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This is an accepted version of this page This is the latest accepted revision, reviewed on 11 December 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 ...
Diagram of crocodilian heart and circulation. The crocodilian has perhaps the most complex vertebrate circulatory system. It has a four-chambered heart and two ventricles, an unusual trait among extant reptiles. [86] Both have left and right aorta, connected by a hole called the Foramen of Panizza. [87]
Like most reptiles, an iguana has a three-chambered heart with two atria, one ventricle, and two aortae with a systemic circulation. [14] The muscles of an iguana are very light in color due to the high proportion of fast-twitch, glycolytic muscle fibers (type A).
Basal non-mammalian synapsids ("mammal-like reptiles") traditionally also sort under class Reptilia as a separate subclass, [27] but they are more closely related to mammals than to living reptiles. Considerations like these have led some authors to argue for a new classification based purely on phylogeny, disregarding the anatomy and physiology.
Coauthor Perillo of the University of Bonn studied the histology, or microscopic anatomy, of the ichthyosaur bones and discovered that the reptile was likely still growing at the time of its death ...
Monitor lizards have a high aerobic scope [23] [25] that is afforded, in part, by their heart anatomy. Whereas most reptiles are considered to have three-chambered hearts, the hearts of monitor lizards – as with those of boas and pythons – have a well developed ventricular septum that completely separates the pulmonary and systemic sides of ...
The pelvic anatomy of Cricosaurus and other metriorhynchids [41] and fossilized embryos belonging to the non-archosaur archosauromorph Dinocephalosaurus, [42] together suggest that the lack of viviparity among archosaurs may be a consequence of lineage-specific restrictions.
Snakes and other non-archosaur (crocodilians, dinosaurs + birds and allies) reptiles have a three-chambered heart that controls the circulatory system via the left and right atrium, and one ventricle. [76] Internally, the ventricle is divided into three interconnected cavities: the cavum arteriosum, the cavum pulmonale, and the cavum venosum. [77]