Dermatobranchus arminus is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Arminidae.
Thie size of this marine species attains 20 mm.
This species is small-bodied, with opaque white ridges along the body marked by dark brown blotches. The body is pale with faint brown saddle-like markings. The rhinophores (chemosensory tentacles) are small, oval, and have longitudinal ridges. [1]
Color: Pale-bodied, indistinctly brown saddled nudibranch with raised opaque white longitudinal ridges having dark blotches along them.
This species was described from Bakoven on the Atlantic Coast of Western Cape Province, South Africa, usually deeper than 20 m.