Morphological proxies for taxonomic decision in turrids (Mollusca, Neogastropoda): a test of the value of shell and radula characters using molecular data
Résumé
The state of the art of turrid (= Turridae s.l.) systematics is that shells-when it includes the protoconch-are reliable species-level identifiers, but inadequate proxies for allocation to genera or subfamilies. Generally, the radula is used for allocation to a (sub)family, but the hypothesis that the radula is a more adequate proxy than the shell for relationships has not yet been tested by molecular data. Species of Xenuroturris may have drastically different radulae, with either "semi-enrolled" or "duplex" marginal teeth, although their shells are very similar or even almost indistinguishable. Molecular data confirm that specimens with different types of radulae constitute different species, but two species of a pair with respectively "semi-enrolled" and "duplex" teeth end up being not closely related. However, it is still unresolved whether species with "semi-enrolled" [= Iotyrris] and "duplex" teeth [= Xenuroturris] form two supported monophyletic clades. Iotyrris devoizei n.sp., and I. musivum n.sp., are described from Vanuatu, where they occur sympatrically with I. cingulifera and Xenuroturris legitima.
Domaines
Sciences du Vivant [q-bio]
Origine : Fichiers produits par l'(les) auteur(s)
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