Pycnodontiformes

Pycnodontiformes is an extinct order of primarily marine bony fish. The group first appeared during the Late Triassic and disappeared during the Eocene. The group has been found in rock formations in Africa, Asia, Europe, North and South America.

Pycnodontidae is an extinct family of ray-finned fishes, ranging from the Jurassic period until the Late Eocene. It was the largest and most derived family of the successful Mesozoic fish order Pycnodontiformes, and one of only two families (alongside the Serrasalmimidae) to survive into the Cenozoic.

Gebrayelichthyidae is a family of extinct pycnodontid fish, with a superficially shrimpfish-like appearance that lived during the lower Cenomanian.

Gebrayelichthys is a genus of pycnodontiform fish of the family Gebrayelichthyidae. It comprises two species, Gebrayelichthys uyenoi and Gebrayelichthys verticalis. Their extremely deep body shape is unique among known fishes, only comparable to some Paleogene tetraodontiformes, and suggests an ostraciiform locomotion.

Coccodontidae is a family of extinct pycnodontid fish that lived during the lower Cenomanian. The various genera had massive, curved spines.