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Published byKathlyn French Modified over 9 years ago
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AMPHIBIANS Amphibian means “double life”
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CLASSIFICATION Eukaryote Domain Animal Kingdom Phylum Chordata (vertebrates) CLASS: FISH, AMPHIBIANS, REPTILES, MAMMALS, BIRDS
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Life on water and land Larvae live in water (aquatic) Respiration with gills and skin Adults live on land (terrestrial) Respiration with lungs and skin
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I. Characteristics 1. Vertebrate (backbone) 2. Lives in water and on land 3. Moist skin 4. Lack scales and claws 5. Ectothermic (cold – blooded)
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II. Evolution Evolved in the swampy tropical ecosystems of the Devonian Period (1 st @ 360mya). Next: The “Age of Amphibians” was the Carboniferous Period (360 to 290 mya). Many species appeared and ruled the land!
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Amphibian Groups Frogs and Toads Order Urodela – they jump Salamanders Order Anura – long bodies Caecilians Order Apoda – legless, long bodies
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III. The Amphibian Body: A. Respiratory system tadpole - gills and skin adults – lungs and skin B. Circulatory system 1. double loop: body to heart, lungs to heart 2. 3 chambered heart 2 atria, 1 ventricle
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C. Feeding FROGS and TOADS Herbivores as tadpoles Carnivores as adults Eat anything they can catch! SALAMANDERS carnivores
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Digestive system Mouth Pharynx Esophagus Stomach Small intestine* * liver and pancreas produce digestive juices Large intestine (colon) Cloaca –One opening for the removal of waste, urine, eggs and sperm.
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REPRODUCTION Courtship dances (salamanders) Courtship calls (frogs/toads) Male and female find each other with frog songs. Each species has identifying “songs” External fertilization Egg layers – eggs must be laid in water/or moist environment
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Egg Incubation/Parent Behavior Most species abandon eggs (frogs lay @ 200) Some species take great care of eggs and young. Some species carry incubating eggs on their back, in their mouth, in their stomach Ex. male midwife toad
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Adaptations for Movement EXAMPLES Frogs and toads - large hind legs for jumping - suction cups on feet salamanders - body takes S shape and springs forward
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