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Though Bill Rudman has at the Sea-Slug Forum pictures of possible specimens of Ceratosoma magnificum (Eliot, 1910) [Miamira] from the Red Sea e.g the Western Indian Ocean and one from KwaZulu-Natal, South Africa (Eliot's preserved specimen was from the Seychelles), which look completely different from Miamira flavicostata Baba, 1940, it seems to be the accepted consense that Miamira flavicostata Baba, 1940 is a synonym of Ceratosoma magnificum (Eliot, 1910) [Miamira], just as IPN writes.
Today (13 May 2012) I realized that Johnson & Gosliner (2012) and WoRMS list Miamira flavicostata Baba, 1940 as valid, e.g. most of the pictures of Ceratosoma magnificum at the web are misidentified and show Miamira flavicostata.
I changed it on 29 Jan. 2011 into Ceratosoma cf. sinuatum (van Hasselt, 1824) [Doris] because it clearly differs from all pictures of Ceratosoma magnificum (Miamira flavicostata) at the web, but it also differs from Miamira sinuata by the almost complete lack of white markings at the rhinophores and gills. - cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Miamira sinuata or perhaps something closely related, or at least similar in appearance.
Bill Rudman's comment on this specimen.:
"This is precisely the reason I left them all as 'one species' for 10 years. While there are extremes which fit the various names very well, there seem to be a lot of intermediates. If there is more than one species I suspect this is C. magnificum. If this is the case, then this species is not restricted to the western Indian Ocean."
A somehow similar specimen from Taiwan is at NUDIPIXEL identified by Richard Willan as Ceratosoma sinuatum.
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 Ceratosoma cf. sinuatum to the reerected ("rescued from synonymy") genus Miamira Bergh, 1875.
More information on Miamira sinuata as Ceratosoma sinuatum are on Bill Rudman's Sea-Slug Forum!
At this site discusses Bill Rudman "Is Ceratosoma magnifica (Elliot, 1910) a good species?"