Known at present only from southwestern Australia
Upper: Holotype. Figure of 8 Island, Esperance, Western Australia, 24 Feb 1983, AM C139217 Photo: G.Saueracker. Lower: Cove East of Mason Bay, Hopetown, Western Australia, 8 Jan 1986 WAM217-85, Black background, Photo: C. Bryce.
The mantle and body are translucent white. The mantle is smooth without papillae. There is a yellow band around the edge of the mantle formed from a scattering of yellow pigment spots. The yellow spots stop just inside the translucent white edge of the mantle. The yellow band could be described as submarginal but as it is so close to the edge such a description could be misinterpreted. Compared with the submarginal band of Chromodoris aureomarginata the yellow band of C. nigrobranchiata is marginal. The rhinophore stalks are translucent white and the clubs black. The rachis of each of the five tripinnate gills is translucent, the clubs pinnules black.
- Rudman, W.B. (1985) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris aureomarginata, C. verrieri and C. fidelis colour groups. Zoological Journal of the Linnean Society 83: 241-299.
Rudman, W.B., 2010 (June 4) Cadlina nigrobranchiata Rudman, 1985. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/cadlnigr