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"My guess is that this aeolid is an undescribed tropical species of Cumanotus. The points that match are:
Short yet broad body;
Long smooth rhinophores;
Enlarged front of foot with rounded anterior border;
Very long and slender cerata with uniformly narrow digestive diverticulum internally.
The family for Cumanotus is not resolved at present. Some workers place it in Flabellinidae, whilst others place it in its own family Cumanotidae."
I follow WoRMS and place it in the family Flabellinidae Bergh, 1889.
Species of the genus Cumanotus are usually found in temperate (cold) waters of
Northeastern Atlantic Ocean, Cumanotus beaumonti,
Mediterranean Sea, Cumanotus beaumonti,
Eastern Atlantic Ocean, Cumanotus beaumonti, Cumanotus cuenoti, or
Northeastern Pacific Ocean, Cumanotus fernaldi, Cumanotus sp.
How to cite:
Köhler, E. (2016), published 15 August 2016, Cumanotus sp. 01 Genus: Odhner, 1907
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Dexiarchia/Cumanotus_sp_01.htm