File:Basidechenella lucasensis (fossil trilobite) (Silica Formation, Middle Devonian; quarry northwest of Paulding, Ohio, USA) 1 (48340432507).jpg
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[edit]DescriptionBasidechenella lucasensis (fossil trilobite) (Silica Formation, Middle Devonian; quarry northwest of Paulding, Ohio, USA) 1 (48340432507).jpg |
Basidechenella lucasensis Stumm, 1965 - fossil trilobite from the Devonian of Ohio, USA. (Dave Mielke collection; temporary public display, Ohio Geological Survey, Columbus, Ohio, USA) This species is also known as Dechenella lucasensis. 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). Seen here is a rare trilobite called Basidechenella lucasensis from the Middle Devonian-aged Silica Formation of northeastern Ohio. Silica Formation trilobites occur with other typical Middle Paleozoic shallow marine invertebrates: brachiopods, bryozoans, crinoids, and corals. Classification: Animalia, Arthropoda, Trilobita, Polymerida, Proetidae Stratigraphy: Silica Formation (also known as the Silica Shale), Givetian Stage, upper Middle Devonian Locality: quarry northwest of the town of Paulding, northern Paulding County, northwestern Ohio, USA (41° 10' 52.55" North latitude, 84° 37' 19.32" West longitude) See info. at: <a href="https://en.wikipedia.org/wiki/Trilobite" rel="noreferrer nofollow">en.wikipedia.org/wiki/Trilobite</a> |
Date | |
Source | Basidechenella lucasensis (fossil trilobite) (Silica Formation, Middle Devonian; quarry northwest of Paulding, Ohio, USA) 1 |
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@N05/48340432507. It was reviewed on 18 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
18 October 2019
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current | 02:40, 18 October 2019 | ![]() | 2,267 × 1,653 (3.12 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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ISO speed rating | 80 |
Date and time of data generation | 13:50, 17 July 2019 |
Lens focal length | 18.6 mm |
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File change date and time | 15:21, 21 July 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:50, 17 July 2019 |
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Scene capture type | Portrait |
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Date metadata was last modified | 11:21, 21 July 2019 |
Unique ID of original document | 0F351029DC14C52FD34CC67E6A9D6D7A |