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Zebra-tailed lizards range in size from 2.5 to 4 inches (64 to 102 mm) in snout-to-vent length (SVL). These lizards are grey to sandy brown, usually with a series of paired dark gray spots down the back, becoming black crossbands on the tail. The underside of the tail is white with black crossbars.
Two subspecies are recognized within P. thalassinus; P. t. thalassinus inhabits the Cape region, and P. t. repens ranges north of the isthmus of La Paz.P. t. repens differs by having a thin, black, postorbital stripe; one row of scales between the nasal and the supralabials as opposed to two, and reaching a maximum snout-to-vent length of 111 mm as opposed to 162 mm. Genetic studies indicate ...
The species is widely found in its native range and is considered common, often being seen in yards, or as the name implies, on fences. As the ventral abdomen of an adult is characteristically blue, it is also known as the blue-belly. Two western fence lizards have been reported with duplicated or forked tails, presumably following an autotomy. [2]
The hemipenis is the intromittent organ of Squamata, [4] which is the second largest order of vertebrates with over 9,000 species distributed around the world. They differ from the intromittent organs of most other amniotes such as mammals, archosaurs and turtles that have a single genital tubercle, as squamates have the paired genitalia remaining separate. [5]
Reptiles, from Nouveau Larousse Illustré, 1897–1904, notice the inclusion of amphibians (below the crocodiles). In the 13th century, the category of reptile was recognized in Europe as consisting of a miscellany of egg-laying creatures, including "snakes, various fantastic monsters, lizards, assorted amphibians, and worms", as recorded by Beauvais in his Mirror of Nature. [7]
Lizard is the common name used for all squamate reptiles other than snakes (and to a lesser extent amphisbaenians), encompassing over 7,000 species, [1] ranging across all continents except Antarctica, as well as most oceanic island chains.
The small reptile would have likely roamed the land of what is today southern Brazil, when the world was much hotter. The fossil has been identified as a new silesaurid, an extinct group of reptiles.
Reptiles (Late Latin for creeping or crawling) do not have an aquatic larval stage, and in this way are unlike amphibians. Most reptiles are oviparous, although several species of squamates are viviparous , as were some extinct aquatic clades [ 25 ] — the fetus develops within the mother, contained in a placenta rather than an eggshell .