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The jugal bone is located on either side of the skull in the circumorbital region. It is the origin of several masticatory muscles in the skull. [1] The jugal and lacrimal bones are the only two remaining from the ancestral circumorbital series: the prefrontal, postfrontal, postorbital, jugal, and lacrimal bones.
Rabbits and hares move by jumping, pushing off with their strong hind legs and using their forelimbs to soften the impact on landing. Pikas lack certain skeletal modifications present in leporids , such as a highly arched skull, an upright posture of the head, strong hind limbs and pelvic girdle, and long limbs. [ 19 ]
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]
While largely similar to eastern cottontails (Sylvilagus floridanus) in appearance, the swamp rabbit differs in the sizes of its ears and skull; the former are much smaller, and the latter is larger. Additionally, the back portions of the swamp rabbit's hind legs are orange, in contrast to the tan or white feet of the eastern cottontail. [5]
A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull (at the sagittal suture) of many mammalian and reptilian skulls, among others. The presence of this ridge of bone indicates that there are exceptionally strong jaw muscles.
The Sumatran striped rabbit weighs 1.5 kg and is between 368 and 417 mm in total length, with a tail 17 mm long, skull length of 67–74 mm, hind foot length of 67–87 mm, and ear length of 34–45 mm. [3] It has black or dark brown stripes on a yellowish grey background that becomes rusty brown towards the rump; the fur on the underparts, on the inside of the legs and below the chin is whitish.
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The base of skull, also known as the cranial base or the cranial floor, is the most inferior area of the skull. It is composed of the endocranium and the lower parts of the calvaria . Structure