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Helicoprion is a genus of extinct shark-like [1] eugeneodont fish. Almost all fossil specimens are of spirally arranged clusters of the individuals' teeth, called "tooth whorls", which in life were embedded in the lower jaw. As with most extinct cartilaginous fish, the skeleton is mostly unknown.
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.
They are characterized by the presence of tooth whorls. They include iconic genera, such as Helicoprion (buzz-saw shark), Ornithoprion, Edestus or Caseodus. Fadenia 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. It could reach about 1.5 metres (4. ...
Among the eugeneodonts, some members of the superfamily Edestoidea are probably the largest marine animals of their time, with the Late Carboniferous Edestus estimated to reach about or exceeding 6.7 metres (22 ft) in length, [6] [7] with some Early Permian Helicoprion suggested to be over 7.6 metres (25 ft) long by some estimates [8] (though ...
Sereno said he has seen fossils up for sale at an auction claiming to be from Niger, except there is a national law in Niger making it illegal to sell fossils -- meaning either the fossil was ...
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.
The fossils were first uncovered during the school’s modernization project, which began in 2022. The first find was unearthed in June 2022 beneath the school’s main courtyard, ...
A new fossil revealing the complete side view of Ptychodus measured nearly 1.5 meters (about 5 feet) in length, suggesting it was from was of a much smaller shark.