Sea spiders (Arthropoda: Pycnogonida) collected during the Madibenthos Expedition from Martinique shallow waters Author Sabroux, Romain F48B4ABE-06BD-41B1-B856-A12BE97F9653 Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle CNRS, Sorbonne Université, EPHE, UA. 57 rue Cuvier, CP 51, 75005 Paris, France. pycnogonides@gmail.com Author Hassanin, Alexandre 6CAA213C-384A-4111-8F70-1E8E07D3347D Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle CNRS, Sorbonne Université, EPHE, UA. 57 rue Cuvier, CP 51, 75005 Paris, France. alexandre.hassanin@mnhn.fr Author Corbari, Laure 9E5EBA7B-C2F2-4F30-9FD5-1A0E49924F13 Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle CNRS, Sorbonne Université, EPHE, UA. 57 rue Cuvier, CP 51, 75005 Paris, France. corbari@mnhn.fr text European Journal of Taxonomy 2022 2022-12-12 851 1 1 141 http://dx.doi.org/10.5852/ejt.2022.851.1999 journal article 221137 10.5852/ejt.2022.851.1999 c70e23de-1f95-46fb-899b-9754b6145d52 2118-9773 7428095 7317EA8C-7C05-4E24-A38C-30F860013694 Rhynchothorax crenatus Child, 1982 Rhynchothorax crenatus Child, 1982a: 374–376 , fig. 167. Rhynchothorax crenatus – Child 1996a: 530 . — Stock 1986 : tab. 1. — Sabroux et al. 2019b : tab. 1, fig. 3. Type material Holotype : USNM 170996 (not examined). Type locality: Carrie Bow Cay , Belize . Material examined MARTINIQUE • 1 juv. ; Le Robert ; 14°43.2ʹ N , 60°50.6ʹ W ; depth 23 m ; 25 Sep. 2016 ; st. AB405; MNHN-IU-2016-852/ MK411165 . Remarks The holotype of Rhynchothorax crenatus is a juvenile (Child 1982). Later, Child (1996a) found adults of R. mediterraneus Costa, 1861 and considered that they were the adult form of R. crenatus . Since there is no clear argument to justify that these two species are conspecific, we prefer to regard R. crenatus as valid for the moment. It is worth noting, however, that the Martinique specimen is also a juvenile, so we cannot refute Child’s hypothesis. DNA barcode sequences will be useful to further investigate this question, when a sufficient sampling of DNA barcoding sequences from R. mediterraneus becomes available. Rhynchothorax mediterraneus is a species mostly known from the Mediterranean, with some records in the Indo-Pacific ( Stock 1974 ; Miyazaki & Stock 1995 ) and Brazil (e.g., Stock 1992a ), but it has only been recorded in the Caribbean by Child (1996a) . Rhynchothorax crenatus is recorded for the first time outside of Belize . The single specimen was collected on the Atlantic coast of Martinique . Distribution Only recorded from Belize and Martinique . Depth range Recorded in literature at 27 m . The Martinique specimen was found at 23 m .