Revision of the species of Caridina (Decapoda: Atyidae) from the Western Indian Ocean islands with description of a new species

  • Valentin de Mazancourt Laboratoire de Biologie des Organismes et Écosystèmes Aquatiques (UMR 8067 BOREA), Muséum national d’Histoire naturelle, CNRS-8067, IRD-207, Sorbonne Université, UCN, UA, Equipe Biodiversité, Plasticité, Adaptation et Conservation, 57 rue Cuvier, CP26, 75005 Paris, France https://orcid.org/0000-0003-3739-603X
  • Marion Mennesson Laboratoire de Biologie des Organismes et Écosystèmes Aquatiques (UMR 8067 BOREA), Muséum national d’Histoire naturelle, CNRS-8067, IRD-207, Sorbonne Université, UCN, UA, Equipe Biodiversité, Plasticité, Adaptation et Conservation, 57 rue Cuvier, CP26, 75005 Paris, France https://orcid.org/0000-0003-1048-2632
  • Gérard Marquet 96 rue de Richelieu, 75002 Paris, France https://orcid.org/0009-0007-8513-9501
  • Philippe Keith Laboratoire de Biologie des Organismes et Écosystèmes Aquatiques (UMR 8067 BOREA), Muséum national d’Histoire naturelle, CNRS-8067, IRD-207, Sorbonne Université, UCN, UA, Equipe Biodiversité, Plasticité, Adaptation et Conservation, 57 rue Cuvier, CP26, 75005 Paris, France https://orcid.org/0000-0002-1600-4909
Keywords: integrative taxonomy, morphology, 16S, amphidromy, endemic

Abstract

We provide an updated checklist and an identification key of the species of Caridina living in freshwater habitats of the Western Indian Ocean islands, including the Seychelles, the Comoros, Mayotte, La Réunion and Mauritius. We list six species including one new for science: Caridina mauritii, Caridina spathulirostris, Caridina similis, Caridina natalensis, Caridina typus and Caridina henriettae sp. nov. Molecular and morphological evidence led us to consider Caridina richtersii as a junior synonym of C. spathulirostris. Due to different life histories, some species are endemic to their island or archipelago, like C. mauritii and C. spathulirostris, endemic to Mauritius, or C. similis endemic to the Seychelles, whereas others have a wider distribution in the Western Indian Ocean like C. natalensis or C. henriettae sp. nov. or have an Indo-West Pacific distribution like C. typus.

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Published
2025-08-07
How to Cite
de Mazancourt, V., Mennesson, M., Marquet, G., & Keith, P. (2025). Revision of the species of Caridina (Decapoda: Atyidae) from the Western Indian Ocean islands with description of a new species. European Journal of Taxonomy, 1007(1), 57–86. https://doi.org/10.5852/ejt.2025.1007.2995
Section
Research article