Hybodus vs Ptychodus
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Hybodus
Hybodus is an extinct genus of hybodont shark that lived from the Late Permian to the Late Cretaceous periods. Characterized by a robust body, two prominent dorsal fin spines, and a heterodont dentition adapted for a varied diet, it differed significantly in its body plan from modern sharks. Fossilized remains, including teeth and fin spines, have been discovered across multiple continents, making...
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Ptychodus
"Ptychodus" is an extinct genus of large durophagous shark that lived during the Late Cretaceous period. Historically known only from isolated, broad, and distinctly ridged teeth, the genus was definitively classified in 2024 following the discovery of complete fossilized skeletons in limestone deposits in Vallecillo, Mexico. These well-preserved specimens confirmed that the shark belonged to the...
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