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Cratena sp. 02 lacks the orange-red paches at the sides of the head which are in many species of Cratena.
Pretty similar are:
Cratena sp. 03 which differs
- by the backgound colour: translucent with a whitish dorsal region,
- by the cerata, which are translucent orange with purple spots near the base, and have white apices and
- by the rhinophores, which are translucent orange, with bright orange apices, and one annula subapical.
Phidiana anulifera which differs
- by the cerata, which are dark grey with translucent apices
- by the rhinophores, which are basally translucent with opaque white spots, and have two whitish annulae near the apices
Maybe Cratena sp. 02 is an extreme variant of Cratena sp. 5 in IPN at page 397:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
The Sea-Slug Forum lists it as Cratena cf. affinis though it differs from Cratena affinis by the lack of orange-red paches at the sides of the head, and by the lack of opaque white lines at the cerata.
More information on Cratena sp 02 as Cratena cf. affinis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 11 August 2016, Cratena sp. 02 Genus: Bergh, 1864
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Cratena_sp_02.htm