File:Terebratalia transversa (brachiopod shell) (modern; offshore California, USA) 3.jpg

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Description
English: Terebratalia transversa (Sowerby, 1846) - brachiopod shell from California, USA. (view of ventral valve)

Seen here is a brachiopod, a group of 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).

Classification: Animalia, Brachiopoda, Articulata (a.k.a. Rhynchonelliformea), Terebratulida, Terebrataliidae

Locality: 65 feet depth, offshore from La Jolla, north of San Diego, far-southern California, USA

See info. at: en.wikipedia.org/wiki/Brachiopod and

en.wikipedia.org/wiki/Terebratulida
Date
Source https://www.flickr.com/photos/47445767@N05/50732686782/
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@N05/50732686782. It was reviewed on 18 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 December 2020

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