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Phylogeny of Palaearctic Pharyngodonidae parasite species of Testudinidae: a morphological approach

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The phylogenetic relationships of 23 oxyurid species from five genera (21 parasite species of the Palaearctic Testudinidae, 1 parasite species of Uromastix acanthinurus Bell, 1825 from Algeria, and 1 parasite species of Cteno sa ura pectinata (Wiegmann, 1834) from Mexico) were investigated using 30 morphological characters obtained from species descriptions. The nonweighted analysis produced one shortest tree. All species of the ingroup form a monophyletic group and the oxyurid species of Testudinidae form a monophyletic group. The type species of the genus Alaeuris Thapar, 1925 is the basal member of the species parasitizing Testudinidae. The analysis confirms the monophyly of the genus Thaparia Ortlepp, 1933, whereas the genera Mehdiella Seurat, 1918 and Tachygonetria Wedl, 1862 are considered paraphyletic groups. The large diversification in the genus Tachygonetria is linked to their position in the host caecum. The ancestral state is in the paramucous and the derived state is in the centre of the caecum. This suggests that recent speciation in the group occurs in the centre of the caecum.

L'utilisation de 30 caractères morphologiques tirés des descriptions des espèces nous a permis d'étudier les relations phylogénétiques de 23 espèces d'oxyures appartenant à cinq genres, soit 21 espèces parasites de Testudinidae paléarctiques, 1 espèce parasite d'Uromastix acanthinurus Bell, 1825 d'Algérie et 1 espèce parasite de Ctenosaura pectinata (Wiegmann, 1834) du Mexique. Une analyse non pondérée a généré un seul arbre de longueur minimale. Toutes les espèces du groupe interne forment un ensemble monophylétique et les oxyures parasites de Testudinidae sont aussi monophylétiques. L'espèce type du genre Alaeuris Thapar, 1925 est le taxon basal aux autres Pharyngodonidae parasites de Testudinidae. L'analyse confirme la monophylie du genre Thaparia Ortlepp, 1933; en revanche, elle indique que les genres Mehdiella Seurat, 1918 et Tachygonetria Wedl, 1862 sont paraphylétiques. La grande diversification du genre Tachygonetria est associée à la position des espèces dans le caecum. L'habitat ancestral est la paramu queuse et l'habitat dérivé est le centre du caecum. Il semble donc que la spéciation récente de ce groupe se produise dans le centre du caecum.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2003-11-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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