File:Triarthrus eatoni (fossil trilobite) (Utica Shale, Upper Ordovician; Lewis County, New York State, USA).jpg

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English: Triarthrus eatoni (Hall, 1838) - trilobite cranidium in black shale from the Ordovician of New York State, USA. (shale is ~3.85 centimeters across at its widest)

Trilobites are extinct marine arthropods. They first appear in Lower Cambrian rocks and the entire group went extinct at the end of the Permian. Trilobites had a calcitic exoskeleton and nonmineralizing parts underneath (legs, gills, gut, etc.). The calcite skeleton is most commonly preserved in the fossil record, although soft-part preservation is known in some trilobites (Ex: Burgess Shale and Hunsruck Slate). Trilobites had a head (cephalon), a body of many segments (thorax), and a tail (pygidium). Molts and carcasses usually fell apart quickly - most trilobite fossils are isolated parts of the head (cranidium and free cheeks), individual thoracic segments, or isolated pygidia. The name "trilobite" was introduced in 1771 by Johann Ernst Immanuel Walch and refers to the tripartite division of the trilobite body - it has a central axial lobe that runs longitudinally from the head to the tail, plus two side lobes (pleural lobes).

Classification: Animalia, Arthropoda, Polymerida, Olenidae

Stratigraphy: Utica Shale (sensu traditio), Upper Ordovician

Locality: unspecificied/unrecorded site in Lewis County, northern New York State, USA
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Source https://www.flickr.com/photos/47445767@N05/49071480913/
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/49071480913. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

13 October 2020

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current01:54, 13 October 2020Thumbnail for version as of 01:54, 13 October 20202,367 × 1,398 (1.95 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49071480913/ with UploadWizard

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