Amphibians
description
Transcript of Amphibians
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Amphibians
7th Grade Life science
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Amphibian Characteristics
• From greek amphibios = double life• Ectotherms --Hibernation & Estivation• Moist smooth skin• 3 chambered heart as adults
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Chordate Phylum
Animal kingdom
Subphylum Vertebrata
ClassAmphibians
Order = Caecillians
Order = Caudata(salamanders)
Order = AnuraFrogs and Toads
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Caecillians
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Salamanders
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Frogs and Toads
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Frog Life Cycle
MetamorphosisMeta = change / Morph = shape
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Differences between Frogs and Toads
FrogsHighly permeable skin that generally needs to
stay very moist.
Toads• Have thicker skin and are better adapted to
life away from water.
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American Toad
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Frog Skeleton
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Frog Anatomy
Tympanic Membrane
Nictitating Membrane
Dark Camouflaged Back
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External Anatomy
• Nictitating membrane--clear eyelid • Tympanic Membrane-- separates the outer
environment from the inner ear.• Dark camouflage coloration
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Mouth Anatomy
Tongue
Maxillary Teeth
GulletMandible
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Digestive Tract• Mouth --> Pharynx --> Stomach --> Small Intestine -->
Large Intestine --Cloaca
• Small Intestine--nutrient absorption and digestion• Large Intestine--digests bacteria, reabsorbs water
and forms feces• Liver--produces bile for digestion• Gall Bladder--stores liver bile
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Ventral Anatomy
Gall Bladder
Small Intestine
Liver
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Frog Stomach
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Ventral Frog View
Small Intestine
Liver
Fat Bodies
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Frog Dorsal Cut
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Circulatory System• 3 chambered heart (left/right atrium; ventricle)• Veins = Oxygen poor blood
Artery = Oxygen rich blood Right Atrium
Left Atrium
Ventricle