Goniodorididae is a family of small dorid nudibranchs in the superfamily Onchidoridoidea, including genera such as Goniodoris, Okenia, Trapania, Ancula and Lophodoris. Most species are only a few millimetres to about two centimetres long and occur worldwide, with many in the Mediterranean and the Indo-West Pacific. They mainly feed on bryozoans and colonial ascidians, and some Trapania species feed on entoprocts. Many species are rarely seen because of their size, and new species continue to be described.
◎Identification
Small, slender, often translucent dorids in which the mantle is reduced to a ridge or to a row of finger-like processes along each side of the body. The gills form a small, non-retractable cluster on the rear of the back, often flanked by extra appendages, and the rhinophores are usually lamellate. Unlike most dorids they cannot withdraw their gills into a pocket.
