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A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomic bilaterial animal belonging to the phylum Chordata (/ k ɔːr ˈ d eɪ t ə / kor-DAY-tə).All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa.
2.2.2.5.2 Class Reptilia: Reptiles. 2.2.2.5.3 Class ... This article contains a list of all of the classes and orders that are located in the Phylum Chordata ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 4 October 2024. Group of animals including lepidosaurs, testudines, and archosaurs This article is about the animal class. For other uses, see Reptile (disambiguation). Reptiles Temporal range: Late Carboniferous–Present PreꞒ Ꞓ O S D C P T J K Pg N Tuatara Saltwater crocodile Common box turtle ...
Sauria is the clade of diapsids containing the most recent common ancestor of Archosauria (which includes crocodilians and birds) and Lepidosauria (which includes squamates and the tuatara), and all its descendants. [1] Since most molecular phylogenies recover turtles as more closely related to archosaurs than to lepidosaurs as part of ...
The Lepidosauria (/ ˌlɛpɪdoʊˈsɔːriə /, from Greek meaning scaled lizards) is a subclass or superorder of reptiles, containing the orders Squamata and Rhynchocephalia. Squamata includes lizards and snakes. [2] Squamata contains over 9,000 species, making it by far the most species-rich and diverse order of non-avian reptiles in the ...
The Cryptodira (Greek: hidden neck) are a suborder of Testudines that includes most living tortoises and turtles. Cryptodira differ from Pleurodira (side-necked turtles) in that they lower their necks and pull the heads straight back into the shells, instead of folding their necks sideways along the body under the shells' marginals.
This separation is based primarily on morphological characteristics between family groups; however, more recently, the comparison of mitochondrial DNA has played its part. As with most taxonomic classifications, there are many different interpretations of the evolutionary relationships.
Crocodylia, as coined by Wermuth, [3] in regards to the genus Crocodylus appears to be derived from the ancient Greek [8] κρόκη (kroke)—meaning shingle or pebble—and δρîλος or δρεîλος (dr (e)ilos) for "worm". The name may refer to the animal's habit of resting on the pebbled shores of the Nile. [9]