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Halgerda okinawa  Carlson & Hoff, 2000

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This recently described (Carlson & Hoff, 2000) species of Halgerda is relatively large, growing to at least 125mm long. It has the typical mantle ridges and depressions of most members of the genus. Apparently unique to this species, the yellow pigment on the tubercles is not just a surface pigment but is incorporated in the tissue right to the core of the tubercles. Halgerda okinawa looks like a coulour variant of Halgerda willeyi, but this one has translucent rhinophores and gills with black markings, Halgerda okinawa has orange rhinophores with a black posterior midline of the rhinophore clubs. The gills are translucent orange with black spots.
More information on Halgerda okinawa are on Bill Rudman's Sea-Slug Forum!