B240Reptiles-1[1]

B240Reptiles-1[1] - Reptiles: The first Amniotes Amniotes...

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Reptiles: The first Amniotes
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Amniotes Amniotes diverged from amphibians and became increasingly adapted to land.
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Amniotic Egg The biggest step in the evolution of reptiles and their descendants was the amniotic egg It allowed fully terrestrial reproduction and large offspring storage of wastes (allowing large size) gas exchange (also for larger size) Provides a moist environment and shock absorption Shell protects the embryo.
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Three major lineages of amniotes: Synapsida , which includes mammals Anapsida (some people think it includes turtles, too) Diapsida , which includes most “reptiles,” and the birds Reptiles
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Reptilian Improvements for Life on Land Amniotic Egg allowing larger offspring in dry habitats
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Reptilian Improvements for Life on Land Scaly keratinized epidermis (to prevent water loss) Better limb suspension for better mobility Negative pressure ventilation of the lungs More efficient heart. 3-chambered, but with a partition that separates oxygenated and spent blood. Internal fertilization Better control of body temperature for increased activity
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Ways of Controlling Body Temperature Endotherm Body temperature depends on internal source of heat Ectotherm Body temperature depends on environment Source of Body
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B240Reptiles-1[1] - Reptiles: The first Amniotes Amniotes...

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