File:Cyrtoceratites ohioensis (fossil cephalopod) (possibly from the Columbus Limestone, Middle Devonian; Delaware County, Ohio, USA) (27263337798).jpg

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Cyrtoceratites ohioensis (Meek, 1871) - fossil cephalopod from the Devonian of Ohio, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

Nautiloids were relatively common components of Paleozoic oceans. They were basically a squid-in-a-shell. Most species had straight, slightly tapering shells, but some had loosely coiled or tightly coiled shells. The shells were mostly hollow, aragonitic, and had regularly-spaced internal walls. The entire group is represented in today's oceans by five living species of chambered nautilus, all of which have a coiled shell: Nautilus pompilius, Nautilus macromphalus, Nautilus stenomphalus, Nautilus belauensis, and Allonautilus scrobiculatus.

Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea, Oncocerida, Archiacoceratidae

Stratigraphy: probably the Columbus Limestone, Middle Devonian

Locality: unrecorded/undisclosed site in Delaware County, central Ohio, USA
Date
Source Cyrtoceratites ohioensis (fossil cephalopod) (possibly from the Columbus Limestone, Middle Devonian; Delaware County, 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@N05/27263337798 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

12 October 2019

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current04:31, 12 October 2019Thumbnail for version as of 04:31, 12 October 20193,820 × 1,964 (5.07 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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