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Temporal range: Late Triassic, 228–216.5 Ma
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Aetosauria
Family: Stagonolepididae
Subfamily: Desmatosuchinae
Genus: Acaenasuchus
Long & Murry 1995
  • A. geoffreyi Long & Murry 1995 (type)

Acaenasuchus (meaning "thorn crocodile") is an extinct member of the order Aetosauria, endemic to what would be North America during the Triassic, existing for approximately 11.5 million years.[1]

It was a heavily armored aetosaur with thorn-like spikes on its back.


Acaenasuchus was named by Long and Murry (1995). Its type is Acaenasuchus geoffreyi. It was assigned to Stagonolepididae by Irmis (2005).[2]


  1. ^ Paleobiology Database: Acaenasuchus, basic info
  2. ^ R. B. Irmis. 2005. The vertebrate fauna of the Upper Triassic Chinle Formation in northern Arizona. In S. J. Nesbitt, W. G. Parker, & R. B. Irmis (eds.), Guidebook to the Triassic Formations of the Colorado Plateau in Northern Arizona: Geology, Paleontology, and History. Mesa Southwest Museum Bulletin 9:63-88