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Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA.

Abstract

Like many long-standing dinosaur taxa, Brachiosaurus altithorax from the Upper Jurassic Morrison Formation of North America suffers from taxonomic issues stemming from a relatively incomplete holotype. Lack of anatomical overlap has precluded definitive referral of important specimens, including a mostly complete skull discovered in 1883. We redescribe this skull and some other significant brachiosaurid specimens based on new preparation and computed tomographic (CT) data. We argue that these elements are most parsimoniously referred to B. altithorax. Including these tentatively referred elements in a phylogenetic analysis does not alter the hypothesized relationships of B. altithorax, congruent with the presence of a single brachiosaurid taxon across western North America in the Late Jurassic. Based on CT data, we estimate that B. altithorax had a slower tooth replacement rate than Camarasaurus or the diplodocoids it shared Morrison Formation landscapes with, which suggests a difference in diet and/or feeding strategy. Anat Rec, 2019. © 2019 Wiley Periodicals, Inc.

Authors+Show Affiliations

Department of Biology, Adelphi University, Garden City, New York. Anatomical Sciences Department, Health Sciences Center, Stony Brook University, Stony Brook, New York.Curator of Dinosauria, Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, District of Columbia.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31254331

Citation

D'Emic, Michael D., and Matthew T. Carrano. "Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA." Anatomical Record (Hoboken, N.J. : 2007), 2019.
D'Emic MD, Carrano MT. Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA. Anat Rec (Hoboken). 2019.
D'Emic, M. D., & Carrano, M. T. (2019). Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA. Anatomical Record (Hoboken, N.J. : 2007), doi:10.1002/ar.24198.
D'Emic MD, Carrano MT. Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA. Anat Rec (Hoboken). 2019 Jun 28; PubMed PMID: 31254331.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA. AU - D'Emic,Michael D, AU - Carrano,Matthew T, Y1 - 2019/06/28/ PY - 2018/06/02/received PY - 2018/11/16/revised PY - 2019/02/28/accepted PY - 2019/6/30/pubmed PY - 2019/6/30/medline PY - 2019/6/30/entrez KW - Brachiosaurus KW - Morrison KW - dinosaur KW - sauropod JF - Anatomical record (Hoboken, N.J. : 2007) JO - Anat Rec (Hoboken) N2 - Like many long-standing dinosaur taxa, Brachiosaurus altithorax from the Upper Jurassic Morrison Formation of North America suffers from taxonomic issues stemming from a relatively incomplete holotype. Lack of anatomical overlap has precluded definitive referral of important specimens, including a mostly complete skull discovered in 1883. We redescribe this skull and some other significant brachiosaurid specimens based on new preparation and computed tomographic (CT) data. We argue that these elements are most parsimoniously referred to B. altithorax. Including these tentatively referred elements in a phylogenetic analysis does not alter the hypothesized relationships of B. altithorax, congruent with the presence of a single brachiosaurid taxon across western North America in the Late Jurassic. Based on CT data, we estimate that B. altithorax had a slower tooth replacement rate than Camarasaurus or the diplodocoids it shared Morrison Formation landscapes with, which suggests a difference in diet and/or feeding strategy. Anat Rec, 2019. © 2019 Wiley Periodicals, Inc. SN - 1932-8494 UR - https://www.unboundmedicine.com/medline/citation/31254331/Redescription_of_Brachiosaurid_Sauropod_Dinosaur_Material_From_the_Upper_Jurassic_Morrison_Formation,_Colorado,_USA L2 - https://doi.org/10.1002/ar.24198 DB - PRIME DP - Unbound Medicine ER -