Menaspis vs Edestus
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Menaspis
Menaspis is an extinct genus of holocephalian cartilaginous fish from the Permian period. Fossils are known from Europe, including the Kupferschiefer deposits, and show a distinctive head region with bony or mineralized armor associated with the skull. Although it is sometimes grouped informally with fossil sharks, Menaspis is a holocephalian, placing it on the cartilaginous-fish branch that also...
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Edestus
Edestus is an extinct genus of eugeneodontid holocephalan fish that lived during the Late Carboniferous period, with fossils found in regions including the United States, Russia, and the United Kingdom. The genus is distinguished by its unique tooth whorls, which projected outward from its jaws and functioned much like a pair of pinking shears or scissors. Unlike modern sharks, its teeth did not f...
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