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Class Amphibia Frogs, Toads, Salamanders, Newts Jaclyn Koos Key Characteristics Most have 4 limbs Partially divided heart Skin Soft, thin, & glandular Double-loop circulation Cutaneous respiration Anatomy Mouth Esophagus Stomach Gall bladder Pancreas Liver Small intestine Large intestine Cloaca Anus Lungs Kidney Ureters Urinary bladder Digestion One-way digestion Mouth Tongue grabs insects Stomach Intestines Anus Respiration Lungs Take in oxygen through skin O2 goes directly to blood stream Gills for underwater breathing Exhale CO2 waste back into the air Internal Transport Heart pumps blood to whole body 3 chambered heart Double-loop circulation Ectothermic Cutaneous (skin) respiration Excretion Kidneys Ureters Large intestine Cloaca Liquid & solid wastes leave through cloaca Response Brain Spinal cord Nerves Two simple nostril holes Eyes enable to spot moving insects Movement Legs Webbed feet Tail helps move Jumping legs Suction cups for climbing Reproduction Females lay eggs Eggs are laid in water Some hatch inside the mother Internal or external fertilization Larval stage may last from 10 days to 20+ years Examples Caecilians Toads Frogs Salamanders Newts Facts Existed for around 350 million years Frogs can leap 7.5 feet in a jump 5,453 species of frogs & toads 560 species of salamanders & newts 171 species of caeceilians Chinese Giant Salamander Literature Cited Prentice Hall Biology book http://www.shsu.edu/~bio_mlt/AMP HIBIA.html http://www.angelfire.com/mo2/ani mals1/amphibian/amphibia.html http://animals.about.com/od/amphi bians/p/amphibians.htm World Book “A”
