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A new species of the butterflyfish genus    Roa    is herein described from the Verde Island Passage in the Philippines, West Pacific Ocean.    Roa   rumsfeldi    sp. n.  was found on mesophotic coral ecosystems at Puerto Galera and Batangas, and sampled through technical mixed-gas rebreather diving at 100–130 m depth. This represents the fifth known species of    Roa   . The main differences between    Roa   rumsfeldi    sp. n.  and its congeners are the lower number of pored scales in the lateral line, longer snout, longer caudal peduncle, shorter caudal fin, pelvic fin color (dark first spine vs. white in all other    Roa   ), and genetics (8.4% divergence from its closest relative    Roa   modesta    in the mitochondrial  COI  gene).    Roa    spp. are usually seen in pairs, but the two specimens we collected were solitary individuals. We have kept one of the specimens alive in the California Academy of Sciences’ Twilight Zone exhibit for more than one year, where it thrives and is feeding on a variety of dried and fresh food.

Roa rumsfeldi , a new butterflyfish ( Teleostei , Chaetodontidae ) from mesophotic coral ecosystems of the Philippines