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Molecular phylogenetics of central Canadian Physidae (Pulmonata: Basommatophora)

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The phylogenetic relationships of four nominal south-central Canadian freshwater physids (Physa (sensu lato) skinneri Taylor, 1954, Physa integra (Haldeman, 1841), Physa gyrina (Say, 1821), and the endemic Physa winnipegensis Pip, 2004) were studied by analyses of combined partial sequences coding for mitochondrial 16S and cytochrome c oxidase (COI) genes. Maximum parsimony and neighbour joining analyses, as well as comparisons with published sequences, supported four major clades of physids, of which three are represented in central Canada. Physa skinneri and P. integra were placed within the Physa fontinalis (L., 1758) and Physa acuta Draparnaud, 1805 clades, respectively. Physa winnipegensis formed a distinct branch within the P. acuta group. An additional, previously unreported and unclassified, morph within the P. acuta group was identified from Lake Winnipeg.

Des analyses des séquences partielles combinées codant pour les gènes mitochondriaux 16S et cytochrome c oxydase (COI) nous ont permis d’examiner les relations phylogénétiques de quatre espèces nominales de physidés d’eau douce du centre-sud du Canada (Physa (sensu lato) skinneri Taylor, 1954, Physa integra (Haldeman, 1841), Physa gyrina (Say, 1821) et l’espèce endémique Physa winnipegensis Pip, 2004). Des analyses de parcimonie maximale et du plus proche voisin et des comparaisons avec les séquences disponibles dans la littérature appuient l’existence de quatre clades de physidés, dont trois sont représentés dans le centre du Canada. Physa skinneri se retrouve dans le clade de Physa fontinalis (L., 1758) et P. integra dans celui de Physa acuta Draparnaud, 1805. Physa winnipegensis forme une branche distincte du groupe de P. acuta. Nous avons identifié une forme supplémentaire, encore inédite et non classifiée, dans le groupe P. acuta provenant du lac Winnipeg.

Document Type: Research Article

Publication date: January 1, 2008

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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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