“reptilian” vs mammalian dentition - university …courses.biology.utah.edu/rickart/5370/pdf...
TRANSCRIPT
![Page 1: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/1.jpg)
“REPTILIAN” vs MAMMALIANDENTITION
![Page 2: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/2.jpg)
MOLARS OF MESOZOICPROTOTHERIANS
![Page 3: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/3.jpg)
MOLARS OF MULTITUBERCULATES& MONOTREMES
MultituberculataPtilodus
MonotremataObdurodon Ornithorhynchus
![Page 4: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/4.jpg)
EVOLUTION OF THERIAN MOLARS
Tribosphenic
![Page 5: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/5.jpg)
THERIAN (TRIBOSPHENIC) MOLARS
(occlusal view)
(lateral view)
upper
lower
![Page 6: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/6.jpg)
TRIBOSPHENIC MOLAR OCCLUSION
![Page 7: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/7.jpg)
Quadrate or Bunodont(primate)
Dilambdodont(insectivore)
Variations on Tribosphenic molar
ectoloph
![Page 8: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/8.jpg)
MOLARS – crowns & roots
![Page 9: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/9.jpg)
Lophodont molar (murid rodents)
![Page 10: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/10.jpg)
Selenodont molar (artiodactyls)
![Page 11: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/11.jpg)
Loxodont molar
(elephant)
(capybara)
![Page 12: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/12.jpg)
DENTAL FORMULACanis lupus
I C P M3 1 4 2
Upper dentition(one side only)
1 1 4 3I c p m
Lower dentition(one side only)
3 1 4 2________3 1 4 3
(x 2) = 42
![Page 13: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/13.jpg)
DENTAL FORMULAS
![Page 14: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/14.jpg)
Extreme dentitions
Nine-banded armadillo (Dasypus)simplification and reduction
Common dolphin (Delphinus) simplification and multiplication
![Page 15: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/15.jpg)
EARLY MAMMAL GROUPS
![Page 16: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/16.jpg)
ORDER SYMMETRODONTA basal therians
Kuehneotheriumlate Triassic – early JurassicEurope
Vincelestesearly Cretaceus, Argentina
HadrocodiumearlyJurassic, China
![Page 17: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/17.jpg)
SYMMETRODONTSLoss of post-dentary bones in lower jaw
Hadrocodon (Docodont, Prototherian)
Hadrocodium (Symmetrodont, basal Therian)
![Page 18: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/18.jpg)
SYMMETRODONTMolar structure
![Page 19: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/19.jpg)
OLDEST MARSUPIAL?Sinodelphys -- early Cretaceous (China)
4 1 4 44 1 4 3 = 50
![Page 20: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/20.jpg)
OLDEST EUTHERIAN ?Eomaia -- early Cretaceous (China)
5 1 5 34 1 5 3
_______ = 54
![Page 21: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/21.jpg)
EARLY EUTHERIANUkhaatherium late Cretaceus, Mongolia
5 1 4 3_________ = 504 1 4 3
![Page 22: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/22.jpg)
Skulls of early therians
![Page 23: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/23.jpg)
Skulls of early therians
![Page 24: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/24.jpg)
EARLY METATHERIANORDER: DIDELPHIMORPHIAFamily: DidephildaeAlphadon (Late Createous, N. America)
5 1 3 44 1 3 4
= 50
![Page 25: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/25.jpg)
MARSUPIAL BIOGEOGRAPHY
To N. Americaearly diversification
(late Cretaceous)
Ameridelphiandiversification
(late Cretaceous)
AustralodelphianIsolation and diversification
(Tertiary)
Extinction on northern continents(mid Tertiary)
Reinvasion of N. America(Quaternary)
Asian origin?(early Cretaceous)
Isolation of southern continents
(late Cretaceous)
To S. America(early Cretaceous)
To Antarctica & Australia(early Tertiary)
![Page 26: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/26.jpg)
CLADOGRAM OF RECENTMARSUPIALS
(outgroups)
Australodelphia
Ameridelphia
![Page 27: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/27.jpg)
MARSUPIAL CLASSIFICATION
![Page 28: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/28.jpg)
Marsupial – Placental differencesCranial & dental morphology
Didelphis Canis
![Page 29: “REPTILIAN” vs MAMMALIAN DENTITION - University …courses.biology.utah.edu/rickart/5370/pdf lectures/Lecture 5.pdf · DENTAL FORMULA Canis lupus I C P M 3 1 4 2 Upper dentition](https://reader031.vdocument.in/reader031/viewer/2022022017/5b843c4e7f8b9aea498be57f/html5/thumbnails/29.jpg)
5 1 3 44 1 3 4
________ 3-5 1 4-5 33-4 1 4-5 3__________= 50 = 44-54