Slender Sapsucking Slug

Thuridilla gracilis is a species of sea slug, a sacoglossan, a marine gastropod mollusk in the family Plakobranchidae. It is an Indo-Pacific species that lives in or near coral reefs and eats algae. Description This species can be up to 25 mm in size. The body is partially covered by the fold of the lateral parapodia. Th... Read more in Seabook