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This is one of the rarest species of nudibranchs, originally described from the Mediterranean (Naples) and only observed twice in the Atlantic (Canarias and Portugal). The name "sphaeriferus" alludes to the emerald green "spheres" seen in the interior of the basal portion of the cerata.
Originally reported to feed on Obelia sp. hydroids, latest confirmed observations from the Adriatic suggests it may also feed on the scyphopolyps of Aurelia aurita.
15 meters deep.
Spotted on Aug 27, 2011
Submitted on Mar 23, 2015