Diacria trispinosa is a holoplanktonic species of gastropods belonging to the family Cavoliniidae.

As the larva grows into its adult stage it moves into the teleoconch, then a membrane is formed between the two and the protoconch is shed.

[1][6] Fossils of D. trispinosa have been found in the Hopegate Formation in Jamaica from as early as the Upper Pliocene.

Remains have been found from as early as the Cretaceous period,[2] although their shells are often not fully preserved due to their proclivity to dissolve in aragonite.

[4] They exhibit a vertical migration pattern, and are found in shallower waters during the night than during the day.