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Class Amphibia - Class Amphibia Double life salamanders...

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Class Amphibia Double life, salamanders, frogs, toads, still tied to water for reproduction, 3,900 species - Order caudata: tailed amphibians, salamanders - Order apoda: footless amphibians, caecilians—tropical - Order anura: tailless amphibians, frogs and toads History: first tetrapods=four-footed land animals carboniferous period=age of amphibians, warm, moist climate, first insects Adaptations to life on land: respiration, senosory, locomotion, excretion (water conservation), reproduction (internal fertilization, land egg) Respiratory changes - Adults lose gills - Lungs become more important - Scales lost o Increase area exposed for respiration o Reduces weight o Increases body flexibility - Skin contains o Mucus glands—keeps skin moist o Poison glands—defense o Chromatophores—color - Circulatory streamlining and reorganization o More blood to lungs and skin o Vessels serving gills reduced o Heart improved Sensory Improvements
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- Nictating membrane= transparent lower eye lid keeps moist and clean
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