A new freshwater crab of the family Hymenosomatidae MacLeay, 1838 from New Caledonia (Crustacea, Decapoda, Brachyura) and an updated review of the hymenosomatid fauna of New Caledonia Author D., Guinot ISYEB (CNRS, MNHN, EPHE, Sorbonne Université), Institut Systématique Évolution Biodiversité, Muséum national d’histoire naturelle, case postale 53, 57 rue Cuvier, 75231 Paris cedex 05, France guinot@mnhn.fr Author de, Mazancourt V. Unité Biologie des organismes et écosystèmes aquatiques (BOREA), Muséum national d’histoire naturelle, Sorbonne Université, Université de Caen Normandie, Université des Antilles, CNRS, IRD, CP 26, 57 rue Cuvier, 75231 Paris cedex 05, France & Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115 Berlin. Germany. valentin.seizilles-de-mazancourt@edu.mnhn.fr text European Journal of Taxonomy 2020 2020-06-22 671 671 1 29 journal article 10.5852/ejt.2020.671 6f6af3d0-601d-47dc-849d-8ad21170e570 2118-9773 3906756 9EF19154-D2FE-4009-985C-1EB62CC9ACB0 Elamena vesca Ng & Richer de Forges, 1996 Elamene [ sic ] truncata A. Milne-Edwards, 1873: 323 (junior homonym of Trigonoplax truncata Stimpson, 1858 ). Elamena vesca Ng & Richer de Forges, 1996: 273 , fig. 8. Alphonse Milne-Edwards (1873) established Elamene [ sic ] truncata without giving figures and probably not aware of the existence of the Trigonoplax truncata of Stimpson (1858) from Japan . According to Kemp (1917) , these similar specific names are due to coincidence. The two species are in fact different, and a new name, E. vesca , was created by Ng & Richer de Forges (1996) using fresh specimens from New Caledonia as holotype and paratypes . The species is cryptic, intertidal on rocky shores, in shallow waters (about 0.5 m ).