File:Mioplosus labracoides fossil fish with partially digested fish in its stomach (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, USA) 1 (15335370768).jpg

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Mioplosus labracoides Cope, 1877 fossil fish in lacustrine marlstone from the Eocene of Wyoming, USA (16.7 cm across).

The Green River Formation of Utah-Colorado-Wyoming is famous for having vast oil shale deposits and for having exquisitely-preserved fossils. Fossil Butte National Monument in southwestern Wyoming preserves and displays some of these high-quality fossils. Leaves and fish are the most common large fossils in the Fossil Lake Basin of the Green River Fm.

Mioplosus is a fossil perch. It was a predator, mainly feeding on the common, smaller fish Knightia. The Mioplosus shown here has a partially digested Knightia visible in its stomach - most of the Knightia’s vertebral column and the proximal ribs are still present. The brownish area just below the Mioplosus backbone may be a remnant of the Knightia’s head, but I’m not sure.

Classification: Animalia, Chordata, Vertebrata, Actinopterygii, Perciformes, Percidae

Stratigraphy: Eighteen Inch Layer, Fossil Butte Member, Green River Formation, upper Wasatchian Stage (Wa4)/Ypresian Stage/Lostcabinian, Lower Eocene

Locality: Fossil Lake Basin, southwestern Wyoming, USA
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Source Mioplosus labracoides fossil fish with partially digested fish in its stomach (Green River Formation, Lower Eocene; Fossil Lake Basin, southwestern Wyoming, 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@N05/15335370768 (archive). It was reviewed on 15 January 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 January 2019

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current09:15, 15 January 2019Thumbnail for version as of 09:15, 15 January 20192,999 × 1,199 (557 KB)Animalparty (talk | contribs)Transferred from Flickr via #flickr2commons

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