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Halgerda tessellata (Bergh, 1880) [Dictydoris]

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Halgerda tessellata is characterized by the pattern of yellowish-brown-orange flattened ridges over the mantle, the spaces in between are dark brown with opaque white spots.
I have posted more pictures than usual to show the colour variants of the ridges in this species, ranging from thin orange to broad orange-red, and to show this specimen upon its egg mass. I have seen specimens from the Maldive Islands with broad pale orange ridges
More information on Halgerda tessellata are on Bill Rudman's Sea-Slug Forum!