March 29, 2017

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

By THIES MONTE L

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Example text

Skull short, rostrum and braincase as broad or broader than long; fore head vertical; entire braincase so elevated that base of foramen magnum is above level of top of rostrum ...................................................... Mormoopidae .... Mormoops (Fig. 84) -Skull slender and light, rostrum narrow and tapering; braincase sloping at fore head; occipital region marked off by a constriction ......................................... Phyllostomatidae ..... Macrotus (Fig. 85) 5. -Incisors 2/2; third molars minute or absent ...................................................................

I ctidomys (Fig. 27) 21. -Interorbital region relatively narrow and indented on each side with a V -shaped notch; base of notch often erase ............................................................................................... Glaucomys (Fig. 28) -Interorbital region relatively wide and not V-shaped ................................................. 22 22. -Anterior border of orbit ventrally opposite P 4 ; 3 transbullar septa visible on bullar surface as shallow transverse grooves .......................................................................

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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