Aetosaurinae

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Aetosaurinae
Temporal range: Late Triassic
Stagonolepis.jpg
Stagonolepis
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Aetosauria
Family: Stagonolepididae
Subfamily: Aetosaurinae
Heckert and Lucas, 2000
Clades

Aetosaurinae is one of the two subfamilies of aetosaurs, the other being Desmatosuchinae. It is a stem-based taxon defined as all aetosaurs more closely related to Aetosaurus than to the last common ancestor of Aetosaurus and Desmatosuchus.[1] The only synapomorphy that diagnoses the clade Aetosaurinae is the medial offset of the dorsal eminences of the paramedian osteoderms.[2] A phylogenetic study in 2012 found Aetosaurinae to be paraphyletic, with Aetosaurus being the basal-most stagonolepidid and aetosaurines like Calyptosuchus, Neoaetosauroides, and the newly described Aetobarbakinoides being successively more derived taxa leading up to a clade containing Desmatosuchinae and Typothoracisinae. Under this phylogeny, most traditional aetosaurines are more closely related to Desmatosuchus than they are to Aetosaurus, and the clade Aetosaurinae can only include Aetosaurus.[3]

References[edit]

  1. ^ Heckert, A. B.; and Lucas; S. G. (2000). "Taxonomy, phylogeny, biostratigraphy, biochronology, paleobiogeography, and evolution of the Late Triassic Aetosauria (Archosauria: Crurotarsi)". Zentralblatt für Geologie und Paläontologie, Teil I, Heft. 11-12: 1539–1587. 
  2. '^ Parker, W. G. (2007). "Reassessment of the aetosaur Desmatosuchus' chamaensis with a reanalysis of the phylogeny of the Aetosauria (Archosauria:Pseudosuchia)". Journal of Systematic Palaeontology. 5: 41–68. doi:10.1017/S1477201906001994. 
  3. ^ Desojo, J.B.; Ezcurra, M.D.; Kischlat, E.E. (2012). "A new aetosaur genus (Archosauria: Pseudosuchia) from the early Late Triassic of southern Brazil" (PDF). Zootaxa. 3166: 1–33. ISSN 1175-5326.