File:Trimerella ohioensis (fossil brachiopod) (Lockport Dolomite, Middle Silurian; quarry in Ottawa County, Ohio, USA).jpg

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English: Trimerella ohioensis Meek, 1871 - fossil brachiopod in dolostone from the Silurian of Ohio, USA.

Brachiopods are sessile, benthic, filter-feeding, marine invertebrates. They first appear in Cambrian rocks and were abundant in Earth's oceans throughout the Paleozoic. They were also common in Mesozoic oceans, but are scarce in modern oceanic biotas. Brachiopods have two shells, called valves, that are usually calcareous (made of calcite - CaCO3 - calcium carbonate). Each shell of a brachiopod is bilaterally symmetrical, unlike each shell of a bivalve (clam).

This trimerellid brachiopod is an internal mold in dolostone - the original shell has dissolved away, leaving an impression of the shell's interior surface.

Classification: Animalia, Brachiopoda, Inarticulata (also referred to as Craniiformea), Craniata, Trimerellida, Trimerellidae

Stratigraphy: Lockport Dolomite, Niagaran Series, Middle Silurian

Locality: unrecorded quarry in Ottawa County, northern Ohio, USA
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Source https://www.flickr.com/photos/47445767@N05/52148547225/
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@N05/52148547225. It was reviewed on 15 November 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 November 2022

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current17:14, 15 November 2022Thumbnail for version as of 17:14, 15 November 20222,933 × 2,407 (3.75 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52148547225/ with UploadWizard

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