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Haplophrentis1
Haplophrentis was a tiny shelled hyolithid that lived during the Cambrian period.

Haplophrentis had a long, flat-bottomed, conical shell housing the body, a small lid (operculum) closing the front end, and two curved appendages sticking out sideways, like props, at the front. They probably acted as struts or stabilizers to keep the body from rolling around sideways in the currents. They may have also worked like oars, sculling the creature slowly along the bottom as it fed on organic stuff in the mud.

Haplophrentis was really small between 2–6 cm (0.79-2.36 inches) in length.

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