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A new species of the durophagous mosasaur Globidens (Squamata, Mosasauridae) from the Late Cretaceous Pierre Shale Group of central South Dakota, USA

James E. Martin
A new species of the durophagous mosasaur Globidens (Squamata, Mosasauridae) from the Late Cretaceous Pierre Shale Group of central South Dakota, USA (in The geology and paleontology of the Late Cretaceous marine deposits of the Dakotas, James E. Martin (editor) and David C. Parris (editor))
Special Paper - Geological Society of America (2007) 427: 177-198

Abstract

The most complete specimen of the unusual mosasaur Globidens has been discovered in central South Dakota along the Missouri River. The specimen consists of the anterior half of a skeleton, including crushed skull, pectoral girdle, partial paddle, and vertebral series. One humerus and ulna exhibit pathologies. The partial skeleton was found at the top of the DeGrey Formation (upper Campanian) of the Pierre Shale Group and is therefore the youngest skeleton from North America. The specimen exhibits apomorphies that correspond with the late occurrence and indicate a new species. Increased dental hypsodonty, lack of a posterior buttress on teeth, great size, and massive build indicate a derived intermediate species of a clade that first occurred with rounded teeth in the early Campanian in North America and Europe (Globidens alabamaensis and Globidens dakotensis) and culminated with high-crowned teeth with posterior buttresses in the Maastrichtian of Africa, the Middle East, and South America (Globidens phosphaticus). Associated with the specimen are bivalves that are interpreted as stomach contents and shark teeth that are interpreted as the result of scavenging.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 427
Title: A new species of the durophagous mosasaur Globidens (Squamata, Mosasauridae) from the Late Cretaceous Pierre Shale Group of central South Dakota, USA
Title: The geology and paleontology of the Late Cretaceous marine deposits of the Dakotas
Author(s): Martin, James E.
Author(s): Martin, James E.editor
Author(s): Parris, David C.editor
Affiliation: South Dakota School of Mines and Technology, Museum of Geology, Rapid City, SD, United States
Affiliation: South Dakota School of Mines and Technology, Department of Geology and Geological Engineering, Museum of Geology, Rapid City, SD, United States
Pages: 177-198
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2427-0
References: 35
Accession Number: 2008-084272
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, 6 plates
N43°55'00" - N44°10'00", W99°34'60" - W98°55'00"
Secondary Affiliation: New Jersey State Museum, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200825
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