Vertebrates by

Bony Ray Finned Fish

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Scales

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Scales are bony plates in the skin

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Scales are covered by an operculum, with one gill slit

No limbs

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Fins

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Fins are supported by rays

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Swim bladder containing gas for buoyancy

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Eggs and sperm released for external fertilization

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Remain in water throughout their life cycle

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Do not maintain body temperature

Amphibians

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Soft moist skin permeable to water and gases

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Simple lungs with small folds and moist skin for gas exchange

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Tetrapods with pentadactyl limbs

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Tetrapods with pentadactyl limbs

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Four legs when adult

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Eggs and sperm released for external fertilization

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Larval stage that lives in the water and adult that lives on land

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Eggs coated in protective jelly

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Do not maintain constant body temperature

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Reptiles

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Impermeable skin covered in scales of keratin

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Lungs with extensive folding to increase surface area

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Tetrapods with pentdactyl limbs

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Four legs in most species

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Sperm passes into the female through internal fertilization

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Female lays eggs with soft shells

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Teeth all of one type (compare with mammals)

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Do not maintain constant body temperature

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Birds

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Skin with feathers made of keratin

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Lungs with para-bronchial tubes, ventilated using air sacs

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Tetrapods with pentadactyl limbs

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Two legs and two wings

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Sperm passes into the female for internal fertilization

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Female lays eggs with hard shells

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Beak but no teeth

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Maintain constant body temperature

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Mammals

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Skin has follicles with hair made of keratin

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Lungs with alveoli, ventilated using ribs and a diaphragm

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Tetrapods with pentadactyl limbs

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Four legs in most or two legs and two wings/arms

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Sperm passes into the female for internal fertilization

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Most give birth to live young and feed young with milk from mammary glands

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Teeth of different types with a living core

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Maintain constant body temperature

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