A Key to the Skulls of North American Mammals - download pdf or read online

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

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___,. Fig. 8. ,,. Fig. 9. Chlorocebus* Greatest length of skull 97mm Fig. 10. Macaca* Greatest length of skull 105mm 19 RODENTIA 1. Suborder H ystricognathi .... 2 -Infraorbital aperture less than foramen magnum in size; cheek teeth 5/4, 4/4, 4/3, or 3/3, usually vertical and set in parallel rows (if not, then infraorbital canal small) ......... Suborder Sciurognathi .... 5 2. -Tooth crowns with a transverse laminate pattern; incisors white ................................................................................................................

Myodes Greatest length of skull 25mm Fig. 62. Dicrostonyx Greatest length of skull 27mm 41 Fig. 63. Microtus Greatest length of skull 30mm Fig. 64. Neofiber Greatest length of skull 45mm Fig. 65. Lemmiscus Greatest length of skull 25mm 42 LAGOMORPHA 1. -Supraorbital processes absent; jugal projecting back almost to auditory meatus, farming a long spine; fenestrae on side of rostrum not covered with bony latticework; dental fom1ula 12/1 CO/O P3/2 M2/3 ... Ochotonidae ..... Ochotona (Fig. 66) -Supraorbital processes present, divided into antorbital and postorbital portions; jugal extending only approximately halfway to auditory meatus; fenestrae in side of rostrum covered by bony latticework; dental formula 12/1 CO/O P3/2 M3/3 ..............................................................

Sigmodon Greatest length of skull 40mm Fig. 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 .............................................

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


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