Reticulidia fungia Brunckhorst & Gosliner in Brunckhorst, 1993
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Reticulidia fungia is characterized by yellow or pale ridges which
have a fine white border and by its broad blue-grey mantle margin.
Pretty similar is Reticulidia halgerda
which has numerous, narrow yellow ridges and an orange mantle margin.
More information on Reticulidia fungia are on
Bill Rudman's Sea-Slug Forum!