Francisco Araya, JuanJuanFrancisco ArayaNewman, William AndersonWilliam AndersonNewman2025-12-302025-12-3020181932-6203https://hdl.handle.net/20.500.12740/23796Deep waters of the South Pacific off northern Chile remain poorly studied, particularly in regard to invertebrate faunas. Some recent works include new records on deep-water species, mostly from the bycatch of benthic fisheries concentrated along the continental margin of the country. Among these, a few specimens of an unidentified bathylasmatine balanomorph were collected off Caldera, northern Chile, and they are described here as Bathylasma chilense sp. nov. While this is the second report of a bathylasmatid in the Eastern Pacific Ocean, the first being Tetrachaelasma southwardi Newman & Ross, 1971, it is not only the first but the deepest known (1800-2000 m) species of Bathylasma. Its discovery increases the number of described Bathylasma species to eight, four of which are extant. This is the third deep-water balanomorph cirriped recorded for the region where it may represent an isolate from a West Wind Drift fauna, an immigrant from the western Pacific, or a relict of a once cosmopolitan Paleocene-Eocene fauna now having an amphitropical component.Acceso AbiertoSALA Y GOMEZSOUTHEASTERN PACIFICACORN BARNACLE1ST RECORDSOUTHERN-HEMISPHEREMOLECULAR PHYLOGENYNORTHERNOCEANFAMILIESEASTERhttp://dx.doi.org/10.1371/journal.pone.0197821