| Saurians Fossil range: Permian - Recent |
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Sauria is a clade of reptiles that includes all living diapsids, as well as their common ancestor and all its extinct descendants. The Permian is a geologic period and system that extends from 299 The tuatara is a reptile endemic to New Zealand which though it resembles most lizards is actually part of a distinct lineage order Sphenodontia. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates Reptiles, or members of the class Reptilia are air-breathing Cold-blooded Vertebrates that have skin covered in scales as opposed to hair or feathers Reptiles, or members of the class Reptilia are air-breathing Cold-blooded Vertebrates that have skin covered in scales as opposed to hair or feathers Diapsids ("two arches" are a group of Reptiles that developed two holes ( Temporal fenestra) in each side of their Skulls about 300 Million Jacques Armand Gauthier is a vertebrate paleontologist, comparative morphologist, and systematist and one of the founders of the use of Cladistics in biology Year 1984 ( MCMLXXXIV) was a Leap year starting on Sunday (link displays the 1984 Gregorian calendar) Lepidosauromorpha is a group of Reptiles comprising all Diapsids closer to Lizards than to Archosaurs (including Crocodiles and Archosauromorpha ( Greek for "ruling lizard forms" is an Infraclass of Diapsid Reptiles that first appeared during the late Permian A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor Diapsids ("two arches" are a group of Reptiles that developed two holes ( Temporal fenestra) in each side of their Skulls about 300 Million A group of organisms is said to have common descent if they have a common Ancestor. The ancestral saurian was probably a small lizard-like creature living in the Permian Period. The Permian is a geologic period and system that extends from 299 This crown group is diagnosed by a number of details in skull and skeleton, and comprises the two important clades Lepidosauromorpha and Archosauromorpha. The Crown Group is a Catering and event caterer in the United Kingdom. Lepidosauromorpha is a group of Reptiles comprising all Diapsids closer to Lizards than to Archosaurs (including Crocodiles and Archosauromorpha ( Greek for "ruling lizard forms" is an Infraclass of Diapsid Reptiles that first appeared during the late Permian
The term "Sauria" has previously been used as a synonym of Lacertilia, a suborder of Squamata that includes all lizards but excludes snakes. Lizards are a large and widespread group of Reptiles of the order Squamata, with nearly 5000 species and ranging across all continents except Squamata (scaled reptiles is the largest recent order of Reptiles including Lizards and Snakes Members of the order are distinguished by A snake is an elongate Reptile of the suborder Serpentes Like all reptiles snakes are covered in scales. This classification is rarely used today because as Sauria so-defined is a paraphyletic group. In Phylogenetics, a group of organisms is said to be paraphyletic if the group contains its most recent common ancestor but does not contain all
References
- Callaway, J. M. (1997), Ichthyosauria: Introduction, in JM Callaway & EL Nicholls (eds. ), Ancient Marine Reptiles. Academic Press, pp. 3-16.
External links
- Sauria cladogram
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