Archosaurus

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Archosaurus
Temporal range:
Ma
↓
Restored skull
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Archosauromorpha
Clade: Archosauriformes
Family: †Proterosuchidae
Subfamily: †
Chasmatosuchinae
Genus: †Archosaurus
Tatarinov, 1960
Species:
†A. rossicus
Binomial name
†Archosaurus rossicus
Tatarinov, 1960

Archosaurus (meaning "ruling lizard") is an extinct

latest Permian of Russia and Poland, it is one of the earliest known archosauriforms. The type and only species is Archosaurus rossicus, known from several fragmentary specimens which cumulatively represent parts of the skull and cervical vertebrae.[2][3] It would have been 3 metres (9.8 ft) long when fully grown.[4]

When first described in 1960, Archosaurus was considered the oldest known archosaur and a close relative of Proterosuchus from the Early Triassic.[2][4] However, Archosauria in modern terms is considered a more restricted group which Archosaurus lies outside of. The "classic" definition of archosaur utilized prior to the widespread use of cladistics is now roughly equivalent to the clade Archosauriformes.[5] Archosaurus is still considered the oldest undisputed archosauriform, as well as one of the few valid members of the family Proterosuchidae.[6]

A 2023 study placed Archosaurus in the new subfamily Chasmatosuchinae within the proterosuchids. This would make Archosaurus significantly derived despite being the oldest known archosauriform, indicating that significant diversification already occurred among proterosuchids during the Permian.[7]

Gallery

  • PIN 1100/55, the holotype left premaxilla
    PIN 1100/55, the holotype left premaxilla
  • Restoration
    Restoration
  • Size comparison
    Size comparison

See also

References

  1. S2CID 129507095
    .
  2. ^ a b Paleont. Zh. 1960 (4)
  3. ISBN 978-0-521-54582-2
    .
  4. ^ a b Tatarinov, L. P. (1960). Otkrytie pseudozhukhii v verkhnei permi SSSR: Paleontologischeskii Zhurnal, 1960, n. 4, p. 74-80.
  5. ^ Gauthier J. A. (1994): The diversification of the amniotes. In: D. R. Prothero and R. M. Schoch (ed.) Major Features of Vertebrate Evolution: 129-159. Knoxville, Tennessee: The Paleontological Society.
  6. PMID 27162705
    .
  7. PMID 37885992
    .
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