AppearanceThe length is up to 40 cm. The color is often black or dark brown with an orange or red line.
DistributionThis sea hare occurs in the Western Atlantic from New Jersey to Brazil, and in the Eastern Atlantic including the Mediterranean and the West African coast. It is a rare visitor to the seas off the southern British Isles .
Some consider the species ''Aplysia brasiliana'', found in the Atlantic coast of the Americas, to be a synonym of ''Aplysia fasciata'' with just a different regional colour pattern.
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