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This species is Trapania sp. 7 in IPN, page 140, the picture was copied from Michael D. Miller's Slugsite with the kind permission of the photographer
Gerd Felix Cremer, who wrote "The color is more intensive blue as the picture shows."
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.