The Late Triassic (also known as Upper Triassic, or Keuper) is the third and final of three epochs of the Triassic period. It spans the time between 228 ± 2 Ma and 199.6 ± 0.6 Ma (million years ago).
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U. inornata

Binomial name
Uma inornata
Cope, 1895

The Coachella Valley Fringe-toed Lizard, Uma inornata, is a Californian species of lizard.
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Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Chordata
Bateson, 1885

Typical Classes

See below

Chordates (phylum Chordata) are a group of animals that includes the vertebrates, together with several closely related invertebrates.
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Sauropsida*
Goodrich, 1916

Subclasses

• Anapsida
• Diapsida
  

Synonyms

• Reptilia Laurenti, 1768

Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane, and members of the class
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Diapsida
Osborn, 1903

Groups

See text

Diapsids ("two arches") are a group of tetrapod animals that developed two holes (temporal fenestra) in each side of their skulls, about 300 million years ago during the late Carboniferous period.
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Lepidosauromorpha
Benton, 1983

Orders

• Thalattosauriformes (extinct)
• Placodontia (extinct)
• Nothosauroidea (extinct)
• Plesiosauria (extinct)
• Eolacertilia (extinct)
• Sphenodontia
• Squamata
  

Lepidosauromorpha
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order (Latin: ordo, plural ordines) is a rank between class and family (termed a taxon at that rank). The superorder is a rank between class and order. Exact details of formal nomenclature depend on the Nomenclature Code which applies.
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Sphenodontia
Williston, 1925

Families

• Gephyrosauridae
• Pleurosauridae
• Sphenodontidae
  

Sphenodontia is an order of lizard-like reptiles that includes only one living genus, the tuatara (Sphenodon).
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Squamata
Oppel, 1811



Suborders
see text

This article is about the Squamata order of reptiles. For the Roman scale armour see: Lorica squamata.

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Sauropsida*
Goodrich, 1916

Subclasses

• Anapsida
• Diapsida
  

Synonyms

• Reptilia Laurenti, 1768

Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane, and members of the class
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Sphenodon
Gray, 1831



Species

Sphenodon punctatus (Gray, 1842)
Sphenodon guntheri (Buller, 1877)
Sphenodon diversum
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Lacertilia*
Günther, 1867

Families

Many, see text.

Lizards are reptiles of the order Squamata, normally possessing four legs, external ear openings and movable eyelids.
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Serpentes
Linnaeus, 1758

Infraorders and Families

• Alethinophidia - Nopcsa, 1923
• Acrochordidae- Bonaparte, 1831

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Amphisbaenia
Gray, 1844



The Amphisbaenia are a suborder of peculiar, usually legless squamates closely related to lizards and snakes, in spite of their resemblance to earthworms (many
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Sauropsida*
Goodrich, 1916

Subclasses

• Anapsida
• Diapsida
  

Synonyms

• Reptilia Laurenti, 1768

Reptiles are tetrapods and amniotes, animals whose embryos are surrounded by an amniotic membrane, and members of the class
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Squamata
Oppel, 1811



Suborders
see text

This article is about the Squamata order of reptiles. For the Roman scale armour see: Lorica squamata.

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Sphenodontia
Williston, 1925

Families

• Gephyrosauridae
• Pleurosauridae
• Sphenodontidae
  

Sphenodontia is an order of lizard-like reptiles that includes only one living genus, the tuatara (Sphenodon).
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Sphenodon
Gray, 1831



Species

Sphenodon punctatus (Gray, 1842)
Sphenodon guntheri (Buller, 1877)
Sphenodon diversum
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Sauropterygia
Owen, 1860

Orders

• ?Thalattosauriformes
• Placodontia
• Nothosauroidea
• Plesiosauria
  

Sauropterygia ("lizard flippers") is a group of very successful aquatic reptiles that flourished during the Age of the Dinosaurs
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Nothosauria
Baur, 1889

Suborders

• Suborder Pachypleurosauria
• Pachypleurosauridae
• '''Suborder Nothosauria
• Simosauridae

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Plesiosauria
de Blainville, 1835

Suborders

Plesiosauroidea
Pliosauroidea
Plesiosauria (IPA /ˈplisiəˌsɔɹ/) (Greek: plesios meaning 'near to' and
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