Aldisa albatrossae

Described from Seragaki, Okinawa, Japan, this demersal nudibranch has a wide distribution in the tropical Pacific region. It has been found at depths between 3 and 72 m, in diverse places: Okinawa, the Philippines and North Sulawesi.^[3]

Aldisa albatrossae is a rather small nudibranch, with a length between 11 and 22 mm. The bluish gray dorsum is covered with many white, round tubercles. Typically there is a black line which starts in front of the rhinophores, and continues in a rectangular shape to the gills at the back. This black line then encompasses the gills. There are also yellow-orange markings on the corners of the rectangle. The lamellate rhinophores have a translucent, dirty-white color. The bipinnate gills only have a few branches, and have the same dirty white color.^[4][5] It is believed to mimic species of Phyllidiella and shares this characteristic with some other species of Aldisa such as Aldisa williamsi, Aldisa erwinkoehleri and unrelated dorid nudibranchs such as Paradoris liturata.^[1][6]