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Cards In This Set
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Tetrapod characteristics
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- limbs with feet and digits- separate head from neck and body- pharyngeal slits form ears and glands- some remained aquatic- fossil evidence of origins of tetrapods during Devonian and Carboniferous period
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Amphibians (salamanders, frogs and caecilians)
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- live in and out of water- moist skin for gas exchange- primitive lungs, sac without chambers- external fertilization, requires water- eggs resemble fish's-go through metamorphosis: absorb tail, shell gills, arm buds full of stem cells
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Order Urodela
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Salamanders
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Order Anura
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Frogs/toads
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Order Apoda
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Caecilians (legless and blind)
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Amniotes
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- reptiles, mammals and birds- evolved 370 mya- functional rib cage- named for egg- classified by holes in skull
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Amniotic egg
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Have 4 specialized extra embryonic membranes-amnion, chorion, yolk sac, allantois
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Amnion
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Shock absorber membrane
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Chorion
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Gas exchange membrane
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Yolk sac
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Provides nutrients for embryo
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Allantois
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Waste storage membrane
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Albumen
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Cytoplasm
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Shell
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Pores for gas exchange and protects embryo
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What is the advantage for having amniotic eggs?
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Allows a wider range of terrestrial habitats
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What is the advantage for having a functional rib cage?
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Increases efficiency and supports organs and muscles for breathing
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