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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]
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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
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.
English: Jaw motion of Helicoprion, based on figures in Eating with a saw for a jaw: Functional morphology of the jaws and tooth-whorl in Helicoprion davisii in Journal of Morphology by Jason B. Ramsay, Cheryl D. Wilga, Leif Tapanila Jesse Pruitt, Alan Pradel, Robert Schlader, and Dominique A. Didier
Nicknamed 'Deep Blue,' this great white is almost as long as the 22-foot-long boat the researchers were aboard near Guadalupe, Mexico, nearly 165 miles away from mainland. She is one of the ...
Helicoprion postcrania is not fully known, but other eugeneodonts are known to have five or six shark-like gill slits, not a fleshy chimaera-like operculum. That may have simply been an over-correction based on the confirmation that eugeneodonts were holocephalans.
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