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Lecture 88

BIO SCI 94 Lecture Notes - Lecture 88: Placentalia, Marsupial, Monotreme


Department
Biological Sciences
Course Code
BIO SCI 94
Professor
Michael Clegg
Lecture
88

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Mammalia (lab)
Heterodont(differenttypeofteeth)dentition
-
Singleboneinlowerjaw-
Middleearcomposedofthreebones-
Endothermic-
4chamberedheartwithleftaorticarch
-
Musculardiaphragm
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Mammaryglands
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Hair
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RememberthefollowingdistinctivefeaturesoftheclassMammalia:1.
Subclassmonotremata(platypusandechidnas)
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SubclassTheria‐ marsupialiaandplacentalia
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KnowthefollowingclassificationoftheclassMammalia:2.
Lookatthediversityofmammalteeth.CompareaCarnivore(dogorfox),severalherbivores(adeer,
ahorseorazebra,andarabbit‐ notethepairedincisors)andaninsectivore(bat)
3.
(eatotheranimals)
Carnivore:

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(eatplants)
Herbivores:
horse rabbit
Insectivore:
(eatinsects,othersmallarthropods&worms)
bat
Foodthatareturgid,likecellsoffruitorhardbutbrittle,likelargeseedsandnutsmustbeburst
openorfracturedtopreparethemfordigestion
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Moreeffectiveisthecrushingandrollingactionofatoothcombinationresemblinga
mortarandpestle.
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Permitssometransversegrindingofthepestle,andfacilitatesthecleaningofcrushed
foodfromthemortar.
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Tearingorpuncturingprey.(insectivores)-
Teethwithsharpconesandbladesarebestforpenetratingandshearingtough
exoskeletons.
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Describehowthesize,shape,andpresenceorabsenceofvariousteethgivescluestodiet.4.

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Teethtendtobenumerousandvaried,butnothighlyspecializedforshearingorgrinding.-
Cheekteetharemoderatelybroad,withlowcuspsandbasinssuitableforcrushing.
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Omnivorouswithavarieddiet…
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Cheekteetharesimilartooneanother….Functionalpremolarsbecomemolariformin
nature.
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Theocclusualsurfacesoftheteethareflatandlargeinarea.
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Toprovideforlongwear,therootsaredeepinthejawoftheounganimalandthecrownis
high.
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Eatingcoarsevegetation(herbivores)
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ObserveexamplesofBunodont(human),selenodont(goatordeer)andlophodont(horse)cheek
teeth.Drawandlabeleach.
5.
Comparethevariousteethinthejawofalizardandamammal(cat).Howdoesthemammalian
dentitiondiffer?Drawandlabeltheincisors,canines,premolar,andmolarofthecatskull.
6.
Lizard=homodontteeth(same)
Cat=heterdontteeth(different)
Lizard
Cat
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