Labrujasuchus, new shuvosaurid from Late Triassic of New Mexico (free pdf)
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Ben Creisler
May 26, 2026, 11:42:14 AM (11 days ago) May 26
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Ben Creisler
A new paper:
Alan H. Turner, Ciara E. Kernan, Adam Laing, Adam C. Pritchard, Michelle R. Stocker, Randall B. Irmis, Nathan D. Smith, Sarah Werning & Sterling J. Nesbitt (2026)
A new shuvosaurid (Archosauria, Poposauroidea) from the Late Triassic (Norian) Hayden Quarry of New Mexico, U.S.A.
Journal of Vertebrate Paleontology e2618182
doi: https://doi.org/10.1080/02724634.2026.2618182
https://www.tandfonline.com/doi/full/10.1080/02724634.2026.2618182
Free pdf:
https://www.tandfonline.com/doi/epdf/10.1080/02724634.2026.2618182
Bipedal shuvosaurid archosaurs were present for much of the Late Triassic Period. The clade is particularly diverse in Upper Triassic assemblages in the western U.S.A. Isolated bones are easily differentiated from contemporary archosaurs, but the two named North American species, Shuvosaurus inexpectatus and Effigia okeeffeae, display remarkably similar skeletons. Here we describe a new shuvosaurid species, Labrujasuchus expectatus, gen. et sp. nov., from the middle Norian (∼212 Ma) Hayden Quarry of northern New Mexico, U.S.A., located within the Petrified Forest Member of the Chinle Formation, that fills the temporal gap between the two species. The holotype consists of a partial skeleton, with additional shuvosaurid material from the Hayden Quarry likely pertaining to this taxon. This taxon is distinguished by four autapomorphies and assignable to Shuvosauridae based on a deep fossa present on the posterodorsal edge of the coracoid, the proximal portion of the humerus less than twice the width of the midshaft, the anteromedial tuber of the femur large and ‘hooked’ posteriorly, and a ventrally descended posterolateral portion of the femoral head. Recent Bayesian estimates of archosaur phylogeny and divergence times suggested a Middle Triassic split for Shuvosauridae as well as a decrease in the rate of morphological evolution for the clade relative to that of other archosaurs. The anatomical similarity of L. expectatus with other shuvosaurids is consistent with these estimated low rates, and the long gaps in the fossil record for the clade suggest that much of their evolutionary history remains to be sampled.
http://zoobank.org/urn:lsid:zoobank.org:pub:E2636A39-A394-4FAB-B1A9-CBED014A4E7B
Free pdf:
Labrujasuchus expectatus gen. et sp. nov.
Labrujasuchus expectatus gen. et sp. nov.
Alan H. Turner, Ciara E. Kernan, Adam Laing, Adam C. Pritchard, Michelle R. Stocker, Randall B. Irmis, Nathan D. Smith, Sarah Werning & Sterling J. Nesbitt (2026)
A new shuvosaurid (Archosauria, Poposauroidea) from the Late Triassic (Norian) Hayden Quarry of New Mexico, U.S.A.
Journal of Vertebrate Paleontology e2618182
doi: https://doi.org/10.1080/02724634.2026.2618182
https://www.tandfonline.com/doi/full/10.1080/02724634.2026.2618182
Free pdf:
https://www.tandfonline.com/doi/epdf/10.1080/02724634.2026.2618182
Bipedal shuvosaurid archosaurs were present for much of the Late Triassic Period. The clade is particularly diverse in Upper Triassic assemblages in the western U.S.A. Isolated bones are easily differentiated from contemporary archosaurs, but the two named North American species, Shuvosaurus inexpectatus and Effigia okeeffeae, display remarkably similar skeletons. Here we describe a new shuvosaurid species, Labrujasuchus expectatus, gen. et sp. nov., from the middle Norian (∼212 Ma) Hayden Quarry of northern New Mexico, U.S.A., located within the Petrified Forest Member of the Chinle Formation, that fills the temporal gap between the two species. The holotype consists of a partial skeleton, with additional shuvosaurid material from the Hayden Quarry likely pertaining to this taxon. This taxon is distinguished by four autapomorphies and assignable to Shuvosauridae based on a deep fossa present on the posterodorsal edge of the coracoid, the proximal portion of the humerus less than twice the width of the midshaft, the anteromedial tuber of the femur large and ‘hooked’ posteriorly, and a ventrally descended posterolateral portion of the femoral head. Recent Bayesian estimates of archosaur phylogeny and divergence times suggested a Middle Triassic split for Shuvosauridae as well as a decrease in the rate of morphological evolution for the clade relative to that of other archosaurs. The anatomical similarity of L. expectatus with other shuvosaurids is consistent with these estimated low rates, and the long gaps in the fossil record for the clade suggest that much of their evolutionary history remains to be sampled.
http://zoobank.org/urn:lsid:zoobank.org:pub:E2636A39-A394-4FAB-B1A9-CBED014A4E7B
Mickey Mortimer
May 27, 2026, 5:53:54 AM (10 days ago) May 27
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For my anyway, the pdf is only free to view and not to download, but that usually tends to change in a week or so after publication.
Mickey Mortimer
Mickey Mortimer
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