About Goniobranchus fidelis (Kelaart, 1858)
Goniobranchus fidelis can grow to over 25 mm (0.98 inches) in length. Its foot is cream-colored, elongated, and almost entirely covered by the edges of its wide mantle. The central section of the mantle has a creamy-white region with scalloped edges, while the entire wide outer margin of the mantle is orange or red. A burgundy-colored border lies between these two differently colored regions, and its width varies between individual animals. The rhinophores are laminated, contractile, and greyish, with a lighter color at their tips, and the shade of grey also varies between individuals. The gills share the same color as the rhinophores and are retractable. This species was first described from specimens collected in Sri Lanka, in the Indian Ocean. Its full distribution covers the tropical Indo-West Pacific region and the Red Sea. It inhabits external reef areas, reef tops, and reef slopes down to 20 m (66 ft) deep, and prefers areas with dead corals.
