Suchia

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Suchians
Temporal range: Early Triassic - Recent, 249.7–0 Ma
Prestosuchus.jpg
Prestosuchus chiniquensis, an early suchian
Scientific classification edit
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Pseudosuchia
Clade: Suchia
Krebs, 1974
Subgroups

Suchia is a clade of archosaurs containing the majority of pseudosuchians. It includes crocodilians and their extinct relatives. It was defined as the least inclusive clade containing Aetosaurus ferratus, Rauisuchus tiradentes, Prestosuchus chiniquensis, Gracilisuchus stipanicicorum, and Crocodylus niloticus (the living Nile crocodile) by Nesbitt (2011). Generally the only pseudosuchians which are excluded from the group are the ornithosuchids, although at least one analysis classifies ornithosuchids as close relatives of erpetosuchids (which are usually considered suchians) and aetosaurs (which are suchians by definition of the group).[1]

Classification[edit]

It was originally defined by Krebs in 1974. Paul Sereno provided a different definition, which included Gracilisuchus stipanicicorum, Aetosauria, Rauisuchia, Poposauridae, Crocodylomorpha, and all descendants of their common ancestor. Nesbitt (2011) redefined it as the least inclusive clade containing Aetosaurus ferratus, Rauisuchus tiradentes, Prestosuchus chiniquensis, and Crocodylus niloticus (the living Nile crocodile). Suchia, therefore, is a node-based taxon. It includes crocodylomorphs and more basal Triassic forms like aetosaurs and rauisuchians.[2] Butler et al. (2011) found that Suchia includes Gracilisuchus, Turfanosuchus, Revueltosaurus, Aetosauria, Ticinosuchus, and paracrocodylomorphs.[3]

Phylogeny[edit]

Below is the cladogram originally identified by Krebs (1974) in his definition of Suchia:[2]

Suchia

Aetosaurus ferratus

Paracrocodylomorpha
Poposauroidea

Poposaurus gracilis

Shuvosauridae

Sillosuchus longicervix

Shuvosaurus inexpectatus

Loricata
Rauisuchidae

Rauisuchus tiradentes

Crocodylomorpha

Crocodylus niloticus

Below is a phylogenetic cladogram by Butler et al. in 2011 showing the cladistics of Archosauriformes, focusing mostly on Pseudosuchia:[3] Clade names follow Nesbitt 2011.[2]

Archosauromorpha

Mesosuchus

Prolacerta

Archosauriformes

Proterosuchus

Erythrosuchus

Vancleavea

Proterochampsia

Tropidosuchus

Chanaresuchus

Euparkeria

Phytosauria

Parasuchus

Smilosuchus

Pseudopalatus

Archosauria
Pseudosuchia
Ornithosuchidae

Riojasuchus

Ornithosuchus

Suchia

Gracilisuchus

Turfanosuchus

Revueltosaurus

Aetosauria

Aetosaurus

Stagonolepis

Longosuchus

Ticinosuchus

Paracrocodylomorpha
Poposauroidea

Qianosuchus

Ctenosauriscidae

Arizonasaurus

Xilousuchus

Hypselorhachis

Ctenosauriscus

Waldhaus Taxon

Poposaurus gracilis H

Poposaurus gracilis Y

Lotosaurus

Shuvosauridae

Sillosuchus

Shuvosaurus

Effigia

Loricata

Prestosuchus

Saurosuchus

Batrachotomus

Fasolasuchus

Rauisuchidae

Rauisuchus

Polonosuchus silesiacus

Postosuchus alisonae

Postosuchus kirkpatricki

Crocodylomorpha

CM 73372

Hesperosuchus agilis

Hesperosuchus "agilis"

Dromicosuchus

Alligator

Avemetatarsalia

References[edit]

  1. ^ Ezcurra, Martín D.; Fiorelli, Lucas E.; Martinelli, Agustín G.; Rocher, Sebastián; Baczko, M. Belén von; Ezpeleta, Miguel; Taborda, Jeremías R. A.; Hechenleitner, E. Martín; Trotteyn, M. Jimena (11 September 2017). "Deep faunistic turnovers preceded the rise of dinosaurs in southwestern Pangaea". Nature Ecology & Evolution. 1 (10): 1477–1483. doi:10.1038/s41559-017-0305-5. ISSN 2397-334X.
  2. ^ a b c Nesbitt, S.J. (2011). "The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades". Bulletin of the American Museum of Natural History. 352: 189. doi:10.1206/352.1. ISSN 0003-0090.
  3. ^ a b Butler, R.J.; Brusatte, S.J.; Reich, M.; Nesbitt, S.J.; Schoch, R.R.; Hornung, J.J. (2011). Andrew A. Farke, ed. "The Sail-Backed Reptile Ctenosauriscus from the Latest Early Triassic of Germany and the Timing and Biogeography of the Early Archosaur Radiation". PLoS ONE. 6 (10): e25693. doi:10.1371/journal.pone.0025693. PMC 3194824. PMID 22022431.

External links[edit]