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Goniobranchus fidelis

Goniobranchus fidelis, also commonly known as the faithful sea slug, is a species of colorful sea slug, a dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae.[1][2]

Goniobranchus fidelis. Back part of the right.


The faithful sea slug can reach more than 25 mm length.[3] The body of the animal can be described in two distinct parts: the foot and the mantle. The foot is stretched and almost covered by the edges of the wide mantle, it is cream color. The color pattern of the mantle is marked by a creamy white area with scalloped edges. The whole wide margin of the mantle is orange to red, a burgundy like border, with a variable thickness from one animal to the other, delimits the two colored areas.[4] The rhinophores are laminated, contractile and grayish color, whose intensity varies from one animal to another with lighter color at the tip. Gills have the same color as the rhinophores but against they are retractable.

Distribution & Habitat[edit]

Distribution of Goniobranchus fidelis include tropical Indo-West Pacific and Red Sea.[5] Its habitat is the external reef area as well on the top or on the slope up to 20 m deep with a preference for dead corals.[6]


This sea slug is benthic and diurnal, moves without any fear of being taken for a prey, because of the presence of defensive glands distributed in its body tissues and shown to the potential predators through its warning coloration.


  1. ^ a b Bouchet, P. (2012). Goniobranchus fidelis. Accessed through: World Register of Marine Species at on 2012-05-02
  2. ^ Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdes A. & Warén A. 2005. Classification and nomenclator of gastropod families. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. ISBN 3-925919-72-4. ISSN 0076-2997. 397 pp.
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  5. ^ "Chromodoris fidelis (Kelaart, 1858)". Sea Slug Forum, accessed 15 December 2010.
  6. ^

Further reading[edit]


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Source: Wikipedia

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