File:Fletcheria guelphensis (fossil coral) (Silurian; Ottawa County, Ohio, USA) 2.jpg

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English: Fletcheria guelphensis (Whiteaves, 1884) - fossil colonial coral in dolostone from the Silurian of Ohio, USA.

Rugose corals, or "horn corals", are an extinct group - they only occur in Paleozoic rocks. Some rugosans were colonial, but most were solitary, with a calcitic skeleton that tapered to a point. The pointed end was in the seafloor sediments. A sea anemone-type organism (polyp) originally occupied the cup's living space at top. Coral polyps have numerous tentacles with stinging cells (nematocysts) that paralyze prey. Many corals have photosynthesizing microbes (zooxanthellae) living symbiotically within their tissues.

Classification: Animalia, Cnidaria, Anthozoa, Rugosa, Pycnostylidae

Stratigraphy: unrecorded Silurian-aged unit

Locality: quarry in Ottawa County, northwestern Ohio (likely the Clay Center Quarry, but possibly from the Genoa quarry)

See info. at:

en.wikipedia.org/wiki/Rugosa
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Source https://www.flickr.com/photos/47445767@N05/52049035523/
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@N05/52049035523. It was reviewed on 4 May 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

4 May 2022

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current14:59, 4 May 2022Thumbnail for version as of 14:59, 4 May 20223,196 × 2,138 (3.91 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52049035523/ with UploadWizard

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