Pantestudines (Includes turtles and their extinct relatives)
Archosauromorpha (Includes archosaurs and their extinct relatives)
? †Ichthyosauromorpha (Includes ichthyosaurs and relatives)
? †Sauropterygia (Includes plesiosaurs and relatives)
? †Thalattosauria (Includes thalattosaurs)
Archelosauria is a clade grouping turtles and archosaurs (birds and crocodilians) and their fossil relatives, to the exclusion of lepidosaurs (the clade containing lizards, snakes and the tuatara). The majority of phylogenetic analyses based on molecular data (e.g. DNA and proteins) have supported a sister-group relationship between turtles and archosaurs. On the other hand, Archelosauria had not been historically supported by most morphological analyses, which have instead found turtles to either be descendants of parareptiles, early-diverging diapsids outside of Sauria, or close relatives of lepidosaurs within the clade Ankylopoda. Some recent morphological analyses have also found support for Archelosauria.
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Archelosauria is a clade grouping turtles and archosaurs (birds and crocodilians) and their fossil relatives, to the exclusion of lepidosaurs (the clade...
Archelosauria. Since Pantestudines may encompass the entire aquatic reptile order Sauropterygia, this means that Archosauromorpha (as Archelosauria)...
as more closely related to archosaurs than to lepidosaurs as part of Archelosauria, Sauria can be considered the crown group of diapsids, or reptiles in...
of modern taxa, Lepidosauria can be considered the sister taxon to Archelosauria, which includes Testudines (turtles), Aves (birds) and Crocodilia (crocodilians)...
morphology-based analyses usually do not support a turtle-archosaur clade (Archelosauria), Bhullar & Bever (2009) identified a laterosphenoid bone, typical of...
crocodilians, and in turtles, which may be grouped with archosaurs in Archelosauria. Despite being lepidosaurs, as lizards and tuatara are, snakes lack...
proportionally shorter legs makes this less effective. No extant members of Archelosauria are known to be long-distance hunters, though various bird species may...
instead placing the three marine reptile groups within an expanded Archelosauria. Clade Ichthyosauromorpha Order Hupehsuchia Clade Ichthyosauriformes...
which supports Archelosauria (the grouping of turtles and archosaurs), and other recent cladistic analyses have supported Archelosauria over Ankylopoda...
suggested that they belong in the clade Archosauromorpha (also known as Archelosauria). Below are many of the possible classifications of Testudines and Testudinata:...
mind placed turtles firmly within diapsids, or, more commonly, within Archelosauria. All molecular studies have strongly upheld the placement of turtles...
typically have 14 ossicles in the ring, though this can vary. Within Archelosauria (turtles, birds, crocodilians, and relatives), only birds and turtles...
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