This is an unusual little dorid for a snorkeller to find but both of the animals documented here were found in the upper intertidal during extremely high fall tides. They can range in colour from a very light yellow to a dark orange and can be easily mistaken for the Aldisa sanguinea or Blood Spot Aldisa. The Blood Spot Aldisa of the Salish Sea and British Columbia are usually found without the dark spots on the back, so a small dorid with noticeable series of dots down the centre of the notum does usually signal the find of a Cooper’s Aldisa.
