Untangling species identity in gastropods with polymorphic shells in the genus Bolma Risso, 1826 (Mollusca, Vetigastropoda)

  • Magalie Castelin ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Département Systématique et Evolution, Sorbonne Universités, CP 26, 57 rue Cuvier, 75231 Paris Cedex 05
  • Suzanne T. Williams Department of Zoology, The Natural History Museum, London SW7 5BD
  • Barbara Buge Direction des Collections, 55 rue Buffon, CP 51, 75231 Paris Cedex 05
  • Philippe Maestrati ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Département Systématique et Evolution, Sorbonne Universités, CP 26, 57 rue Cuvier, 75231 Paris Cedex 05
  • Josie Lambourdière Service de Systématique Moléculaire, UMS 2700 MNHN – CNRS, Département Systématique et Evolution, Muséum national d’Histoire naturelle, 43 rue Cuvier, 75005 Paris
  • Tomowo Ozawa Department of World Heritage, Cyber University, Nagoya Office, Ikegamicho-2-7-1-203, Chikusa-ku, Nagoya 464-0029
  • José Utge Service de Systématique Moléculaire, UMS 2700 MNHN – CNRS, Département Systématique et Evolution, Muséum national d’Histoire naturelle, 43 rue Cuvier, 75005 Paris
  • Arnaud Couloux GENOSCOPE, Centre National de Séquençage, 2 rue Gaston Crémieux, CP 5706, 91057 Evry Cedex
  • Axel Alf University of Applied Sciences, Weihenstephan-Triesdorf, 91746 Triesdorf
  • Sarah Samadi ISYEB – UMR 7205 – CNRS, MNHN, UPMC, EPHE, Muséum national d’Histoire naturelle, Département Systématique et Evolution, Sorbonne Universités, CP 26, 57 rue Cuvier, 75231 Paris Cedex 05
Keywords: 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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Published
2017-02-28
How to Cite
Castelin, M., Williams, S. T., Buge, B., Maestrati, P., Lambourdière, J., Ozawa, T., Utge, J., Couloux, A., Alf, A., & Samadi, S. (2017). Untangling species identity in gastropods with polymorphic shells in the genus Bolma Risso, 1826 (Mollusca, Vetigastropoda). European Journal of Taxonomy, (288). https://doi.org/10.5852/ejt.2017.288