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The variant with the star-like white patch was described as Berthella stellata var. albocrossata Heller & Thompson, 1983
It has a world-wide geographical distribution, excluding very cold waters.
Thanks for identification of this specimen to Terrence M. Gosliner, USA
More information on Berthella stellata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 16 July 2016, Berthella stellata (Risso, 1826)
available from http://www.Philippine-Sea-Slugs.com/Pleurobranchomorpha/Berthella_stellata.htm