Search results
Results from the WOW.Com Content Network
Reptile skin is covered with scutes or scales which, along with many other characteristics, distinguish reptiles from animals of other classes. They are made of alpha and beta-keratin and are formed from the epidermis (contrary to fish, in which the scales are formed from the dermis ).
Snake scales are formed by the differentiation of the snake's underlying skin or epidermis. [7] Each scale has an outer surface and an inner surface. The skin from the inner surface hinges back and forms a free area which overlaps the base of the next scale which emerges below this scale. [8] A snake hatches with a fixed number of scales.
Squamata (/ s k w æ ˈ m eɪ t ə /, Latin squamatus, 'scaly, having scales') is the largest order of reptiles, comprising lizards and snakes.With over 12,162 species, [3] it is also the second-largest order of extant (living) vertebrates, after the perciform fish.
The skin is slimy and bears ringlike markings or grooves and may contain scales. [ 2 ] Modern caecilians are a clade , the order Gymnophiona / ˌ dʒ ɪ m n ə ˈ f aɪ ə n ə / (or Apoda / ˈ æ p ə d ə / ), one of the three living amphibian groups alongside Anura ( frogs ) and Urodela ( salamanders ).
This category is populated by using the |needs-photo=yes parameter in the {{WikiProject Amphibians and Reptiles}} (previously {{WikiProject Amphibians and Reptiles}}) banner. The Free Image Search Tool may be able to locate suitable images on other web sites. The Image Existence Checker shows articles in this list that have images.
Its skin is filled with capillaries that penetrate the epidermis, allowing gas exchange. Its skull shows evidence of muscles not found in any other organism. [ 6 ] The Vienna specimen of Atretochoana is a large caecilian at a length of 72.5 cm (28.5 in), [ 7 ] while the Brasília specimen is larger still at 80.5 cm (31.7 in). [ 8 ]
Beta-keratin (β-keratin) is a member of a structural protein family found in the epidermis of reptiles and birds. [1] [2] Beta-keratins were named so because they are components of epidermal stratum corneum rich in stacked beta sheets, in contrast to alpha-keratins, intermediate-filament proteins also found in stratum corneum and rich in alpha helices. [3]
Reptiles of North America: A Guide to Field Identification. Golden Press. New York. 240 pp. ISBN 0-307-13666-3. (Eumeces obsoletus, pp. 80–81.) Stebbins, R.C. 2003. A Field Guide to Western Reptiles and Amphibians, Third Edition. The Peterson Field Guide Series ®. Houghton Mifflin. Boston and New York. xiii + 533 pp. ISBN 0-395-98272-3.