vertebrates: part i fishes & amphibians. phylum chordata chordates: includes all the vertebrates...
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Vertebrates: Part I
Fishes & Amphibians
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Phylum Chordata Chordates: includes all the vertebrates Have 3 common characteristics:
– Nerve Cord: hollow tube that hold nervous tissue
– Notochord: rod that runs down the back for support (in higher vertebrates it is replaced with the vertebral column)
– Throat with gill slits: used for breathing (in higher vertebrates these turn into the trachea)
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Phylum Chordata There are 5 groups in the phylum
Chordata we will study– 3 groups are cold blooded: no internal
temp regulation. They take on the temp of their surroundings
– 2 groups are warmblooded: maintain a constant body temp
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Phylum ChordataThe 5 Groups:
–Fish: cold blooded
–Amphibians: cold blooded
–Birds: warm blooded
–Reptiles: cold blooded
–Mammals: warm blooded
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FishesLive in freshwater or
saltwaterBone or cartilage protects
brain & spinal cordGills for respirationMostly external fertilization
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Fishes 3 Characteristics:
– Scales
– Fins
– Throat with gill slits Closed Circulatory System Well developed nervous system Keen sense of smell and taste
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Classes of FishesJawless Fish
–Lamprey, HagfishCartilaginous Fish
–Sharks, rays, and SkatesBony Fish
–Most common fish
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Jawless FishHave no bone,
only cartilageFlexibleUse teeth and
their tongue to eat
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Cartilaginous FishNo bones, only
cartilageToothlike scalesSharks can
have 1000’s of teeth in up to 20 rows
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Cartilaginous FishSkates and
Rays use poison or electric volts to stun their prey
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Bony Fish
Have bony skeleton
Most common type of fish
Many different species
Have paired fins
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Bony FishSwim in SchoolsSwim Bladders:
gas filled sac that gives fish buoyancy
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Fish Structure
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Amphibians (Amphi- double)Cold BloodedMost have metamorphosisBreathe with gills when
immature and lungs and skin when they are adult
Use both internal and external fertilization
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WHY THEY LIVE ON LAND AND WATERDrying out: skin needs to be
moist to breatheRespiration: use gills as a
babyReproduction: eggs don’t
have hard shell
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AMPHIBIANS
2 Groups–frogs, toads
–salamanders, newts
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FROGS AND TOADS Hibernate during winter Skin:
– Frogs: smooth and moist– Toads: warty and dry
Large hind legs for jumping: helps them to escape predators
Lay their eggs in water
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Frog Life Cycle
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SALAMANDER & NEWTS
VERY SIMILIAR TO FROGS EXCEPT:– No large back legs: cant jump– Do not hibernate
Lay their eggs in water
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SALAMANDERS & NEWTS
Clawless Have short smooth moist bodies Long tail. They do not have scales.