File:Arthroacantha carpenteri (fossil crinoid) (Silica Shale, Middle Devonian; Sylvania, Ohio, USA) 1 (35790284185).jpg
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| Description |
Arthroacantha carpenteri (Hinde, 1885) - fossil crinoid in shale from the Devonian of Ohio, USA. (public display, Cleveland Museum of Natural History, Cleveland, Ohio, USA) Crinoids (sea lilies) are sessile, benthic, filter-feeding, stalked echinoderms that are relatively common in the marine fossil record. Crinoids are also a living group, but are uncommon in modern oceans. A crinoid is essentially a starfish-on-a-stick. The stick, or stem, is composed of numerous stacked columnals, like small poker chips. Stems and individual columnals are the most commonly encountered crinoid fossils in the field. Intact, fossilized crinoid heads (crowns, calices, cups) are unusual. Why? Upon death, the crinoid body starts disintegrating very rapidly. The soft tissues holding the skeletal pieces together decay and the skeleton falls apart. Classification: Animalia, Echinodermata, Crinoidea, Camerata, Monobathrida, Hexacrinitidae Stratigraphy: Silica Shale (Silica Formation), Middle Devonian Locality: unrecorded/undisclosed site at or near the town of Sylvania (very likely from a quarry), northwestern Lucas County, northwestern Ohio, USA |
| Date | |
| Source | Arthroacantha carpenteri (fossil crinoid) (Silica Shale, Middle Devonian; Sylvania, 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@N05/35790284185 (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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:04, 7 December 2019 | | 2,020 × 1,963 (2.61 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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