Goniobranchus geminus

Goniobranchus geminus, also known as the gem sea slug[3] or twin sea slug[by whom?], is a species of very colorful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.[2]


The gem sea slug can reach a maximum size of 5 cm in length.[4] it has four distinctive color lines around the mantle edge.Starting from a thin white outer line,then a light grayish line, followed by another white line and finally a bright golden yellow line. The background coloration from the back is light brown to yellowish speckled with mauve ocelli circled with white margin. The foot, clearer and with a white margin, has also ocelli. Rhinophores are yellow or purple and laminated, gills are white outlined with beige.

Distribution & habitat[edit]

This sea slug lives in the Indian Ocean and in the Red Sea and has a predilection for coral reef's the external slopes.[5] Its diet consists mainly of specific sponges.

Similar species[edit]

  • Goniobranchus kuniei (Pruvot-Fol, 1930).
  • Chromodoris leopardus (Rudman, 1987).
  • Risbecia tryoni (Garrett, 1873).
  • Chromodoris tritos (Yonow, 1994).


  1. ^ 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. doi:10.1111/j.1096-3642.1987.tb01357.x
  2. ^ a b Bouchet, P. (2012). Goniobranchus geminus. Accessed through: World Register of Marine Species at on 2012-05-03
  3. ^ King, Dennis; Fraser, Valda (2014). The Reef Guide: fishes, corals, nudibranchs and other invertebrates (of the) East and South Coasts of Southern Africa. Cape Town: Struik Nature. p. 316. ISBN 9781775840183. 
  4. ^
  5. ^

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