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File:Dunkleosteus sp. (fossil fish jawbone) (Ohio Shale, Upper Devonian; Ohio, USA) (41295685835).jpg

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Dunkleosteus sp. - fossil fish lower jawbone (replica) from the Devonian of 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 (see above). Instead, the jawbones were sharp-edged and pointed.

From exhibit signage:

This replica of the right lower jawbone came from a Dunkleosteus estimated to be 15 feet long. Other individuals may have reached up to 30 feet. Instead of teeth, it had sharp blades of bone.

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

Stratigraphy: Ohio Shale, Upper Devonian

Locality: Ohio, USA

See info. at:

<a href="https://en.wikipedia.org/wiki/Dunkleosteus" rel="nofollow">en.wikipedia.org/wiki/Dunkleosteus</a>
Date
Source Dunkleosteus sp. (fossil fish jawbone) (Ohio Shale, Upper Devonian; 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@N05/41295685835 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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current19:07, 7 December 2019Thumbnail for version as of 19:07, 7 December 20193,804 × 1,440 (3.38 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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