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Lecture 84

BIO SCI 94 Lecture Notes - Lecture 84: Nictitating Membrane, Internal Fertilization, Desiccation


Department
Biological Sciences
Course Code
BIO SCI 94
Professor
Michael Clegg
Lecture
84

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Reptilia (lab)
Waterproofscales
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Produceuricacidasnitrogenouswasteproduct-
Havethe"trueegg"(calledamnioticegg)
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Internalfertilization
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RememberthefollowingdistinctivefeaturesoftheclassReptilia:1.
Turtles
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Snakes-
Lizards
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Crocodiles/alligators
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Dinosaurs-
Beabletolistthesubgroupsofreptiles:2.
protectstheanimalfromscratchesandabrasionsmuchmoreeffectivelythanthethin
delicateskinofAmphibians.
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theReptilianskiniswaterproofandretainsbodymoisture,freeingtheanimalfromthe
necessityofremaininginadamporwetplacetoavoiddessication.
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Becauseoftheirimperviousskins,reptileshavebeenabletocolonizeamuchwidervariety
ofecologicalnichesthanhaveAmphibians
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thickscaleyskin,
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UnlikethenakedexposedeggoftheAmphibians,theReptileeggissurroundedbyahard
protectiveshell,whichprotectsthedevelopingembryoandalsotrapsfluidsandmoisture
insidetheegg,preventingitfromdryingout.
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developmentoftheamnioteegg.
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Whatfeaturesofthereptilesallowthemtobemuchmoresuccessfulonlandcomparedtothe
amphibians?
3.
Whatissodifferentaboutthereproductionandearlydevelopmentofthereptilescomparedtothe
amphibians?
4.
Althoughfewamphibiansdoreproducebyinternalfertilizationmanyreproduceexternally,in
comparisontoreptilesreproduceusinginternalfertilizationandexternaldevelopment.
Unlikethejellycoatedeggsofamphibianswhichhadtostaymoist,reptileswerethefirsttohave
"trueeggs"alsoknownasamnioteseggswhichweresurroundedbyahardprotectiveshell
whichprotectedthedevelopingembryoandalsotrappedfluidsandmoistureinsidetheegg
preventingitfromdryingout.

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Carapace,plastron,Anteriornares,hornybeak,eyelidswithnictitatingmembrane,tympanic
membrane,scutes,forelimbs,hindlimbs,tail,anus.
Knowthefollowingexternalstructuresformtheturtle:5.

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