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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.
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The fake photo. Helicopter Shark is a composition of two photographs that gives the impression that a great white shark is leaping out of the water to attack military personnel climbing a suspended ladder attached to a Special Forces UH-60 Black Hawk helicopter.
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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