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Five new species of Rhigonema Cobb, 1898 (Rhigonematida: Rhigonematidae) from the Philippines and Vietnam with observations on the morphology of the Indo-Malayan forms and nematophagy by R. voratum sp. n.

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Five new species of Rhigonema are described and illustrated from the gut of diplopods collected from the Philippines and Vietnam. R. flabellifer sp. n., R. golovatchi sp. n., R. rigonanae sp. n., R. spiridonovi sp. n. and R. voratum sp. n. are differentiated from one another and the remaining species in the genus by a combination of characters including form of the cephalic extremity, development and extent of the pilose region, female genital tract type, male and female tail shape, spicule form and number and disposition of the copulatory papillae. Two species, both from polydesmid diplopods, bear an unusual pedunculate, flap-like projection on each sector of the triangular oral aperture and have only thirteen copulatory papillae. Such projections have only previously been described from R. lanceacauda, a species from the West Indies that also shares a reduced and similarly arranged complement of thirteen male papillae. The morphology, bionomics and distribution of Rhigonema are discussed and evidence presented for the first time that nematophagy is practised by at least one species in the genus. Rhigonema leonilae (Sanchez-Velazquez, 1979) comb. n. is proposed for Ruizia leonilae Sanchez-Velazquez, 1979. Cinq nouvelles especes de Rhigonema Cobb, 1898 (Rhigonematida: Rhigonematidae) des Philippines et du Vietnam et observations sur la morphologie des formes indo-malaises et la nematophagie chez R. voratum sp. n. - Cinq nouvelles especes de Rhigonema provenant des intestins de diplopodes collectes aux Philippines et au Vietnam sont decrites et illustrees. R. flabellifer sp. n., R. golovatchi sp. n., R. rigonanae sp. n., R. spiridonovi sp. n. et R. voratum sp. n. sont differencies les uns des autres et des autres especes du genre par une combinaison de caracteres incluant la forme de l'extremite cephalique, le developpement et l'etendue de la pilosite, le type de tractus genital femelle, la forme de la queue du male et de la femelle, la forme des spicules et le nombre et la repartition des papilles copulatrices. Deux especes, provenant toutes deux de Diplopodes Polydesmides, portent une projection inhabituelle, pedonculee, en forme de languette, sur chacun des secteurs de l'ouverture buccale triangulaire et comptent seulement treize papilles copulatrices. De telles projections n'ont ete precedemment decrites que chez R.lanceacauda, une espece originaire des Antilles, qui exhibe egalement un cortege reduit de treize papilles chez le male avec la meme repartition. La morphologie, le comportement et la repartition des Rhigonema sont discutes et la preuve est apportee pour la premiere fois que la nematophagie est pratiquee par au moins une espece de ce genre. Rhigonema leonilae (Sanchez-Velazquez, 1979) comb. n. est propose pour Ruizia leonilae Sanchez-Velazquez, 1979.


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