The sidegill slugs have a large plume-like gill located
the well developed foot and overlapping mantle, usually on the right side of the body
Medium or large oblong-shaped slugs which have two well developed cylindrical rhinophores on the head and two oral tentacles attached to either side of an oral veil.
The majority of families have an internal shell, others an external shell, and one family has even lost its shell completely
Notaspideans are exclusively carnivorous and utilize strong jaws and a broad radula to scrape tissue from their sponge or tunicate prey.
Photo : Berthellina martensis