The lemon pleurobranch (Berthellina granulata) is a species of sea slug, a marine gastropod mollusc in the family Pleurobranchidae.
The lemon pleurobranch is a small smooth oval pleurobranch. The animal is yellow- to orange-coloured and often has white spots. There are two rolled rhinophores joined at their bases on the head. Like all other sidegill slugs, there is a single gill on the right hand side of the body.
The animal grows up to 40 mm in total length.[1]
This animal has been found off the whole southern African coast and is known throughout the Indo-Pacific to Hawaii.[2]
The species is thought to be a scavenger. Its egg mass is an upright orange collar of one whorl.