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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]
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 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.
Parahelicoprion is an extinct genus of shark-like cartilaginous fish that lived during the Early Permian.Two species are known ; P. clerci from Arta Beds of the Ural Mountains of Russia, and P. mariosuarezi from the Copacabana Formation of Bolivia.
Campyloprion teeth resemble those of Helicoprion, but the tooth whorl has an open spiral shape, more loosely coiled than that of Helicoprion. [2] The size of its teeth indicate a length of up to 9 m (30 ft), which would make it one of the largest animals of the Carboniferous period.
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English: Diagram of the "tooth whorl" of Helicoprion, showing the shape of the teeth, redrawn from figure 2 of "Saws, Scissors, and Sharks: Late Paleozoic Experimentation with Symphyseal Dentition" by Leif Tapanila Jesse Pruitt Cheryl D. Wilga Alan Pradel