About Aldisa smaragdina Ortea, Pérez & Llera, 1982
The scientific name of this species is Aldisa smaragdina Ortea, Pérez & Llera, 1982. The entire dorsum of this species is covered in raised, rounded tubercles. It has two darker, round markings on its back, and fully grown individuals reach a maximum length of 30 mm. This species was first described from specimens collected in the Canary Islands. After its original description, it has also been reported from the Atlantic coast of Spain and from Portugal. This nudibranch feeds on the hymedesmiid sponge Phorbas fictitius, which is also known by the synonym Anchinoe fictitius. The two darker round markings on the nudibranch's back closely resemble the inhalant pore sieves of Phorbas, which provides the nudibranch with excellent camouflage. A progesterone homologue has been isolated from this species.
