< 5 0 % ▁head ▁and ▁body ▁length ), ▁broad ▁ro str um , ▁tri angular - sh aped ▁bra inc ase , ▁inf ra orb ital ▁canal ▁o void ▁shape ▁and ▁does ▁not ▁extend ▁vent r ally ▁to ▁the ▁roof ▁of ▁the ▁pal ate , ▁z yg om atic ▁plate ▁absent ▁or ▁much ▁reduced , ▁nas ol ac r imal ▁canal ▁inside ▁inf ra orb ital ▁canal , ▁in cis ive ▁foram ina ▁small ▁to ▁medium - s ized , ▁extensive ▁neck ▁mus cul ature ▁and ▁prominent ▁points ▁of ▁attachment ▁on ▁the ▁oc cip it um , ▁minimal ▁reduction ▁in ▁M 3 ▁relative ▁to ▁M 1 ▁and ▁M 2 , ▁and ▁a ▁distinct ▁orientation ▁of ▁the ▁man ub rium ▁of ▁the ▁m alle us ▁b one ." ▁ ▁Classification ▁The ▁sp al ac ids ▁are ▁class ified ▁in ▁three ▁sub famil ies , ▁six ▁gener a , ▁and ▁ 3 7 ▁species . ▁ ▁F AM IL Y ▁SP AL AC ID AE ▁Sub family ▁My osp al ac inae ▁- ▁z ok ors ▁Gen us ▁My osp al ax ▁My osp al ax ▁my osp al ax ▁species ▁group ▁False ▁z ok or , ▁M . ▁asp al ax ▁Si ber ian ▁z ok or , ▁M . ▁my osp al ax ▁My osp al ax ▁ps il urus ▁species ▁group ▁Trans ba ikal ▁z ok or , ▁M . ▁ps il urus ▁Gen us ▁E osp al ax ▁Chinese ▁z ok or , ▁E . ▁font an ier ii ▁Roth