Ischyrhiza
Encyclopedia
Ischyrhiza is an extinct genus of cartilaginous fish from the Cretaceous
and Paleogene
belonging to the primitive Batoidea
family Sclerorhynchidae
.
Cretaceous
The Cretaceous , derived from the Latin "creta" , usually abbreviated K for its German translation Kreide , is a geologic period and system from circa to million years ago. In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the...
and Paleogene
Paleogene
The Paleogene is a geologic period and system that began 65.5 ± 0.3 and ended 23.03 ± 0.05 million years ago and comprises the first part of the Cenozoic Era...
belonging to the primitive Batoidea
Batoidea
Batoidea is a superorder of cartilaginous fish commonly known as rays and skates, containing more than 500 described species in thirteen families...
family Sclerorhynchidae
Sclerorhynchidae
Sclerorhynchidae is an extinct family of cartilaginous fish from the Cretaceous and Paleogene belonging to the primitive Batoidea suborder Sclerorhynchoidea.-Sources:* accessed on 8/21/09...
.
Sources
- Fossils (Smithsonian Handbooks) by David Ward (Page 205)
- The Paleobiology Database accessed on 8/21/09