About Aldisa sanguinea (J.G.Cooper, 1863)
Aldisa sanguinea, commonly known as the blood-spot dorid, is a species of dorid nudibranch sea slug. It is classified as a marine gastropod mollusk belonging to the family Cadlinidae. This species was first described from California. It has since been recorded along the western seaboard of North America, ranging from British Columbia in the north down to Mexico in the south. In the northern part of this range, specifically Oregon and British Columbia, some collected specimens lack the two characteristic round markings on the back. These markings resemble the inhalant pore sieves of Hymedesmiid sponges, and it is possible that these unmarked specimens actually belong to a separate species. This species feeds on a red sponge from the genus Hymedesmia.
