Download A Key to the Skulls of North American Mammals by THIES MONTE L PDF

By THIES MONTE L

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Sylvilagus Greatest length of skull 70mm 44 SORICOMORPHA 1. -Zygomatic arches complete; front pair of upper teeth moderately enlarged and projecting downward or only slightly forward, their longitudinal and lateral diameters appro){imately eciual; teeth white ........................................................... Talpidae ........ 2 -Zygomatic arches incomplete; front pair of teeth greatly enlarged and projecting conspicuously forward, about five times as long as wide, and bearing a small posterior cusp; at least anterior teeth tipped reddish or blackish ..........................

41. Rattus* Greatest length of skull 45mm Fig. 42. Mus* Greatest length of skull 22mm 32 with the lophs forming a sigmoid pattern; zygomatic plate cut back dorsally, revealing infraorbital canal on emarginate dorsal border .................................................................. Sigmodon (Fig. 45) -Molars without lophs, cusps normal; infraorbital canal not emarginate dorsally (except in Oryzomys and Cricetus) ......................................................................................................................

Oryzomys (Fig. 46) 3 -Supraorbital ridges absent; palate ending at plane of M ; no palatal pits; coronoid process small and weak; infraorbital canal with straight dorsal border; molars with cusps of outer and inner rows staggered ............................................................. 43 43. -Posterior palatine foramina closer to posterior palatal border than to anterior palatine foramina ...................................... Ochrotomys (Fig. 47) -Posterior palatine foramina equidistant from posterior palatal border and anterior foramina ...........................................................................

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