Goniobranchus geminus
Goniobranchus geminus, also known as the gem sea slug, is a species of very colourful sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Chromodorididae.
Taxonomic history
Until 2012 this species was known as Chromodoris geminus but was moved to the genus Goniobranchus as a result of a molecular study.Description
Goniobranchus geminus can reach a maximum size of 5 cm in length.It has four distinctive coloured 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 a white margin.
The foot, clearer and with a white margin, also has ocelli.
The rhinophores are yellow or purple and laminated, gills are white outlined with beige.