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Dermal scutes are also found in the feet of birds and tails of some mammals, and are believed to be the primitive form of dermal armour in reptiles. The term is also used to describe the heavy armour of the armadillo and the extinct Glyptodon , and is occasionally used as an alternative to scales in describing snakes or certain fishes, such as ...
Overlying the boney elements are a series of scutes, which are made of keratin and are a lot like horn or nail tissue. In the center of the carapace are five vertebral scutes and out from these are four pairs of costal scutes. Around the edge of the shell are 12 pairs of marginal scutes.
Value is decided in two ways: size and grade. Greater width increases the value of the skin and is measured across the third raised scute. The grade is measured on a scale of damage to the skin and value is deducted by 25% at each level. [8] Therefore, skin value can drop significantly if the quality is not maintained by careful handling.
In first grade students are assessed on knowledge and skills and they are graded in a descriptive way rather than using marks. In second and third grade students are assessed on subjects including Latvian language, minority language, math, and foreign languages and are graded using the 10 point scale.
Snake scales may be modified to form fringes, as in the case of the eyelash bush viper, Atheris ceratophora, or rattles as in the case of the rattlesnakes of North America. [ 8 ] Certain primitive snakes such as boas , pythons and certain advanced snakes such as vipers have small scales arranged irregularly on the head.
Squamata and Rhynchocephalia form the subclass Lepidosauria, which is the sister group to the Archosauria, the clade that contains crocodiles and birds, and their extinct relatives. Fossils of rhynchocephalians first appear in the Early Triassic , meaning that the lineage leading to squamates must have also existed at the time.
The articulations with neighboring scutes are located on the ventral side, and the dorsal surface is strongly sculptured while the ventral surface of wings is smooth and contains many small openings. "The scutes have very wide wings and cover practically the whole upper part of the trunk. The tail scutes are narrower, the last of which lack wings.
A healthy female bog turtle can lay between 30 and 45 eggs in her lifetime, but many of the offspring do not survive to reach sexual maturity. [53] Typically, older females lay more eggs than younger ones. [51] The eggs are white, elliptical, and on average 3.4 centimeters (1.3 in) long and 1.5 centimeters (0.59 in) wide. [54]
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