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A new Triassic archosaur paper is available online:


Adam D. Marsh, Matthew E. Smith, William G. Parker, Randall B. Irmis & Ben T. Kligman (2020) Skeletal anatomy of Acaenasuchus geoffreyi Long and Murry, 1995 (Archosauria: Pseudosuchia) and its Implications for the Origin of the Aetosaurian Carapace. Journal of Vertebrate Paleontology DOI: 10.1080/02724634.2020.1794885


If anyone is new to Triassic paleontology or early archosaurs, Acaenasuchus was named by Long & Murry (1995) on the basis of material collected from the Blue Mesa Member of the Chinle Formation of the St. Johns locality in Arizona. However, Heckert and Lucas (1999, 2000, 2002) considered Acaenasuchus to be merely a juvenile of the aetosaur Desmatosuchus, but later authors (e.g. Irmis 2005, Parker 2005) rejected this argument because several morphological differences exist between the two genera regardless of the ontogenetic status of the material of Acaenasuchus. Parker (2016) had hinted at Acaenasuchus being non-aetosaurian, and the new paper by Marsh et al. recovering Acaenasuchus as sister to Euscolosuchus and Revueltosaurus in a clade with Erpetosuchidae and Aetosauria helps to shed light on what the earliest aetosaur relatives looked like, especially with respect to development of body armor.

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