Exquisitely-Preserved Viper Fish Soft Tissue Preservation Name: Eurypholis boissieri (viper fish) Geological Time: Middle Cretaceous, Cenomanian Stage million years ago) Size mm = 1 inch): 87 mm long on a 137 mm by 70 mm matrix Fossil Site: Leban
Helicoprion is a long-lived genus of extinct, eugeneodontid holocephalid fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls." This fossilized jaw shows the spiral dentures.
This cranky fish, Xiphanctinus (Portheus) Molossus, once swam in the sea that covered much of present-day Kansas. From Sunday Snapshot: Fossils at the KU Natural History Museum by Diana Staresinic-Deane