Barnacles and Copepods; Maxillopoda

Most of the Barnacles look externally rather like a small, limpet style of sea snail with a hole in the top, but they are actually non-moving, filter-feeding crustaceans.
Totally different are the Copepods – tiny creatures, rarely seen on scuba dives because they are so small, photographed here as parasites on a Phyllidid Nudibranch and a Hypselodorid as well as hanging out on an unidentified sponge and an algae.

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