Search results
Results From The WOW.Com Content Network
The other family, which contains Helicoprion, is sometimes called Agassizodontidae, based on the genus Agassizodus. [4] [7] Other authors, though, prefer the family name Helicoprionidae, which was first used 70 years prior to Agassizodontidae. Helicoprionids (or agassizodontids) have large, cartilage-supported whorls with strongly arched shapes.
Helicoprionidae (sometimes referred to as Agassizodontidae) [2] is an extinct family of holocephalans within the order Eugeneodontida.Members of the Helicoprionidae possessed a "whorl" of tooth crowns connected by a single root along the midline of the lower jaw.
Comparison of S. changhsingensis and Helicoprion sp.. Sinohelicoprion (meaning "Chinese spiral saw" or "Chinese Helicoprion") is an extinct genus of helicoprinid eugeneodontid fish that lived during the late Permian and possibly the Early Triassic, from 254 to 251 million years ago.
Typically, members of this group had tooth whorls. Species of Helicoprion could reach between 5 and 8 m (16.5 and 26 ft) in size. Triodus: Triodus is a genus of xenacanthid cartilaginous fish. The order Xenacanthida existed during the Carboniferous to Triassic period, and is well known from many complete skeletons from the early Permian.
Helicoprion bessonovi, teeth at the front of the lower jaw (reversed for more natural position) Restoration of Romerodus (Caseodontidae). The Eugeneodontida, sometimes also called Eugeneodontiformes, is an extinct and poorly known order of cartilaginous fishes.
Top row, left to right: Dromia personata (Dromiidae), Dungeness crab (Cancridae), Tasmanian giant crab (Menippidae); Middle row: Corystes cassivelaunus (Corystidae), Liocarcinus vernalis (Portunidae), Carpilius maculatus (Carpiliidae); Bottom row: Gecarcinus quadratus (Gecarcinidae), Grapsus grapsus (Grapsidae), Ocypode ceratophthalmus (Ocypodidae).
Livyatan is an extinct genus of macroraptorial sperm whale containing one known species: L. melvillei.The genus name was inspired by the biblical sea monster Leviathan, and the species name by Herman Melville, the author of the famous novel Moby-Dick about a white bull sperm whale.
They are characterized by the presence of tooth whorls. They include iconic genera, such as Helicoprion ("buzz-saw shark"), Ornithoprion, Edestus or Fadenia. Caseodus is one of the few eugeneodontid genera that survived the end-Permian mass extinction event. It is one of the last surviving genera of this clade. [4]