Model of Dunkleosteus terrelli (fossil placoderm) (Late Devonian; Cleveland, Ohio, USA) 2 : 無料・フリー素材/写真
Model of Dunkleosteus terrelli (fossil placoderm) (Late Devonian; Cleveland, Ohio, USA) 2 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Dunkleosteus terrelli (Newberry, 1873) - model of a fossil fish skull from the Devonian of Ohio, USA. (public display, Cleveland Museum of Natural History, Cleveland, 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:Dunkleosteus terrelliGiant fish found in the Rocky River Valley.Dunkleosteus is the most commonly collected armored fish of the Ohio Shale. This is perhaps due to the massiveness of its dermal bones which resisted erosion longer than the thinner and more delicate elements of other genera.------------------Classification: Animalia, Chordata, Vertebrata, Placodermi, Arthrodira, DunkleosteidaeStratigraphy: Cleveland Shale Member, upper Ohio Shale, Famennian Stage, upper Upper DevonianLocality: northeastern Ohio, USA------------------See info. at:en.wikipedia.org/wiki/Dunkleosteus |
| 撮影日 | 2017-04-23 19:35:34 |
| 撮影者 | James St. John |
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