A new specimen of the basal macronarian Camarasaurus (Dinosauria: Sauropoda) highlights variability and cranial allometry within the genus

• Autorzy: Woodruff D. Cary , Wilhite D. Ray , Larson Peter L. , Eads Matthew

Identyfikatory

DOI

10.7306/VJ.19.5

• Języki publikacji: EN

Abstrakty

EN

Camarasaurus represents one of the most common dinosaurs from North America, and certainly a contender for one of the most abundantly represented dinosaur taxa worldwide. With numerous specimens ranging the gamut of completeness and maturity, Camarasaurus would theoretically represent a neosauropodian exemplar towards better understanding intra- and interspecific variation, dimorphism, and life history development and strategies. And yet, counterintuitively, its abundance is seemingly a deterrent for active research. Herein we describe a new specimen of Camarasaurus sp. which is most notably known from a nearly complete and articulated skull. While Camarasaurus cranial material is unquestionably the most common sauropod cranial material from North America, our understanding of the total cranial morphology is limited, and largely relies on more limited and historic specimens. In addition to further illuminating the morphology and variation present in Camarasaurus crania, associated post-crania also allow for the first recognition of possible cranial allometry. The identification of this perplexing cranial allometry in several specimens indicates that it is not a singular variation. Though this analysis was not able to source the causal mechanism, factors such as taxonomy, dimorphism, or extreme intra-/intraspecific variation are all possible considerations for future analyses. The recognition of this undocumented cranial allometry further emphasizes that despite being so numerous, there is still vast gaps in our knowledge about Camarasaurus; and this analysis further echoes that the genus is in desperate need of revision.

Słowa kluczowe

EN

Camarasaurus; cranial allometry; Morrison Formation

PL

Camarasaurus; allometria czaszki; formacja Morrisona

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Volumina Jurassica
• Rocznik: 2021
• Tom: Vol. 19, no. 1
• Strony: 109--130
• Opis fizyczny: Bibliogr. 44 poz.

Twórcy

autor

Woodruff D. Cary

• Royal Ontario Museum, University of Toronto, 100 Queens Park, Toronto, ON M5S 2C6, Canada
• Great Plains Dinosaur Museum, 405 North 1st St East, PO Box 170 Malta, 59538 Montana, U.S.A.

autor

Wilhite D. Ray

• College of Veterinary Medicine, Auburn University, Auburn, Alabama 36849, U.S.A.

autor

Larson Peter L.

• Black Hills Institute of Geological Research, Inc., 117 Main Street, Hill City, South Dakota 57745, U.S.A.

autor

Eads Matthew

• Department of Geosciences, Fort Hays State University, 600 Park Street, Tomanek Hall 233, Kansas 67601, U.S.A.

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