File:Holonema sp. (fossil fish armor) (Silica Formation, Middle Devonian; quarry northwest of Paulding, Ohio, USA) (48320253237).jpg

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Holonema sp. - fossil fish armor from the Devonian of Ohio, USA. (Dave Mielke collection; temporary public display, Ohio Geological Survey, Columbus, Ohio, USA)

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.

Classification: Animalia, Chordata, Vertebrata, Placodermi, Arthrodira, Holonematidae

Stratigraphy: Silica Formation (also known as the Silica Shale), Givetian Stage, upper Middle Devonian

Locality: 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: <a href="https://en.wikipedia.org/wiki/Holonema" rel="noreferrer nofollow">en.wikipedia.org/wiki/Holonema</a> and <a href="https://en.wikipedia.org/wiki/Arthrodira" rel="noreferrer nofollow">en.wikipedia.org/wiki/Arthrodira</a> and

<a href="https://en.wikipedia.org/wiki/Placodermi" rel="noreferrer nofollow">en.wikipedia.org/wiki/Placodermi</a>
Date
Source Holonema sp. (fossil fish armor) (Silica Formation, Middle Devonian; quarry northwest of Paulding, Ohio, USA)
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/48320253237 (archive). It was reviewed on 18 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 October 2019

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current02:39, 18 October 2019Thumbnail for version as of 02:39, 18 October 20193,083 × 2,294 (4.82 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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