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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 Ceratophyllidia africana or perhaps something closely related, or at least similar in appearance.
Let me quote the Sea-Slug Forum: " When disturbed the animal is able to break off the tubercles so often animals can be found with a mixture of large and small (growing) tubercles which are replacing ones which have been broken off. Specimens in collections often have only a few or no tubercles."
IPN lists 3 undescribed species of Ceratophyllidia, Gosliner et al. (2015) lists 4 Ceratophyllidia sp., in the latter are the above specimens #4. I will keep them as Ceratophyllidia cf. africana until further studies are published.
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.
Terrence M. Gosliner, Ángel Valdés & David W. Behrens 2015. Nudibranch & Sea Slug Identification Indo-Pacific.
New World Publications Inc., Jacksonville, Florida
More information on Ceratophyllidia spp. are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 14 February 2017, Ceratophyllidia cf. africana Eliot, 1903
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Doridina/Ceratophyllidia_africana_cf.htm