Typothoracinae is a clade of aetosaurs within the subfamilyAetosaurinae. 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]
Referencesedit
^ 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. PMC4727975.
^ 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, clade, aetosaurs, within, subfamily, aetosaurinae, originally, defined, stem, based, taxon, including, aetosaurs, closer, typothorax, than, stagonolepis, desmatosuchus, this, definition, later, expanded, specifically, exclude, aetosaurus, 2016,. 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 TypothoracinaeTemporal range Late Triassic Typothorax coccinarum Scientific classification Domain Eukaryota Kingdom Animalia Phylum Chordata Class Reptilia Clade Archosauria Clade Pseudosuchia Order Aetosauria Family Stagonolepididae Subfamily TypothoracinaeParker 2007 Clades and genera Apachesuchus Chilenosuchus Gorgetosuchus Kryphioparma Redondasuchus Typothorax Paratypothoracini Heliocanthus Kocurypelta Paratypothorax Tecovasuchus Venkatasuchus 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 References edit a b c d Parker 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 a b c Parker 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 nbsp Paleontology portal nbsp This article about a prehistoric archosaur is a stub You can help Wikipedia by expanding it vte nbsp This article related to a Triassic animal is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Typothoracinae amp oldid 1200963586, wikipedia, wiki, book, books, library,
