Protitanichthys sp. (fossil fish) (Silica Formation, Middle Devonian; quarry northwest of Paulding, Ohio, USA) 5 : 無料・フリー素材/写真
Protitanichthys sp. (fossil fish) (Silica Formation, Middle Devonian; quarry northwest of Paulding, Ohio, USA) 5 / 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 | Protitanichthys sp. - fossil fish from the Devonian of Ohio, USA. (Dave Mielke collection; temporary public display, Ohio Geological Survey, Columbus, Ohio, USA)The semicircular structure at left is an eye.-----------------------------------From exhibit signage:Arthrodires were a type of placoderm, early jawed fishes that became extinct before the end of the Devonian Period. The head and thoracic area of arthrodires and other placoderms were covered with a mineralized armor, while the rest of the body was naked or covered with scales. Some arthrodires grew quite large, like Dunkleosteus, which probably exceeded six meters in length and was the terror of Devonian seas.Protitanichthys sp.A nearly complete armored head shield of a large arthrodire placoderm fish. This individual Protitanichthys was probably about four feet in length. (quite rare)-----------------------------------Classification: Animalia, Chordata, Vertebrata, Placodermi, Arthrodira, CoccosteidaeStratigraphy: Silica Formation (also known as the Silica Shale), Givetian Stage, upper Middle DevonianLocality: quarry northwest of the town of Paulding, northern Paulding County, northwestern Ohio, USA (41° 10' 52.55" North latitude, 84° 37' 19.32" West longitude)-----------------------------------See info. at:en.wikipedia.org/wiki/Protitanichthysanden.wikipedia.org/wiki/Arthrodiraanden.wikipedia.org/wiki/Placodermi |
| 撮影日 | 2019-07-17 13:29:14 |
| 撮影者 | James St. John |
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