File:Isotelus maximus fossil trilobite (Flat Run Trilobite Lagerstatte, Arnheim Formation, Upper Ordovician; Flat Run Quarry, far-southwestern Highland County, southwestern Ohio, USA) 2 (15262901845).jpg
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Summary
| Description |
Isotelus maximus Locke, 1838 trilobite (~5.2 cm long) from the Upper Ordovician of Ohio, USA. This holaspid has genal spines that are longer than the entire thorax. Stratigraphy & age: Flat Run Trilobite Lagerstätte, mid-Arnheim Formation, lower Richmondian Stage, upper Upper Ordovician. Locality: Flat Run Trilobite Quarry, far-southwestern Highland County, southwestern Ohio, USA. Collected & prepared by Dan Cooper. The “official” state fossil of Ohio is the trilobite Isotelus, which attained impressively large sizes (up to 15 inches for complete Ohio specimens). Two species of Isotelus are known in the Ohio-Indiana-Kentucky Upper Ordovician outcrop belt: Isotelus maximus Locke, 1838 and Isotelus gigas Dekay, 1824. The key differences between these two species are: Isotelus maximus - genal spines in all holaspid stages, a larger maximum holaspid size, and a semicircular cephalic & pygidial outline. Isotelus gigas - lack of genal spines in large holaspids, a smaller maximum holaspid size, and a subtriangular cephalic & pygidial outline. Classification: Arthropoda, Trilobita, Polymerida, Asaphidae |
| Date | |
| Source | Isotelus maximus fossil trilobite (Flat Run Trilobite Lagerstatte, Arnheim Formation, Upper Ordovician; Flat Run Quarry, far-southwestern Highland County, southwestern Ohio, USA) 2 |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15262901845. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:55, 6 May 2015 | | 605 × 868 (811 KB) | Natuur12 | Transferred from Flickr via Flickr2Commons |
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