{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T07:01:47Z","timestamp":1788246107345,"version":"build-2803163510"},"reference-count":14,"publisher":"PeerJ","license":[{"start":{"date-parts":[[2024,2,28]],"date-time":"2024-02-28T00:00:00Z","timestamp":1709078400000},"content-version":"unspecified","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"SIO Director\u2019s Office, the Scripps Oceanographic Collections Fund, and the Lehman-Kennel Endowment for the Collections at SIO"},{"name":"The Natural History Museum of Los Angeles County supported the expedition"},{"name":"The East Pacific Corridor Alliance supported the expedition"},{"name":"National Science Foundation supported the \u00b5CT scanner at the NHMLA","award":["DBI 2215184"],"award-info":[{"award-number":["DBI 2215184"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>A new labrid fish species, <jats:italic>Halichoeres sanchezi<\/jats:italic> n. sp., is described from eight specimens collected in the Revillagigedo Archipelago in the tropical eastern Pacific Ocean, off the coast of Mexico. The new species belongs to the <jats:italic>Halichoeres melanotis<\/jats:italic> species complex that is found throughout the region, differing by 2.4% in the mtDNA cytochrome c oxidase I sequence from its nearest relative, <jats:italic>H. melanotis<\/jats:italic> from Panama, and 2.9% from <jats:italic>Halichoeres salmofasciatus<\/jats:italic> from Cocos Island, off Costa Rica. The complex is distinguished from others in the region by having a black spot on the opercular flap and a prominent black area on the caudal fin of males. The juveniles and initial phase of the new species closely resemble those of <jats:italic>H. salmofasciatus<\/jats:italic> and <jats:italic>Halichoeres malpelo<\/jats:italic> from Malpelo Island of Colombia, differing in having an oblong black spot with a yellow dorsal margin on the mid-dorsal fin of initial-phase adults as well as on juveniles. In contrast, the terminal-phase male color pattern is distinct from other relatives, being vermilion to orangish brown with dark scale outlines, a white patch on the upper abdomen, and a prominent black band covering the posterior caudal peduncle and base of the caudal fin. The new species adds to the list of endemic fish species for the isolated archipelago and is an interesting case of island endemism in the region. The discovery was made during the joint 2022 collecting expedition to the archipelago, which featured a pioneering collaborative approach to an inventory of an island ichthyofauna, specifically including expert underwater photographers systematically documenting specimens <jats:italic>in situ<\/jats:italic>, before hand-collection, and then photographed fresh, tissue-sampled, and subsequently vouchered in museum collections.<\/jats:p>","DOI":"10.7717\/peerj.16828","type":"journal-article","created":{"date-parts":[[2024,2,28]],"date-time":"2024-02-28T10:03:01Z","timestamp":1709114581000},"page":"e16828","source":"Crossref","is-referenced-by-count":3,"title":["<i>Halichoeres sanchezi<\/i> n. sp., a new wrasse from the Revillagigedo Archipelago of Mexico, tropical eastern Pacific Ocean (Teleostei: Labridae)"],"prefix":"10.7717","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8728-9585","authenticated-orcid":true,"given":"Benjamin 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