While we originally considered this a possible young specimen of Cerberilla annulata, it may also be a young specimen of C. asamusiensis, known from Japan, Indonesia and the Philippines. The first photo shows a small 15mm specimen found on 18 June 2012 in a shallow lagoon Halimeda patch. Our specimen does not closely match those on the Sea Slug Forum, but it is quite close to one figured on the Slug Site.
When a second specimen was found on the Kwajalein Atoll seaward reef at night, it was initially seen hanging from a mucus thread from a ledge at a depth of about 26m.
Created 12 October 2015
Updated 1 March 2016