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Scutes on an alligator foot A scute ( / s k j uː t / ⓘ ) or scutum ( Latin : scutum ; plural: scuta " shield ") is a bony external plate or scale overlaid with horn, as on the shell of a turtle , the skin of crocodilians , and the feet of birds .
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.
Typically, 11 or 12 pairs of marginal scutes rim the carapace. [8] Five vertebral scutes run down the carapace's midline, while five pairs of costal scutes border them. [21] The nuchal scute is located at the base of the head. [21] The carapace connects to the plastron by three pairs of inframarginal scutes forming the bridge of the shell. [21]
Efforts are also being made to educate the public on the shortnose sturgeon. Scientists are working with students and teachers to learn more about the movements, behavior, and threats to sturgeons. An example of this initiative is the SCUTES program—Students Collaborating to Undertake Tracking Efforts for Sturgeon. [13]
[8] [9] The outer shell is composed of ossified dermal scutes covered by nonoverlapping, keratinized epidermal scales, which are connected by flexible bands of skin. This armor covers the back, sides, head, tail, and outside surfaces of the legs.
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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.
Scutes are similar to scales and serve the same function. Unlike the scales of fish, which are formed from the epidermis, scutes are formed in the lower vascular layer of the skin and the epidermal element is only the top surface. Forming in the living dermis, the scutes produce a horny outer layer, that is superficially similar to that of scales.