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Pteropod, Diacria trispinosa 6-9-16-173.jpg

Pteropod, Diacria trispinosa,Thecosoma  (Niebuhr, 1775) Phylum Mollusca / Class Gastropoda / Subclass Opisthobranchia / Order Thecosomata / Family Cavoliniidae, Opisthobranchs in the Suborder Euthecosomata, which includes the cavoliniids, all have a calcareous shell.