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The African Carnoyidae (Nematoda: Rhigonematida). 1. Brumptaemilius brevispiculus sp. n. from Ghana with observations on copulatory plugs and spermatophore development

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For more content, see Nematologica.

Brumptaemilius brevispiculus sp. n. from the gut of a spirostreptid diplopod from Ghana is described and illustrated with the aid of SEM. The species is characterised by the structure of the male area rugosa, particularly the ventral extension of the rugosities on to the tail spike and the transverse rows of imbricate spines in the postcloacal region, the tail spike ca 1-1.5 gubernaculum length long, the very short spicules bearing relatively few transverse striae, the form and disposition of the copulatory papillae and the presence of an external, pedunculate spermatophore. It is distinguished from the other nominal species in the genus, including all of the ten species inquirendae, principally by a combination of the unusually short spicules, the form of the area rugosa, vulval position and the extent of the lateral alae in both sexes. The development of copulatory plugs and spermatophores within the African Carnoyidae is discussed. Simple copulatory plugs exist in Gilsonema and Waerebekeia, but specialised spermatophores occur in Afrocarnoya and Brumptaemilius. The most complex spermatophore is found in Brumptaemilius and comprises an oval structure containing sperm connected by a hollow peduncle to the vulval/vaginal region of the female, the peduncle being inserted under the anterior vulva lip and firmly cemented into position by a copulatory plaque. This is only the second report of spermatophore development within the Nematoda.

Affiliations: 1: CABI Bioscience, UK Centre, Bakeham Lane, Egham, Surrey, TW20 9TY,UK


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