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The above pictures show the colour variants of the ridges in this species, ranging from thin orange to broad orange-red. This specimen is upon its egg mass. I have seen specimens at the Maldive Islands with broad pale orange ridges.
More information on Halgerda tessellata are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 23 July 2017, Halgerda tessellata (Bergh, 1880)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Halgerda_tessellata.htm