File:Onychodus sigmoides fossil fish jaw in fossiliferous limestone (Middle Devonian; Ottawa County, Ohio, USA) 1 (27268016272).jpg

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Onychodus sigmoides Newberry, 1857 fossil fish jaw in fossiliferous limestone from the Devonian of Ohio, USA. (CMC VP 14459, Cincinnati Museum of Natural History and Science, Cincinnati Museum Center, Cincinnati, Ohio, USA)

This is the dentary bone of an Onychodus fossil fish. The dentary is the anterior bone of the lower jaw - note that the teeth are still in place. The host rock is marine fossiliferous limestone. The light-colored, tapered structures above and below the jaw in the right half of the photo are tentaculite shells.

Classification of Onychodus: Animalia, Chordata, Vertebrata, Osteichthyes, Sarcopterygii, Onychodontida, Onychodontidae

Classification of tentaculite shells: Animalia, Mollusca (?), Tentaculita, Tentaculitida, Tentaculitidae

Stratigraphy: Columbus Limestone or Delaware Limestone, Middle Devonian

Locality: undisclosed locality in Ottawa County, northwestern Ohio, USA

More info. at:

<a href="https://en.wikipedia.org/wiki/Onychodus" rel="nofollow">en.wikipedia.org/wiki/Onychodus</a>
Date
Source Onychodus sigmoides fossil fish jaw in fossiliferous limestone (Middle Devonian; Ottawa County, Ohio, USA) 1
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@N05/27268016272 (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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current18:58, 7 December 2019Thumbnail for version as of 18:58, 7 December 20194,000 × 2,505 (5.07 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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