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The squamosal is a skull bone found in most reptiles, amphibians, and birds. In fishes, it is also called the pterotic bone. [1] In most tetrapods, the squamosal and quadratojugal bones form the cheek series of the skull. [2] The bone forms an ancestral component of the dermal roof and is typically thin compared to other skull bones. [3]
The frog is triangular in shape. The frog is a part of a horse hoof, located on the underside, which should touch the ground if the horse is standing on soft footing. The frog is triangular in shape, and extends midway from the heels toward the toe, covering around 25% of the bottom of the hoof. [1] [page needed]
This diagram, in the form of a tree, shows how each frog family is related to other families, with each node representing a point of common ancestry. It is based on Frost et al. (2006), [ 44 ] Heinicke et al. (2009) [ 45 ] and Pyron and Wiens (2011).
This stylised bird skeleton highlights the synsacrum Pelvis of a Gull; formed by the Synsacrum (fused vertebrae placed centrally) and the two innominate bones either side. The synsacrum is a skeletal structure of birds and other dinosaurs, in which the sacrum is extended by incorporation of additional fused or partially fused caudal or lumbar ...
Anatomy of a wood frog tadpole (Lithobates sylvaticus) As a frog tadpole matures it gradually develops its limbs, with the back legs growing first and the front legs second. The tail is absorbed into the body using apoptosis. Lungs develop around the time as the legs start growing, and tadpoles at this stage will often swim to the surface and ...
Skull diagram of Champsosaurus, showing the pterygoid bone in red-violet (visible in inferior view at lower right and posterior to the ectopterygoid bone in lateral view at top) The pterygoid is a paired bone forming part of the palate of many vertebrates, behind the palatine bones. [1]
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The carpus and tarsus of land vertebrates primitively had three rows of carpal or tarsal bones. Often, some of these have become lost or fused in evolution. Accessory bones amidst tarsals. Three proximal bones. Humans hold all three in their hands.