Goniobranchus coi is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.Bouchet, P. (2012). Goniobranchus coi. Accessed through: World Register of Marine Species on 2012-05-01Johnson R.F. & Gosliner T.M. (2012) Traditional taxonomic groupings mask evolutionary history: A molecular phylogeny and new classification of the chromodorid nudibranchs. PLoS ONE 7(4): e33479
Distribution This species was described from Vietnam. It occurs in the tropical Western Pacific Ocean from Australia to the PhilippinesRudman, W.B., 1999 (October 17) Chromodoris coi (Risbec, 1956). [In] Sea Slug Forum. Australian Museum, Sydney. and rarely as far East as the Marshall Islands.Scott Johnson (2015) Goniobranchus coi. [In] Underwater Kwajalein
Description Goniobranchus coi has a white body and foot, but is instantly recognizable by its distinct dorsal pattern. The outer part of the mantle is yellow, separated from the inner light-brown part by a wavy white and black line. The outer edge of the mantle is brown, with a thin purple line at the margin. The gills and rhinophores range in colour between different individuals from translucent white, through pale-yellow and light-brown. This species reaches at least 50 mm in length.Rudman W.B. (1987) The Chromodorididae (Opisthobranchia: Mollusca) of the Indo-West Pacific: Chromodoris epicuria, C. aureopurpurea, C. annulata, C. coi and Risbecia tryoni colour groups. Zoological Journal of the Linnean Society 90: 305-407. page(s): 395Debelius, H. & Kuiter, R.H. (2007) Nudibranchs of the world. ConchBooks, Frankfurt, 360 pp. page(s): 143Gosliner, T.M., Behrens, D.W. & Valdés, Á. (2008) Indo-Pacific Nudibranchs and seaslugs. A field guide to the world's most diverse fauna. Sea Challengers Natural History Books, Washington, 426 pp. page(s): 215
Ecology Like most sea slugs in the superfamily Doridoidea, Goniobranchus coi feeds on sponges. It has been seen feeding on the sponge Chelonaplysilla violacea.Lau, A, 2005 (Dec 15) Chromodoris coi & sponges. [Message in] Sea Slug Forum. Australian Museum, Sydney.
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