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14 Cards in this Set

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  • Back
What did sarcopterygians turn into?
tetrapods
where did tetrapods come from
sarcopterygians
what are the main distinctions of tetrapods?
-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
what gropu are stegocephalinas structurally similar to?
elpistostegids
What are the characteristics of stegocephalians?
-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
What are the two main groups of Tetrapoda?
-Amphibia ("both lives")
-Amniota
What is the major distinction of Amphibians?
mode of reproduction
What is the biologic "intermdiate" between bony fishes and more derived tetrapods?
Amphibians
what is the connection between amphibian, bony fishes and more derived tetrapods.
Amphibians are the biologic "intermdiate" between bony fishes and more derived tetrapods
What are the characteristics of amphibians?
generally lay eggs in water and have an aquatic larval stage (tadpoles)
restricted to a moist environment
What important about other tetrapods (than amphibians)reproduction?
have amnioniotic egg
-extra-embryonic membranes surround and protect embryo
-prevents desiccation
-longer developmental period
-emerge from egg more or less mini adult
What group is Lissamphibia a part of?
living amphibains
what are the characteristics of lissamphibians?
not primitive tetrapods
-some retain ancient locomotion
-but all primarily exchange gas by cutaneous respiration
-some quite specialized in their own ways
what are the three groups of lissamphibia?
Caudata (salamanders)
Anura (frogs)
Gymnophiona (caecilians)