File:Protoceratops andrewsi (ceratopsian dinosaur) (Djadokhta Formation, Upper Cretaceous; Flaming Cliffs, Gobi Desert, Mongolia) 1.jpg

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English: Protoceratops andrewsi Granger & Gregory, 1923 - fossil ceratopsian dinosaur skull from the Cretaceous of Mongolia. (replica of an AMNH specimen, American Museum of Natural History, New York City, New York State, USA)

Ceratopsians are the "horned dinosaurs". They were large, quadrupedal, herbivorous dinosaurs having a beaked skull and a frill - an extension of bone behind the skull that partially covered the neck. Ceratopsian dinosaurs are known from the Jurassic and Cretaceous. The last members of the group died out at the Cretaceous-Tertiary boundary, 65 million years ago.

Seen here is a Protoceratops andrewsi skull from the Cretaceous of Mongolia's Gobi Desert - this type of certaopsian lacked facial horns. The openings in the frill are called fenestra - their presence reduced the weight of the skull.

Classification: Animalia, Chordata, Vertebrata, Reptilia, Archosauria, Dinosauria, Ornithischia, Marginocephalia, Ceratopsia, Protoceratopsidae

Stratigraphy: Djadokhta Formation, Campanian Stage, upper Upper Cretaceous

Locality: Flaming Cliffs, Gobi Desert, southern Mongolia

Info. at:

en.wikipedia.org/wiki/Protoceratops
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Source https://www.flickr.com/photos/47445767@N05/52879273698/
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@N05/52879273698. It was reviewed on 9 May 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

9 May 2023

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