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Hyporhina

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Extinct genus of lizards

Hyporhina
Temporal range: Late EoceneMiddle Oligocene, 40–30 Ma PreꞒ O S D C P T J K Pg N
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Rhineuridae
Genus: Hyporhina
Baur, 1893
Species
  • H. antiqua Baur, 1893 (type)
  • H. galbreathi Taylor, 1951

Hyporhina is an extinct genus of amphisbaenians or worm lizards that lived from the Late Eocene to the Middle Oligocene (approximately 40 to 30 million years ago) in what is now the western United States.

Species

It currently includes two species, both from the White River Formation in eastern Wyoming and northeastern Colorado:

  • Hyporhina antiqua — the type species.
  • Hyporhina galbreathi
  • Hyporhina tertia — a third species named in 1972, and later synonymized with Hyporhina galbreathi.

Taxonomy

Paleontologist Georg Baur named the genus Hyporhina in 1893, making it one of the first prehistoric amphisbaenians to be described. Baur placed it in its own family, Hyporhinidae, because it possessed eye sockets that are enclosed at the back by postorbital bars, a feature that living amphisbaenians lack.

However, more recent studies have placed it within Rhineuridae, a family that includes the living Rhineura floridana from Florida, and many more extinct species from the western United States that were named after 1893 and have postorbital bars. Hyporhina differs from other rhineurids in having a steep angle to its snout.

See also

References

  1. Hembree, D.I. (2007). "Phylogenetic revision of Rhineuridae (Reptilia: Squamata: Amphisbaenia) from the Eocene to Miocene of North America". The University of Kansas Paleontological Contributions. 15: 1–20.
Extinct squamate genera
Iguania
Acrodonta
Agamidae
Pleurodonta / Iguanoidea
Corytophanidae
Gobiguania
Iguanidae
Phrynosomatidae
Other extinct iguanians
Arretosauridae
Priscagamidae
Armandisaurus explorator
Polyglyphanodontia / Borioteiioidea
Chamopsiidae
Gilmoreteiidae / "macrocephalosaurines"
"Polyglyphanodontines"
Other polyglyphanodontians
Stem Scincogekkonomorpha
Scincogekkonomorpha
Scleroglossa
Gekkonomorpha
Gekkota
Stem Autarchoglossa
(Evansauria)
Bainguidae?
Scincomorpha
Cordyloidea
Lacertoidea
Amphisbaenia
Amphisbaenidae
Bipedidae
Blanidae
Chthonophidae
Rhineuridae
Polyodontobaenidae
Contogeniidae
Lacertidae
Teiidae
Barbatteiidae
Xantusiidae
Scincoidea
Scincidae
Other scincomorphs
Paramacellodidae
Anguimorpha
Basal anguimorphs
Mosasauria?
Mosasauroidea
Neoanguimorpha
Carusioidea
Xenosauridae
Anguidae
Anguinae
Diploglossinae
Gerrhonotinae
Glyptosaurinae
Paleoanguimorpha
Basal varanoids / platynotans
Shinisauria?
Goannasauria
Basal Goannasaurians
Varanoidea
Lanthanotidae
Varanidae
Other platynotans / varanoids
Aigialosaurus dalmaticus

Plioplatecarpus primaevus Estesia mongoliensis Telmasaurus grangeri

Varanus priscus
Ophidia
Indeterminate squamates
Taxon identifiers
Hyporhina


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