Anatomy
The literature available on the anatomy of Sylvilagus insonus mainly concentrates on the skull and therefore distinguishing features of the Omilteme’s skull have been well described. The skull is large being approximately 78.0mm in length and 32.0mm in depth with a large palate and a wide braincase. The supraorbital process is flat, attached to the braincase and has two extensions (anterior and posterior). The anterior extension of the supraorbital process is attached to the skull while the posterior extension is slender and can be free of the brain case or attached with a slit in-between the process and the braincase. The supraoccipital shield is square shaped. The tympanic bullae are small and less than 12.3mm in length. The width of the basioccipital is less than 9mm. The width of the infraorbital canals is very narrow being less than 18.3mm. The width across the nasals is very narrow and their length is less than 32.1mm. They have medium-sized auditory bullae with a length of less than 9.6mm. The shield bullae have a shallow depth of less than 21.4mm. The skull also has a narrow basioccipital and is very broad across the carotid foramina.
The mouth consists of a mandible whose height is less than 36.3mm with a mandible ramus depth of less than 11.3mm. The incisive foramen and the diastema are short. The premaxillaries have dorsal extensions. They have large maxillary and mandibular toothrows. The Omilteme Cottontail is heterodont with a total of 28 teeth. They have incisors, premolars and molars, therefore lacking canines. The dental formula is I 2/1, C 0/0, P 3/2, M 3/3. The length of the first upper incisor is generally less than 7.5mm.
Read more about this topic: Omilteme Cottontail
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“Man is a shrewd inventor, and is ever taking the hint of a new machine from his own structure, adapting some secret of his own anatomy in iron, wood, and leather, to some required function in the work of the world.”
—Ralph Waldo Emerson (1803–1882)