Lab 7

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Author:
lndsyfree
ID:
273158
Filename:
Lab 7
Updated:
2014-05-04 19:08:19
Tags:
wfcb
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Description:
Rodentia II
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  1. Myomorpha
    • Suborder within the Order Rodentia
    • Consists of the Family Dipodidae,
  2. Dipodidae
    • Family within the Suborder Myomorpha
    • Jerboas, jumping mice, birch mice
    • 1. infraorbital canal large, oval, open anteriorly
    • 2. hindlimbs elongated in all genera
    • 3. Nasal may extend anteriorly beyond level of upper incisors
  3. Cricetidae
    • Family within the Suborder Myomorpha
    • Contains subfamilies Arvicolinae and Sigmodontinae
  4. Arvicolinae
    • Subfamily within the Family Cricetidae
    • Voles, lemmings, and muskrat
    • 1. characteristic "Christmas tree" shape to teeth
  5. Sigmodontinae
    • Subfamily within the Family Cricetidae
    • New World rats and mice
  6. Muridae
    • Family within the Suborder Myomorpha
    • Gerbils
    • 1. Lacrimal enlarged and forming a conspicuous ledge over the anterior margin of the orbit
  7. Hystricomorpha
    • Suborders within the Order Rodentia
    • 1. Lower jaw hystricognathous
  8. Hystricidae
    • Family within the suborder Hystricomorpha
    • Old World porcupines
    • No specimens in lab, only quills
    • 1. occlusal surface of cheekteeth flat w/ folds forming islands
  9. Erethizontidae
    • Family within the Suborder Hystricomorpha
    • New World porcupines
    • 1. Smaller than Old World
    • 2. occlusal surface of cheekteeth flat, w/ narrow or wide enamel folds
  10. Chinchillidae
    • Family within the suborder Hystricomorpha
    • Chinchillas
    • 1. Lacrimal canal w/ large opening on side of rostrum at front end of infraorbital canal
    • 2. occlusal surface of cheekteeth flat, consisting of a series of transverse plates
  11. Caviidae
    • Family within the Suborder Hystricomorpha
    • Guinea pigs/capybara included
    • 1. Lacrimal canal w/ small opening on side of rostrum at edge of infraorbital canal
    • 2. Lower jaw w/ prominent ridge and groove on lateral surface
    • 3. Upper toothrows strongly convergent anteriorly
  12. Myocastoridae
    • Family within the Suborder Hystricomorpha
    • Nutria
    • 1. hindfeet webbed
    • 2. infraorbital foramen very large
    • 3. paraoccipital process relatively long, well-separated from bulla
    • 4. No groove on lower jaw; angular process strongly deflected

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