Suchia

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

Suchia is a clade of archosaurs that includes all pseudosuchians except ornithosuchids. 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).

Classification[edit]

It was originally defined by Krebs in 1974. Paul Sereno provided an different definition. He defined Suchia as Suchia includes 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.[1] Butler et al. (2011) found that Suchia includes Gracilisuchus, Turfanosuchus, Revueltosaurus, Aetosauria, Ticinosuchus, and paracrocodylomorphs.[2]

Phylogeny[edit]

Below is the cladogram originally identified by Krebs (1974) in his definition of Suchia:[1]

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:[2] Clade names follow Nesbitt 2011.[1]


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. ^ 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. 
  2. ^ a b Butler, R.J.; Brusatte, S.J.; Reich, M.; Nesbitt, S.J.; Schoch, R.R. & Hornung, J.J. (2011). "The Sail-Backed Reptile Ctenosauriscus from the Latest Early Triassic of Germany and the Timing and Biogeography of the Early Archosaur Radiation". In Andrew A. Farke. PLoS ONE 6 (10): e25693. doi:10.1371/journal.pone.0025693. 

External links[edit]