Biology:Opisthiamimus

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Short description: Extinct genus of reptiles

Opisthiamimus
Temporal range: Tithonian
Opisthiamimus.svg
Restored skull in lateral view
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Rhynchocephalia
Infraorder: Eusphenodontia
Genus: Opisthiamimus
DeMar, Jones & Carrano, 2022
Type species
Opisthiamimus gregori
DeMar, Jones & Carrano, 2022[1]

Opisthiamimus (lit.Opisthias mimic) is an extinct genus of small-bodied eusphenodontian rhynchocephalian from the Upper Jurassic Morrison Formation of Northern Wyoming, United States. The type species, O. gregori, is known from four specimens, which together preserve a nearly complete skeleton. It is amongst the smallest known rhynchocephalians, with a skull length of 2.05 centimetres (0.81 in) and a snout–vent length (the length from the tip of the snout to the cloaca) of around 8.5 centimetres (3.3 in). The genus was described in 2022 by David DeMar, Marc E. H. Jones, and Matthew Carrano. It was found that it was only distantly related to Eilenodon, Theretairus and Opisthias, the other known rhynchocephalians from the Morrison Formation.[1]

Phylogeny

After describing paper:[1]

Rhynchocephalia

Gephyrosaurus bridensis

Sphenodontia

Diphydontosaurus avonis

Acrosphenodontia

Planocephalosaurus robinsonae

Rebbanasaurus jaini

Godavarisaurus lateefi

Theretairus antiquus

Eusphenodontia

Polysphenodon mulleri

Opisthiamimus gregori

Clevosauridae

Clevosaurus convallis

Clevosaurus brasiliensis

Clevosaurus hadroprodon

Clevosaurus bairdi

Clevosaurus hudsoni

Clevosaurus cambrica

Neosphenodontia

Brachyrhinodon taylori

Colobops noviportensis

Sphenodontidae

Sphenodon punctatus (tuatara)

Cynosphenodon huizachalensis

Sphenovipera jimmysjoyi

Kawasphenodon expectatus

Kawasphenodon peligrensis

Pelecymala robustus

Eilenodontinae

Fraserosphenodon latidens

Opisthias rarus

Eilenodon robustus

Sphenotitan leyesi

Toxolophosaurus cloudi

Priosphenodon avelasi

Leptorhynchia

Homoeosaurus maximiliani

Kallimodon pulchellus

Sigmala sigmala

Vadasaurus herzogi

Pleurosauridae

Palaeopleurosaurus posidonae

Pleurosaurus goldfussi

Pleurosaurus ginsburgi

Kallimodon cerinensis

Sapheosauridae

Sapheosaurus thiollierei

Ankylosphenodon pachyostosus

Oenosaurus muehlheimensis

References

  1. 1.0 1.1 1.2 DeMar, D. G.; Jones, M. E. H.; Carrano, M. T. (2022). "A nearly complete skeleton of a new eusphenodontian from the Upper Jurassic Morrison Formation, Wyoming, USA, provides insight into the evolution and diversity of Rhynchocephalia (Reptilia: Lepidosauria)". Journal of Systematic Palaeontology 20 (1): 779–786. doi:10.1080/14772019.2022.2093139. PMID 2093139. 

Wikidata ☰ Q114352163 entry