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2.2.2.5.2 Class Reptilia ... Download as PDF; ... This article contains a list of all of the classes and orders that are located in the Phylum Chordata ...
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.
Chelidae is one of three living families of the turtle suborder Pleurodira, and are commonly called Austro-South American side-neck turtles. [ 2 ] The family is distributed in Australia, New Guinea, parts of Indonesia, and throughout most of South America. It is a large family of turtles with a significant fossil history dating back to the ...
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.
The family Gekkonidae is a member of the infraorder Gekkota, which seems to have first emerged during the Jurassic period (201-145 million years ago). Eichstaettisaurus schroederi is recognized as one of the earliest examples of an ancestral gecko species. Members of the genus Eichstaettisaurus display morphological adaptations associated with ...
Iguanidae is thought to be the sister group to the collared lizards (family Crotaphytidae); the two groups likely diverged during the Late Cretaceous, as that is when Pristiguana and Pariguana, the two earliest fossil genera, are known from. The subfamily Iguaninae, which contains all modern genera, likely originated in the earliest Paleocene ...