Typothoracinae is a clade of aetosaurs within the subfamily Aetosaurinae. It was originally defined as a stem-based taxon including all aetosaurs closer to Typothorax than to Stagonolepis or Desmatosuchus. This definition was later expanded to specifically exclude Aetosaurus; as of 2016, Typothoracinae is defined as the least inclusive clade containing Typothorax and Paratypothorax, but not Aetosaurus,Stagonolepis, or Desmatosuchus.[1] The clade was first named in 2007 under the spelling Typothoracisinae, after its namesake Typothorax.[2] However, this spelling was based on incorrect taxonomic nomenclature, and the clade's name was corrected to Typothoracinae in 2016.[1]
Typothoracines can be distinguished by their wide bodies. The transverse processes of the dorsal (trunk) vertebrae are reinforced and elongated, more than twice the width of the centrum. Their neural spines, on the other hand, are short. The overlying carapace of osteoderms has a very broad, discoidal shape, distinct from the narrower carapace seen in other aetosaurs. The widest dorsal paramedian osteoderms have a width-to-length ratio exceeding 3.5. They also tend to possess a strong keel running along their underside, as well as a sigmoid lateral edge which appears to have a "clipped" posterolateral corner.[1][2]
Though typothoracines lack the massive neck spines of certain desmatosuchines, their cervical (neck) lateral osteoderms do bear moderately large curved spines with a flattened cross section. The dorsal lateral osteoderms have a strongly bent shape: there is an acute angle of flexion between the dorsal (upper) flange and the lateral (outer and lower) flange, which meet along a low blade-like surface or short spine on the outer edge of the osteoderm. In the lateral osteoderms above the hip and the front part of the tail, the lateral flange is triangular and concave, leading up to a hooked eminence.[1][2]
^ abcdParker, William G. (2016-01-21). "Revised phylogenetic analysis of the Aetosauria (Archosauria: Pseudosuchia); assessing the effects of incongruent morphological character sets". PeerJ. 4: e1583. doi:10.7717/peerj.1583. ISSN 2167-8359. PMC 4727975.
^ abcParker, W. G. (2007). "Reassessment of the aetosaur 'Desmatosuchus' chamaensis with a reanalysis of the phylogeny of the Aetosauria (Archosauria:Pseudosuchia)" (PDF). Journal of Systematic Palaeontology. 5: 41–68. doi:10.1017/S1477201906001994. S2CID 85826683.
Typothoracinae is a clade of aetosaurs within the subfamily Aetosaurinae. It was originally defined as a stem-based taxon including all aetosaurs closer...
Phylogenetic analysis indicates that Venkatasuchus belonged to the subfamily Typothoracinae and more specifically the clade Paratypothoracini, where it is recovered...
around in soil. Typothorax belongs to a clade of aetosaurs called the Typothoracinae, within the subfamily Aetosaurinae. It is closely related to Redondasuchus...
Coahomasuchus and Stenomyti, and the widespread and successful aetosaur clade Typothoracinae. Aetosaurinae was originally named in 2000, as a subfamily solely including...
Formation, Arizona. It is the oldest known member of the subfamily Typothoracinae, and is currently only known from five isolated and incomplete dorsal...
altogether. More recent studies (see below) have favored a third group, Typothoracinae, which like Desmatosuchinae has long spikes, but differs in having more...
suggesting that Apachesuchus is a wide-bodied aetosaur within the clade Typothoracinae. The holotype and referred material of Apachesuchus were initially described...
on an earlier analysis by Schoch & Desojo (2016), placed it within Typothoracinae, closely related to Typothorax and Redondasuchus. Typothoracines and...
Paratypothoracini is a clade of aetosaurs within the group Typothoracinae. It is a node-based taxon that includes Rioarribasuchus (=Heliocanthus), Paratypothorax...
Global Information
