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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.
Helicoprion bessonowi was first described in an 1899 monograph by Alexander Karpinsky. Although it was not the first Helicoprion species to be described, it was the first known from complete tooth whorls, demonstrating that Helicoprion was distinct from Edestus. [13] As a result, H. bessonowi serves as the type species for Helicoprion. [20]
[30] [33] A later study has proposed a most plausible total length of up to 7 meters (23 ft) for both Helicoprion and Parahelicoprion, and suggests that previous overestimations of Parahelicoprion's size were the result of assuming that the fossils were very small fragments of a Helicoprion-like spiral, rather than being nearly complete. [30]:
Edestus is an extinct genus of eugeneodontid holocephalian fish known from the Late Carboniferous (Pennsylvanian) of the United Kingdom, Russia, and the United States.Most remains consist of isolated curved blades or "whorls" that are studded with teeth, that in life were situated within the midline of the upper and lower jaws.
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Spawn: Armageddon is an action-adventure hack and slash video game released in 2003 for the PlayStation 2, Xbox and GameCube video game consoles. It is inspired by issues 1 through 99 of the Spawn comic book series.