Trinchesia beta

Trinchesia beta is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Trinchesiidae.

Distribution
This species was described from the vicinity of the Noto marine laboratory, Ogi, Toyama Bay with additional specimens from Kannonzaki and Tsukumo Bay, Hosu-gun, Noto-cho, Noto Peninsula, Ishikawa Prefecture, Japan. It is also reported from Kurasaki Beach, Amami Ōshima.

Description
The typical adult size of this species is 4–10 mm.