Known from the Luzon Island, Philippines.
Upper: Devil’s Point, Luzon, Philippines (CASIZ 084283). Lower: SEM of radula showing lateral teeth on right side (CASIZ 084283). Scale bar = 13 µm. [Photos from Gosliner, 2004 with permission].
The animal is wide, dorso-ventrally flattened, and has a well developed mantle edge bearing eight elongate papillae on each side of the body. There is also a single papilla in the dorsal midline just in front of the gills. There are 4 simple gills, two with a shared base, sit just in front of the anus, and the other two sit one on each side of the anus. The rhinophores are very long, similar in length to the mantle papillae, and have approximately 18 lamellae.
The general body color is an opaque yellowish white. There is a broad mid-dorsal band of brown that runs from in front of the rhinophores to the posterior end of the foot. This band is broken up into a series od patches by a network of thin white lines. The brown band is outlined with a thin opaque white line and the space around the base of the single median mantle papilla also has a white border, similar to Okenia kendi. The notal papillae, rhinophores and gill are yellowish white with brown patching. In some papillae the brown is confined to a band about halfway along the length of the papilla and in other papillae there are brown patches scattered over the upper half. The gills and rhinophores have scattered brown spots along their entire length. The living animal was 7 mm in length
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 lambat Gosliner, 2004. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/okenlamb