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Spathorhynchus Temporal range: Middle Eocene - Early Oligocene, 40–30 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Family:	Rhineuridae
Genus:	†Spathorhynchus Berman, 1973
Species
†S. fossorium Berman, 1973 (type) †S. natronicus Berman, 1977

Spathorhynchus is an extinct genus of amphisbaenians or worm lizards that existed from the Middle Eocene to the Early Oligocene in what is now Wyoming. It includes two species, the type species S. fossorium, named in 1973 from the Middle Eocene Bridger and Wind River Formations, and the species S. natronicus, named in 1977 from the Lower Oligocene White River Formation. Spathorhynchus belongs to the family Rhineuridae, which includes many other extinct species that ranged across North America at various times in the Cenozoic but only has one surviving member, Rhineura floridana, from Florida. Spathorhynchus differs from all other rhineurids except Dyticonastis from the Late Oligocene-Early Miocene of Oregon in having a slightly widened, spatula-shaped snout tip with a low angle of about 30 degrees. The two taxa may be closely related, having evolved in isolation in western North America after the formation of the Rocky Mountains separated them from rhineurids further east.^[1]

References

^ 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

Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Lepidosauria

Iguania

Acrodonta

Anqingosaurus Barbaturex Bharatagama Gueragama Xianglong
Agamidae	Indiagama Suratagama

Pleurodonta / Iguanoidea

Anolbanolis Suzanniwana Uquiasaurus Xihaina
Corytophanidae	Aciprion? Babibasiliscus Geiseltaliellus
†Gobiguania	Anchaurosaurus Ctenomastax Igua Isodontosaurus Polrussia Saichangurvel Temujinia Zapsosaurus
Iguanidae	Afairiguana Polychrotidae Armandisaurus Lapitiguana Pariguana Pristiguana Pumilia
Phrynosomatidae	Desertiguana

Other extinct iguanians

Brasiliguana Hoyalacerta? Huehuecuetzpalli? Swainiguanoides
†Arretosauridae	Arretosaurus Dornosaurus Ergiliinsaurus Khaichinguana
†Priscagamidae	Heterodontagama Mimeosaurus Phrynosomimus Pleurodontagama? Priscagama

†Polyglyphanodontia / Borioteiioidea

Chamopsiidae	Chamops Gerontoseps Glyptogenys Harmodontosaurus Haptosphenus Leptochamops Meniscognathus Pelsochamops Socognathus Stypodontosaurus Trippenaculus
Gilmoreteiidae / "macrocephalosaurines"	Gilmoreteius Kuwajimalla Yechilacerta
"Polyglyphanodontines"	Bicuspidon Cherminsaurus Darchansaurus Distortodon Erdenetesaurus Polyglyphanodon Sineoamphisbaena?
Other polyglyphanodontians	Adamisaurus Funiusaurus Gobinatus Obamadon Olindalacerta? Paleochelco? Peneteius Tchingisaurus Tianyusaurus Tijubina? Tripennaculus

Stem Scincogekkonomorpha

Scincogekkonomorpha

Scleroglossa

Gekkonomorpha

Norellius
Gekkota	Cadurcogekko Cretaceogekko Gobekko Hoburogekko Yanatarogecko

Stem Autarchoglossa
(Evansauria)

Parmeosaurus Tepexisaurus Tijubina?
†Bainguidae?	Bainguis? Eoxanta Globaura Myrmecodaptria

Oligodontosaurus Todrasaurus
Amphisbaenidae	Listromycter Lophocranion
Bipedidae	Anniealexandria
Blanidae	Blanosaurus Cuvieribaena Louisamphisbaena
†Chthonophidae	Chthonophis
Rhineuridae	Archaerhineura Dyticonastis Hadrorhineura Hyporhina Jepsibaena Macrorhineura Ototriton Plesiorhineura Protorhineura Spathorhynchus
†Polyodontobaenidae	Polyodontobaena

Barbatteius
Oardasaurus

Xantusiidae

Scincoidea

Retinosaurus Scincoideus Slavoia
Scincidae	Axonoscincus Orthoscincus Pyrenasaurus?

Other scincomorphs

Apsgnathus Calanguban Chromatogenys Dakotaseps Kleskunsaurus Lonchisaurus Monocnemodon Pachygenys Saurillodon Saurillus Sciroseps Webbsaurus
†Paramacellodidae	Atokasaurus? Becklesius Mimobecklesisaurus Paramacellodus Parasaurillus? Pseudosaurillus? Sharovisaurus

Anguimorpha

Basal anguimorphs

†Mosasauroidea?

†Aigialosauridae
†Mosasauridae

Neoanguimorpha

Carusioidea

Carusia
Xenosauridae	Entomophontes Exostinus Restes

Anguidae

Odaxosaurus
Anguinae	Headonhillia Helvetisaurus Ophisauriscus Ragesaurus
Diploglossinae	Apodosauriscus Eodiploglossus
Gerrhonotinae	Paragerrhonotus Parophisaurus
†Glyptosaurinae	Arpadosaurus Melanosaurus Gaultia Glyptosaurus Helodermoides Odaxosaurus Paraglyptosaurus Paraplacosauriops Peltosaurus Placosaurus Proglyptosaurus Proxestops Xestops

Paleoanguimorpha

Basal varanoids / platynotans

Shinisauria?

Goannasauria

Basal Goannasaurians

Varanoidea

Lanthanotidae	Cherminotus
Varanidae	Ovoo Saniwa Archaeovaranus
Other platynotans / varanoids	Arcanosaurus? Cemeterius Dryadissector

Ophidia
Coniophis Diablophis Dinilysia? Eophis Lapparentophis Najash? Parviraptor Portugalophis Tetrapodophis See Serpentes (snakes)

Indeterminate squamates
Costasaurus Lamiasaura Oculudentavis? Schillerosaurus

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