family didelphidae virginia opossum—didelphis virginianagoheen/mammalogy course/lab_2.pdf ·...
TRANSCRIPT
![Page 1: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/1.jpg)
Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis virginiana
1) dental formula = I5/4 C1/1 P3/3 M4/4 2) prominent sagittal crest 3) fenestrated palatines 4) angular process medial from mandible
![Page 2: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/2.jpg)
![Page 3: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/3.jpg)
Order Soricomorpha, Family Soricidae—shrews
1) incomplete zygomatic arches 2) at least some teeth tipped with red or black 3) cheek teeth dilambdodont 4) bicuspid I1
![Page 4: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/4.jpg)
pygmy shrew—Sorex (Microsorex) hoyi
1) only 3 unicuspids readily visible from side
1 2 4
![Page 5: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/5.jpg)
![Page 6: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/6.jpg)
water shrew—Sorex palustris
1) skull length > 19 mm (not in key) 2) rostrum short, relative to S. bendirii
![Page 7: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/7.jpg)
Pacific water shrew—Sorex bendirii
1) skull length > 19 mm (not in key) 2) rostrum long, relative to S. palustris
![Page 8: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/8.jpg)
Sorex bendirii
Sorex palustris
![Page 9: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/9.jpg)
arctic shrew—Sorex arcticus masked shrew—Sorex cinereus tundra shrew—Sorex tundrensis
1 2 3 4
1) 3rd unicuspid not smaller than 4th
![Page 10: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/10.jpg)
Sorex cinereus Sorex arcticus
Sorex tundrensis
![Page 11: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/11.jpg)
dusky shrew—Sorex monticolus Trowbridge’s shrew—Sorex trowbridgii
vagrant shrew—Sorex vagrans
1) 3rd unicuspid smaller than 4th
4 3
![Page 13: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/13.jpg)
Order Soricomorpha, Family Talpidae—moles
1) complete zygomatic arches 2) teeth entirely white
![Page 14: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/14.jpg)
shrew-mole—Neurotrichus gibbsii
1) dentition: I3/3 C1/1 P2/2 M3/3 2) auditory bullae incompletely formed
![Page 15: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/15.jpg)
![Page 16: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/16.jpg)
coast mole—Scapanus orarius
1) dentition: I3/3 C1/1 P4/4 M3/3 2) auditory bullae completely formed 3) skull < 40 mm
![Page 17: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/17.jpg)
coast mole—Scapanus orarius
![Page 18: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/18.jpg)
Townsend’s mole—Scapanus townsendii
1) dentition: I3/3 C1/1 P4/4 M3/3 (usually) 2) auditory bullae completely formed 3) skull > 40 mm
![Page 19: Family Didelphidae Virginia opossum—Didelphis virginianagoheen/mammalogy course/lab_2.pdf · Order Didelphimorphia, Family Didelphidae—American opossums Virginia opossum—Didelphis](https://reader033.vdocument.in/reader033/viewer/2022050715/5e0431e3d0f48755734ccdc7/html5/thumbnails/19.jpg)
Townsend’s mole—Scapanus townsendii