Three new species of the caridean family Alvinocarididae are described from hydrothermal vents in the Southwest Pacific, namely, Chorocaris parva sp. nov. (Manus Basin, 1305–1684 m), Chorocaris variabilis sp. nov. (Manus and North Fiji basins and Vanuatu, 1305–2480 m) and Manuscaris acuminatus gen. et sp. nov. (Manus Basin, 1310 m). Morphological affinities of these three species are discussed. Molecular genetic analysis using partial sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene supports the recognition of the two new species assigned to Chorocaris Martin and Hessler, 1990. The generic diagnosis of Chorocaris is slightly emended to accommodate the two new species. Opaepele susannae Komai, Gierre and Segonzac, 2007 is transferred to Chorocaris. Alvinocaris komai Zelnio and Hourdez, 2009, originally described from the Lau Basin, is newly recorded from the North Fiji Basin and Vanuatu (Nifonea vent field), at depths of 1740–2750 m.http://zoobank.org/urn:lsid:zoobank.org:pub:4BFC8C31-C006-4738-BED7-B13D3296A7CA
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