Goniodoris cf. castanea
Alder & Hancock, 1845
Goniodoris castanea is known from the Atlantic coast of nthn Europe. There are a number of possible records of this species from ports worldwide, the suggestion being that it is transported on the bottom of shipping. Further anatomical studies are needed to sort out this puzzle. I have attached photos of animals from outside the Atlantic which look like G. castanea.
See also Goniodoris meracula.
• Alder, J. & Hancock, A. (1845). Notice of a new genus and several new species of nudibranchiate Mollusca. Annals & Magazine of Natural History, 16: 311-316.
Rudman, W.B., 2002 (February 20) Goniodoris cf. castanea Alder & Hancock, 1845. [In] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/factsheet/gonicfcast