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Published byBartholomew Paul Modified over 8 years ago
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Phylum Chordata
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Invertebrate Chordates Ex. Tunicates/Sea Squirts Ex. Lancelet
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Fishes Ectotherms (cold-blooded) Lay eggs without a shell External fertilization
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Jawless Fish Cartilage skeleton; no jaws Ex. Lamprey, hagfish
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Cartilage Fish Jaws and cartilage skeletons Ex. Sharks, rays and skates
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Bony Fish Have jaws and a bony skeleton Have a swim bladder that allows them to float at different depths Most fish are in this group—perch, eel, trout
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Amphibians Ectothermic, external fertilization, eggs have no shell Ex. Toads, (thick bumpy skin with poison glands) frogs, newts and salamanders
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Reptiles Ectothermic, eggs with a shell, internal fertilization 3 chambered heart (except crocodiles have 4) Amniotic Egg
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Birds Endothermic (warm-blooded), internal fertilization, amniotic eggs Build nests to incubate eggs Air sacs to increase O2
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Mammals Endothermic, mammary glands, hair, sweat glands, 4 chambered heart, diaphragm Divided into 3 groups based on how they reproduce
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Monotremes: lay eggs, ex. Platypus, echidna
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Marsupials: carry immature young in a pouch, ex. Kangaroo, opossum
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Placentals: carry young in uterus— includes most mammals.
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