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14 Cards in this Set
- Front
- Back
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What did sarcopterygians turn into?
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tetrapods
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where did tetrapods come from
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sarcopterygians
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what are the main distinctions of tetrapods?
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-vetebrates whose ancestors made transition to terrestrial
-basically, air breathing and live on land -these are tetrapods (Tetrapoda)- "four feet" -some "four-footed" verts weren't land dwellers -include all limbed vertebrates as stegocephalians |
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what gropu are stegocephalinas structurally similar to?
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elpistostegids
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What are the characteristics of stegocephalians?
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-fully formed limbs, skull, and vertebrae that could support weight on land
-but retained full set of fish-like branchial arches supporting gills;probably aquatic |
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What are the two main groups of Tetrapoda?
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-Amphibia ("both lives")
-Amniota |
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What is the major distinction of Amphibians?
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mode of reproduction
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What is the biologic "intermdiate" between bony fishes and more derived tetrapods?
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Amphibians
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what is the connection between amphibian, bony fishes and more derived tetrapods.
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Amphibians are the biologic "intermdiate" between bony fishes and more derived tetrapods
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What are the characteristics of amphibians?
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generally lay eggs in water and have an aquatic larval stage (tadpoles)
restricted to a moist environment |
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What important about other tetrapods (than amphibians)reproduction?
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have amnioniotic egg
-extra-embryonic membranes surround and protect embryo -prevents desiccation -longer developmental period -emerge from egg more or less mini adult |
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What group is Lissamphibia a part of?
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living amphibains
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what are the characteristics of lissamphibians?
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not primitive tetrapods
-some retain ancient locomotion -but all primarily exchange gas by cutaneous respiration -some quite specialized in their own ways |
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what are the three groups of lissamphibia?
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Caudata (salamanders)
Anura (frogs) Gymnophiona (caecilians) |
