It is found in rock pools in the intertidal zone and in shallow water in the tropical and subtropical Indo-Pacific region.

The head bears a triangular oral veil with a ventral groove, and a pair of rhinophores rolled into tubes.

The surface of the mantle is studded with small white glands which produce a distasteful whitish secretion.

[citation needed] Berthellina citrina is a common species found throughout the tropical and subtropical Indo-Pacific, and as far south as New Zealand.

[3] As well as being found in rock pools, it occurs on reefs and among boulders in the shallow subtidal zone, and down to a maximum depth of 150 m (500 ft).