Known only from Luzon Island, Philippines and Bali, Indonesia
Upper: Luzon, Philippines. Photo: T.M.Gosliner. Lower: SEM of radula showing inner lateral tooth (right) and two outer lateral teeth (left). Scale bar = 2 µm. [Photos from Gosliner, 2004 with permission].
The body is a uniform translucent white, with a chocolate brown band down each side of the body and irregular spots of the same color scattered over the mantle. Along the mantle edge on each side are five or six elongate lateral papillae, the two anterior-most papillae on each side are situated in front of the rhinophores and are anteriorly directed. There are also four to seven elongate papillae scattered mid-dorsally in front of the gills and there is a single median papilla immediately behind the gills. The oral tentacles are elongate and extend well beyond the margin of the foot. The largest animals so far reported are between 4-6 mm in length. It has been found on ctenostomatous bryozoans on the undersides of the large foliose sponge colonies.
Gosliner, T. M. (2004) Phylogenetic Systematics of Okenia, Sakishimaia, Hopkinsiella and Hopkinsia (Nudibranchia: Goniodorididae) with descriptions of new species from the tropical Indo-Pacific. Proceedings of the California Academy of Sciences, 55: 125-161.
Rudman, W.B., 2004 (December 21) Okenia brunneomaculata Gosliner, 2004. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/okenbrun
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