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Tiny Cavolinia pteropod, less than 1 cm floating in the water column, seen during a night dive. This planktonic mollusc is commonly known as a pteropod, or flapping snail, a name derived from its characteristic 'wing foot'. It possesses a globose, bilaterally symmetrical calcareous shell that houses and protects the soft parts of the organism. The large mantle lobes extend beyond the shell margin and, by a flapping motion, enable movement. Feeding is performed passively whilst drifting in the plankton community by casting a large, mucous web in order to catch a variety of phytoplankton (diatoms and dinoflagellates) and zooplankton (copepods and crustacea larvae). This picture is a Sea Butterfly from the genus Cavolinia, possibly Cavolinia tridentata.