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Pretty similar are:
Hypselodoris bullockii which differs by the pale pinkish background colour, and by thin white marginal band,
Thorunna halourga which differs by solid broad white mantle margin, and by the low gill pocket,
Hypselodoris variobranchia which differs by the light purple background colour, by the solid white marginal band, and by the colour of the gills and the rhinophores
Hypselodoris violacea which differs by the dark blueish-purple colour of the rhinophore clubs, by the solid broad white marginal band marginal band, and by the colour of the gills.
The specimen #1 was originally posted at these websites as Hypselodoris bullockii (Collingwood, 1881) [Chromodoris],
on 19 June 2003 changed into Hypselodoris apolegma (Yonow, 2001) [Risbecia],
on 12 Feb. 2010 changed into Risbecia apolegma Yonow, 2001, because of the comment of Nathalie Yonow at NUDIPIXEL,
I follow the recent article (published: 10 April 2012)
Rebecca Fay Johnson & Terrence M. Gosliner. 2012.
Traditional Taxonomic Groupings Mask Evolutionary History:
A Molecular Phylogeny and New Classification of the Chromodorid Nudibranchs. online at
and move Risbecia apolegma again to the genus Hypselodoris Stimpson, 1855.
More information on Hypselodoris apolegma are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2020), published 1 June 2020, Hypselodoris apolegma (Yonow, 2001)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Hypselodoris_apolegma.htm