two plate-like, lateral apophyses and a median horsehead-shaped apophysis. The female of M. coomansi sp.n. is characterised by the following combination of characters: numerous ovoid and hyaline cells associated with the uterus, one pair of double, postvulval, granulated cells, tail longer than vulva-anus distance ( > 1.2) and the occurrence of vivipary. Copulatory, cloacal, rectal and vaginal gland cells are also reported in the new species. SEM photographs of M. coomansi sp.n. demonstrate the occurrence of many perioral platelets. This newly discovered structure is found to be characteristic for the genera Monhystera and Eumonhystera within the Monhysteridae. Two forms of this species were found at a second Algerian locality. The first form is larger than, but similar to the type population; the second form has a differently-shaped amphideal fovea, indistinct postvulval gland cells and almost indiscernible gubernaculum apophyses.

Affiliations: 1: Rand Afrikaans University, P.O. Box 524, Johannesburg 2000, South Africa


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