Un cas d'espèces jumelles allotopiques: Marginella festiva Kiener, 1841 et M. bavayi Dautzenberg, 1910
Boyer, F. (2017). Un cas d'espèces jumelles allotopiques: Marginella festiva Kiener, 1841 et M. bavayi Dautzenberg, 1910. Xenophora taxonomy 15: 45-52
In: Xenophora taxonomy. Association Française de Conchyliologie - Xenophora: Paris. ISSN 2271-0906, more
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| Abstract |
Marginella festiva Kiener, 1841 and M. bavayi Dautzenberg, 1910, studied in situ in the Dakar region (Senegal), present the characteristics of quasi-twin species occupying contiguous but distinct habitats, the first on hard bottoms, the second on soft bottoms. Beyond a shared decoration model for the shell, the differentiation between the two species is decisively established on the chromaticity of the animal, although the morphology of the shells and their decoration differ in several constant features. The similarity of the models representedin the external characters, in particular for the morphology and the decoration of the shells, attest to the fact that they belong to the same species radiation on a regional scale, but the number of phenetic differences suggests a relatively large evolutionary deviation between the two species. The known distribution of M. bavayi extends from the Bay of Goree to the north of Mauritania and could probably extends to all or part of the Guinean plateau, whereas the distribution of M. festiva is known to date only of the Cape Verde Peninsula, of whichit could be endemic. |
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