Phylum?Chordata 7 Classes: 1. Agnatha Jawless fish 2. Chondrichthyes Sharks, rays.
Transcript of Phylum?Chordata 7 Classes: 1. Agnatha Jawless fish 2. Chondrichthyes Sharks, rays.
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Phylum?
Chordata
7 Classes:
1. Agnatha Jawless fish
2. ChondrichthyesSharks, rays
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3. OsteichthyesBony fish
4. Amphibia
5. Reptilia
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6. AvesBirds
7. MammaliaMammals
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Amphibia
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What is an amphibian?
• A vertebrate that with some exceptions, lives in the water as a larva and on land as an adult.• Uses gills as a larva, uses lungs as an adult.• Lacks scales and claws.• Has moist skin with mucous glands.
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Theory:• First amphibians to climb onto land probably resembled lobed-finned fish similar to coelacanth.
• The transition from water to land involved havinglegs, lungs to breathe air and protecting eggs from drying out.
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Characteristics:
Feeding: Tadpoles – filter feeders or herbivoresAdults – Carnivorous
Respiration: Tadpoles – Gas exchange through skinand use of gills.Adults – Lungs
Circulation:
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Excretion: Kidneys filter wastes from blood and formurine to be excreted.
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Reproduction:
External fertilization in most species
Read on p 775 to fill in the blanks…
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Movement: Larvae – wiggling their bodies and usinga flattened tail.
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Adults: Salamanders – walk, run move with S-shaped curves.Frogs and toads – Hind limbs enable them to jump.Tree frogs – have disks on their toes that serve assuction cups for climbing.
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Response:Hearing: Through tympanic membranes (eardrums)
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Large eyes that can movearound in their sockets.Eye surface is protected bya transparent nictitating membrane. Located inside the regular eyelid. Protect eyes underwater and keep moist on land.
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http://animal.discovery.com/tv-shows/river-monsters/videos/japanese-giant-salamander.htm
http://animal.discovery.com/tv-shows/other/videos/the-vanishing-frog-a-new-species.htm