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The scales may be ossified or tubercular, as in the case of lizards, or modified elaborately, as in the case of snakes. [1] The scales on the top of lizard and snake heads has also been called pileus, after the Latin word for cap, referring to the fact that these scales sit on the skull like a cap. [2]
Scales usually vary in size, the stouter, larger scales cover parts that are often exposed to physical stress (usually the feet, tail and head), while scales are small around the joints for flexibility. Most snakes have extra broad scales on the belly, each scale covering the belly from side to side.
Lizards and snakes share a movable quadrate bone, distinguishing them from the rhynchocephalians, which have more rigid diapsid skulls. [5] Some lizards such as chameleons have prehensile tails, assisting them in climbing among vegetation. [6] As in other reptiles, the skin of lizards is covered in overlapping scales made of keratin. This ...
Common rough-scaled lizards are medium-sized lizards each with a small head, body, and a long tail. The frontonasal is divided and has small body scales in 42 to 58 rows at the midline. [2] The backs of these lizards are brownish grey with narrow dark blotches and rows of pale spots. [2]
Glass (legless) lizards look remarkably snake-like. We talked to wildlife experts to find out how to tell the difference. Is that a snake or one of NC’s three legless lizards?
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Non-European lizards such as Sphaerodactylus macrolepis also display keeled scales. [3] Klauber (1997) describes how the keels on the scales of Crotalus rattlesnakes are particularly strong mid-dorsally, but gradually weaken on the lateral rows with the ventral scales being smooth. He then references a 1938 study, stating that it "has suggested ...
Like the 'long scales', the skeletal features of Longisquama are equally difficult to diagnose. As a result, Longisquama has been related by scientists to many different sauropsid groups. Sharov determined that it was a " pseudosuchian " (a "primitive" archosaur , but as an archosaur a relatively derived reptile) on the basis of two features: a ...