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Heteropod, Sea Elephant 6-15-17-6192.jpg

Sea Elephant, Pterotracheoidea , Black Water diving over Gulfstream Current; Florida Atlantic Diving; Plankton; SE Florida Atlantic Ocean off West  Palm Beach; larval fish; marine life; pelagic creatures; pelagic larval marine life; vertical migration marine creatures, The Pterotracheoidea is, according to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), a taxonomic superfamily of sea snails or sea slugs, marine gastropod molluscs in the clade Littorinimorpha. They are commonly called heteropods or sea elephants.