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Cratena cf. lineata B (Eliot, 1905) [Hervia]

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cf. is an abbreviation from a Latin word (confer) and means 'refer to' or 'compare with', here it means it could possibly be Cratena lineata or perhaps something closely related, or at least similar in appearance.
Cratena cf. lineata B is characterized by its opaque white longitudinal lines on the cerata and on the body. The long oral tentacles are translucent in the basal quarter, the apical three quarters are opaque white. The smooth rhinophores are basal translucent, followed by an opaque white region, the apex is translucent. The digestive glands in the cerata vary from translucent, to yellowish-tan to maroon.
It differs from Cratena lineata by the lack of orange/red patches in front of the rhinophores.
It differs from Cratena cf. lineata A by the opaque white longitudinal lines on the notum, and by the lack of orange/red patches in front of the rhinophores.
Let me quote IPN: "Additional study is needed to determine whether individuals without lines on the notum represent a distinct species." I think this includes individuals without orange/red patches in front of the rhinophores...
Pretty similar is also Cratena sp. 01 which lacks the opaque white longitudinal lines on the notum.
Reference:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs.
Sea Challengers Natural History Books. Gig Harbor, Washington. 426pp.
More informations on Cratena lineata are at Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 11 August 2016, Cratena cf. lineata B (Eliot, 1905)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Cratena_lineata_cf_B.htm