File:Phacops rana fossil trilobite (Silica Formation, Middle Devonian; quarry in Sylvania, northwestern Ohio, USA) 2 (15160612359).jpg
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[edit]DescriptionPhacops rana fossil trilobite (Silica Formation, Middle Devonian; quarry in Sylvania, northwestern Ohio, USA) 2 (15160612359).jpg |
Phacops rana (Green, 1832) fossil trilobite from the Devonian of Ohio, USA. 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). Here's a famous trilobite species whose remains are relatively common in the Middle Devonian-aged Silica Formation of northeastern Ohio. This is Phacops rana (Green, 1832) (some place the species in "Eldredgeops", an unnecessary name based on insufficiently justified genus-level taxonomic splitting). Phacops trilobite fossils occur with other typical Middle Paleozoic shallow marine invertebrates: brachiopods, bryozoans, crinoids, and corals. This Phacops rana specimen is enrolled - many trilobites were capable of this. Enrollment allowed trilobites the opportunity to survive temporary, disruptive, high-energy events or burial events (for example, storms). Classification: Animalia, Arthropoda, Trilobita, Polymerida, Phacopidae Stratigraphy: Silica Formation (Silica Shale), Middle Devonian Locality: quarry in Sylvania, northwestern Ohio, USA |
Date | |
Source | Phacops rana fossil trilobite (Silica Formation, Middle Devonian; quarry in Sylvania, northwestern Ohio, USA) 2 |
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@N05/15160612359 (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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current | 18:57, 7 December 2019 | ![]() | 1,069 × 982 (980 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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File change date and time | 13:19, 25 July 2019 |
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Date and time of digitizing | 13:28, 31 May 2008 |
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Date metadata was last modified | 09:19, 25 July 2019 |
Unique ID of original document | uuid:61D3DCF445CE11E4BE44BC0E70191821 |
Copyright status | Copyright status not set |
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