Hemicalypterus is an extinct genus of prehistoric ray-finned fish that lived during the late Triassic period (approx.

Fossils have been collected in the southwestern United States, including Utah and New Mexico.

[1] Hemicalypterus belonged to the family Dapediidae, and like other members of its family, it was a deep-bodied fish with a covering of thick ganoid scales.

It differed from other dapediids in lacking scales on the posterior part of the body, and in possessing unusual, multicuspid teeth.

This article about a prehistoric ray-finned fish is a stub.