Orange-Edged Sapsucking Slug

Thuridilla lineolata 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 3 cm in size. The body is partially covered by the fold of the lateral parapodia. ... Read more in Seabook