Click the thumbnail photos to enhance!
This picture of 2 specimens was a bycatch of a picture of Unidentia angelvaldesi Millen & Hermosillo, 2012.
Cratena affinis looks somehow similar to
Cratena lineata, which differs by white lines on the notum, and by smooth rhinophores.
Cratena cf. lineata A, which lacks white spots on the notum, and differs by smooth rhinophores.
There are better pictures of this species from Japan at seaslug.world and at umiushi-zukan.com, Robert F. Bolland has a picture of Baba's original drawing at his OKINAWA SLUG SITE.
More information on Cratena affinis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2016), published 1 September 2016, Cratena affinis (Baba, 1949)
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Cladobranchia/Cratena_affinis.htm