Atagema rugosa, the rugby-ball dorid, is a species of dorid nudibranch, a marine gastropod mollusc in the family Discodorididae.
Distribution This species was described from Cap l'Abeille, near Banyuls-sur-Mer, France. It has been reported from the bay of Gallipoli, Italy,Perrone, A. S. 1983. Descrizione de un raro nudibranco mediterraneo: Atagema rugosa (Pruvot-Fol, 1951). Bollettino Malacologico (Pubblicazione Mensile Edita dalla Societa Italiana di Malacologia) 19(1-4):49-56. in the Mediterranean Sea and around the southern African coast on the Atlantic side of the Cape Peninsula in 10–15 m of water.Gosliner, T.M. 1987. Nudibranchs of Southern Africa It is probable that the species known by this name in South Africa is actually a distinct species.
Description Atagema rugosa is described as a beige animal, darker in the lower parts of the mantle. Its tubercles are arranged in crests forming a network. It has five gills, with the three posterior held almost horizontal and the two anterior very small. The South African rugby-ball dorid is a small white nudibranch with black spots, a warty skin and a distinct longitudinal ridge down the middle of its back. It has eight gills arranged around the anus and its rhinophores are perfoliate. It can reach a total length of 30 mm.Zsilavecz, G. 2007. Nudibranchs of the Cape Peninsula and False Bay.
Ecology The rugby-ball dorid feeds on sponges.
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