Untangling species identity in gastropods with polymorphic shells in the genus Bolma Risso, 1826 (Mollusca, Vetigastropoda)
Type | Article | ||||||||||||
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Date | 2017-02 | ||||||||||||
Language | English | ||||||||||||
Author(s) | Castelin Magalie1, 2, Williams Suzanne T.3, Buge Barbara4, Maestrati Philippe2, Lambourdiere Josie5, Ozawa Tomowo6, Utge Jose5, Couloux Arnaud7, Alf Axel8, Samadi Sarah2, 5 | ||||||||||||
Affiliation(s) | 1 : Fisheries & Oceans Canada, Pacific Biol Stn, 3190 Hammond Bay Rd, Nanaimo, BC V9T 6N7, Canada. 2 : Sorbonne Univ, ISYEB, UMR 7205, CNRS,MNHN,UPMC,EPHE,Dept Systemat & Evolut, CP 26,57 Rue Cuvier, F-75231 Paris 05, France. 3 : Nat Hist Museum, Dept Zool, London SW7 5BD, England. 4 : Direct Collect, 55 Rue Buffon,CP 51, F-75231 Paris 05, France. 5 : MNHN, CNRS, Serv Systemat Mol, UMS 2700,Dept Systemat & Evolut, 43 Rue Cuvier, F-75005 Paris, France. 6 : Cyber Univ, Nagoya Off, Dept World Heritage, Chikusa Ku, Ikegamicho 2-7-1-203, Nagoya, Aichi 4640029, Japan. 7 : Ctr Natl Sequencage, GENOSCOPE, 2 Rue Gaston Cremieux,CP 5706, F-91057 Evry, France. 8 : Univ Appl Sci Weihenstephan Triesdorf, D-91746 Triesdorf, Germany. |
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Source | European Journal Of Taxonomy (Museum Natl Histoire Naturelle), 2017-02 , Vol. 288 , P. 1-21 | ||||||||||||
DOI | 10.5852/ejt.2017.288 | ||||||||||||
WOS© Times Cited | 8 | ||||||||||||
Keyword(s) | Turbinidae, cox1, 28S, deep-sea environments, molecular systematics | ||||||||||||
Abstract | In shelled molluscs, assigning valid species names to independent evolutionary lineages can be a difficult task. Most original descriptions are based on empty shells and the high levels of variation in shape, color and pattern in some groups can make the shell a poor proxy for species-level identification. The deep-sea gastropod turbinid genus Bolma is one such example, where species-level identification based on shell characters alone is challenging. Here, we show that in Bolma both traditional and molecular taxonomic treatments are associated with a number of pitfalls that can lead to biased inferences about species diversity. Challenges derive from the few phylogenetically informative characters of shells, insufficient information provided in original descriptions and sampling artefacts, which at the molecular level in spatially fragmented organisms can blur distinctions between genetically divergent populations and separate species. Based on a comprehensive dataset combining molecular, morphological and distributional data, this study identified several cases of shell-morphological plasticity and convergence. Results also suggest that what was thought to be a set of distinct, range-restricted species corresponds instead to a smaller number of more widespread species. Overall, using an appropriate sampling design, including type localities, allowed us to assign available names to evolutionarily significant units. |
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