Black mirrorbelly (Monacoa niger), first described by Poulsen, Sado, Hahn, Byrkjedal, Moku & Miya, 2016 is a tiny fish. Adults typically reach 4.80 cm in maximum length. It inhabits marine coastal and open-ocean environments. Recorded depth range: 0 to 520 metres. It occurs in Deep-water waters. It feeds on a mix of small fish and invertebrates as a mid-level predator.
This species is distinguished by having black pigmentation along the entire sole and possibly have a darker or more blackish body color compared to congeners (scale pockets are darker); and the black streak on the sole possibly consists of distinct patches posteriorly . The holotype is slightly damaged on the sole and variation of its pigmentation pattern must be assessed with future fresh material .: short and / or deep; Cross section: other (see remarks).
Behavioural data for Black mirrorbelly is currently being reviewed.
Marine; bathypelagic; depth range 0 - 520 m . Deep-water Central Pacific: off American Samoa and possibly Australia.
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