Download e-book for iPad: A Key to the Skulls of North American Mammals by THIES MONTE L

By THIES MONTE L

ISBN-10: 1465291717

ISBN-13: 9781465291714

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Extra info for A Key to the Skulls of North American Mammals

Sample text

46. Oryzomys Greatest length of skull 34mm 34 Fig. 47. Ochrotomys Greatest length of skull 25mm Fig. 48. Peromyscus Greatest length of skull 27mm Fig. 49. Podomys Greatest length of skull 30mm Fig. 50. Cricetus* Greatest length of skull 45mm 35 -Lateral margins of rostrum not parallel ....................................................................... 48 48. -Anterior cusp of M 1 aligned with outer (labial) row of cusps; skull 25mm or more in length .............................................

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 ...........................................................................

38. Geomys Greatest length of skull 48mm 31 Fig. 39. Zapus Greatest length of skull 24mm Fig. 40. Napaeozapus Greatest length of skull 24mm Fig. 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) ......................................................................................................................

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


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