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 Remarks on Odiomaris aff. pilosus from the Iouanga River and two other streams A lot of specimens obtained belatedly in the course of our research poses a problem: collected in the Iouanga River on 17 November 2016 (see Fig. 10 ) (MNHN-IU- 2018-2999 ) and previously identified to Odiomaris pilosus , they split into two species: four males are certainly O. pilosus , but about twenty individuals of various sizes (a few males and a larger number of females) do not correspond either to this species or to Richerius marqueti gen. et sp. nov. ; nor is it identifiable with Odiomaris estuarius . The same unidentified species was found in another stream of the North Province and is believed to inhabit another stream in the South Province ( Fig. 10 ) (manuscript in progress). Material examined NEW CALEDONIA – North Province • 8 ♂♂ , 7 ovigerous ♀♀ , 13 subadults and inmatures; Kaala-Gomen township , Tegon locality , Iouanga River, st. HYNC 720; 20º41.032ʹ S , 164º23.676ʹ E ; 4 m a.s.l. ; 17 Nov. 2016 ; “Our Planet Reviewed”, Hydrobio exped.; Valentin de Mazancourt leg.; MNHN-IU-2018-2999 • 1 ♂ ; Canala township , stream tributary of the Negropo River , st. HYNC 790; 21º30.765ʹ S , 165º56.438ʹ E ; 4 m a.s.l. ; 9 Nov. 2017 ; “Our Planet Reviewed”, Hydrobio exped.; Valentin de Mazancourt and Nicolas Charpin leg.; MNHN-IU-2018-3001 .