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2026 · Photo: Boaz Liebes
Faithful sea slug
Philippines · Indo Pacific - South China Sea
A small, colourful Goniobranchus that is widespread across the tropical Indo-West Pacific. Several colour variants occur throughout its range, differing mainly in how much wine-red edges the orange border.
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Creamy-white mantle with a broad orange to red band around the edge, separated from the white by a thin wine-red line; tongue-like patches often project from the band into the white centre. Rhinophores and gills black (or blackish); foot white. Grows to about 20–25 mm.
Goniobranchus verrieri and G. aureomarginatus have white mantles with a yellow border but pale, not black, rhinophores and gills.
Coral and rocky reefs, from shallow water.
Sponges (feeding has been photographed in the field).
