Agnatha Common Name Representatives General Features “Jawless Fishes” sea lamprey, hagfish no jaws unpaired fins eel-like bodies notochord persists cartilage skeleton no scales smooth, slimy skin lamprey sucker-like mouth with teeth parasite of fish 2 chambered heart gills lamprey swims in a rippling manner external fertilization lamprey - larva, metamorphosis
Chondrichthyes “Cartilagenous Fishes” sharks, skates, rays movable jaws paired fins cartilage skeleton
Osteichthyes “Bony Fishes” salmon, trout, eel, hake, tuna, seahorse largest class! movable jaws paired fins w bony ribs bony skeleton protective, overlapping scales, lateral line various modes; typical GI tract + glands: liver, gall bladder, pancreas 2 chambered heart gills covered by operculum paired fins, side 2 side mvmt of tail + body; swim bladder (depth) external fertilization eggs + milt
Amphibia Amphibians (2 lives) frogs & toads (tailless) salamanders & newts born in water, adult lives on land (~ water); feet often webbed larva herbivorous+gills adult carnivorous+lungs thin, secretes mucus many breathe through it sensitive to pollutants frog tongue has sticky end to catch food; eyes drop down to swallow 3 chambered heart aquatic ~ gills & skin land ~ lungs & skin frogs & toads have long hind limbs for jumping external fertilization frog - amplexus tadpole metamorphosis
placoid scales (tooth-like) like sandpaper (no overlap) lateral line (pits sense mvmt) predator of fish, mollusks + lobster; triangular teeth continuously shed +replaced 2 chambered heart gills shark - streamlined body + paired fins, move by moving tail and trunk side to side shark - internal fertilization some are born alive, others lay fertilized eggs in capsule
Food Getting and Digestion Circulatory System Respiratory System Movement
Reptilia Common Name Representatives Reptiles turtles & tortoises lizards & snakes crocodiles, alligators, dinosaurs 1st fully terrestrial vertebrates...
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