Project 3202: M. D. D'Emic, M. T. Carrano. 2020. Redescription of Brachiosaurid Sauropod Dinosaur Material From the Upper Jurassic Morrison Formation, Colorado, USA. The Anatomical Record. 303 (4):732-758.
Specimen: Brachiosaurus altithorax (USNM/USNM:5730)
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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 prepara- tion 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.


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Article DOI: 10.1002/ar.24198

Project DOI: 10.7934/P3202, http://dx.doi.org/10.7934/P3202
This project contains
  • 10 Media
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  • 2 Taxa
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    Authors' Institutions

    • National Museum of Natural History, Smithsonian Institution

    • Adelphi University



    Members

    member name taxa specimens media
    Michael D'Emic
    Project Administrator
    Last logged in 12/05/19
    235
    MorphoBank Curator
    Full membership
    Last logged in 05/12/20
    005


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    Folio views452Folio list (106 views); Braincase USNM 5730 Brachiosaurus (54 views); CT scan Maxilla USNM 5730 Brachiosaurus (52 views); Dentary USNM 5730 (132 views); Potter Creek Cervical Vertebrae (59 views); Premaxilla CT scan USNM 5730 (49 views);
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