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To my knowledge is this the only picture of this species, it is not in IPN nor Gosliner et al. (2015) .
Pretty similar are
Costasiella sp. 01which has also a black patch behind the rhinophores, it differs by the solid white rhinophores and lacks the subapical orange ring on the cerata, and lacks the minute orange and blue spots on the head.
Costasiella sp. 05which differs by the rhinophores, basally opaque white, the outer 2/3rds are black with a diffuse median whitish patch, and lacks the minute orange and blue spots on the head.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
Gosliner, T.M, D.W. Behrens & Á.Valdés. 2015. Nudibranch & Sea Slug Identification Indo-Pacific.
New World Publications Inc. Jacksonville, FL. 408 pp.
How to cite:
Köhler, E. (2017), published 18 June 2017, Costasiella sp. 02 Genus: Pruvot-Fol, 1951
available from https://www.Philippine-Sea-Slugs.com/Sacoglossa/Costasiella_sp_02.htm