Hystricomorphous

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A type of rodent zygomasseteric system where the infraorbital foramen, which runs from the anterior part of the orbit to the outside of the rostrum, becomes very large. Through it, part of a much-expanded medial masseter passes to originate on the side of the rostrum anterior to the zygomatic arch. This condition is found in porcupines (both New and Old World families), guinea pigs, jerboas, and a large number of other families.

Source: http://animaldiversity.ummz.umich.edu/site/topics/mammal_anatomy/rodent_jaws.html , retrieved on 05.15.2005

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