Eubranchus exiguus is a species of small sea slug, an aeolid nudibranch, a marine gastropod mollusc in the family Eubranchidae.

[4] Eubranchus exiguus was originally discovered and described (under the name Eolis exigua) in 1848, by the British malacologists Joshua Alder and Albany Hancock.

The body is also blotched and spotted with brown, and there is frequently an interrupted line of that colour on each side.

It is allied to Eolis despecta, some specimens of which were found in company with it, but it is easily distinguished by not having the waved dorsal line of the latter species.

we cannot concur in referring it to the Limax tergipes of Forskahl (Doris lacinulatus, Gmelin).The maximum recorded length is 8 mm.