File:Dunkleosteus tooth scrape mark on a Dunkleosteus skull bone.jpg
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English: Dunkleosteus terrelli (Newberry, 1873) - fossil fish skull bone (real) from the Devonian of Ohio, USA. (CMC VP7143, Cincinnati Museum of Natural History & Science, Cincinnati, Ohio, USA)
The placoderms are a group of extinct, mostly predatory fish that existed during the Middle Paleozoic (Silurian and Devonian). The most famous placoderm was Dunkleosteus, which was named after David Dunkle, an Ohio paleontologist. It was not a shark - it had a bony skull, a neck joint, and remarkably, the jaws lacked true teeth. Instead, the jawbones were sharp-edged and pointed. From museum signage: The marks on the median dorsal plate of this specimen of Dunkleosteus (see arrow) were made by a formidable predator, most likely another Dunkleosteus with jaws capable of crushing the hard plates that form the head and thoracic shield of these large predatory fish. Classification: Animalia, Chordata, Vertebrata, Placodermi, Arthrodira, Dunkleosteidae Stratigraphy: Cleveland Shale Member, upper Ohio Shale, Famennian Stage, upper Upper Devonian Locality: Vermillion River, Lorain County, northeastern Ohio, USA See info. at: en.wikipedia.org/wiki/Dunkleosteus |
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| Source | https://www.flickr.com/photos/jsjgeology/34099965891/ |
| Author | James St. John |
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