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We describe a new species of goby,    Varicus   lacerta    sp. n. , which was collected from a mesophotic reef at Curacao, southern Caribbean. The new species is the tenth species of    Varicus   , all of which occur below traditional SCUBA depths in the wider Caribbean area. Its placement in the genus    Varicus    is supported by a molecular phylogenetic analysis of three nuclear genes and the mitochondrial gene cytochrome  b . In addition, the new species has one anal-fin pterygiophore inserted anterior to the first haemal spine, which distinguishes    Varicus    species from most species in the closely related and morphologically similar genus    Psilotris   .    Varicus   lacerta    sp. n.  is distinguished from all other named species of    Varicus    by the absence of scales, having highly branched, feather-like pelvic-fin rays, and in its live coloration. We provide the cytochrome c oxidase I DNA barcode of the holotype and compare color patterns of all species of    Varicus    and    Psilotris    for which color photographs or illustrations are available. This study is one of several recent studies demonstrating the utility of manned submersibles in exploring the diversity of poorly studied but species-rich deep-reef habitats.

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Varicus   lacerta   , a new species of goby (  Teleostei  ,   Gobiidae  ,   Gobiosomatini  ,    Nes    subgroup) from a mesophotic reef in the southern Caribbean