Claw - Wikipedia
A claw is a curved, pointed appendage found at the end of a toe or finger in most amniotes (mammals, reptiles, birds). Some invertebrates such as beetles and spiders have somewhat similar fine, hooked structures at the end of the leg or tarsus for gripping a surface as they walk.
Do lizards have claws or talons? - reptileknowledge.com
Most reptiles have well-developed claws. Most lizards have toes ending in stout claws. In snakes, feet and claws are absent, but in many boids such as Boa constrictor, remnants of highly reduced hind-limbs emerge with a single claw as "spurs" on each side of the anal opening.
Development, structure, and protein composition of reptilian claws …
2020年10月4日 · Abstract Here, we review the development, morphology, genes, and proteins of claws in reptiles. Claws likely form owing to the inductive influence of phalangeal mesenchyme on the apical epidermis o...
Development, structure, and protein composition of reptilian claws …
Claws likely form owing to the inductive influence of phalangeal mesenchyme on the apical epidermis of developing digits, resulting in hyperproliferation and intense protein synthesis in the dorsal epidermis, which forms the unguis.
Development, comparative morphology and cornification of …
2009年5月18日 · The development of claws in different reptiles and their cornification are analyzed using histological, ultrastructural and autoradiographic methods.
Reptile - Clinging, Climbing, Adaptations | Britannica
2024年10月25日 · Some reptiles have claws, the most common clinging structures in vertebrates. Other adaptations include footpads, limbs, and wings. The external covering of reptiles is dry and composed of scales.
Claw | Structure, Function, Adaptation, & Facts | Britannica
In zoology, a claw is a narrow, arched structure that curves downward from the end of a digit in birds, reptiles, many mammals, and some amphibians. It is a hardened (keratinized) modification of the epidermis.
Development, structure, and protein composition of reptilian claws …
2020年10月4日 · The development of claws in different reptiles and their cornification are analyzed using histological, ultrastructural and autoradiographic methods to indicate that the pattern of growth of reptilian and probably avian claws is different from that of mammals.
Development, comparative morphology and cornification of …
2009年5月18日 · The development of claws in different reptiles and their cornification are analyzed using histological, ultrastructural and autoradiographic methods. Claws develop at the tip of digits in relation to the growth of the terminal phalanx and appear as modified scales.
Morphological laws and functional claws | Journal of …
2021年3月31日 · Amplectorial claws found in predators such as kestrels and other birds that grasp onto prey typically have an enlarged muscle attachment site for powerful gripping. Those claws usually have a high level of curvature and a wide …
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