Download - Amphibia[1]
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QuickTime™ and a decompressor
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Class Amphibia
Includes caecilians, salamanders, frogs, and toads, newts
More than 5,400 species
Live in moist habitatsTransition from WATER to LAND
Many species are greatly threatened
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What about their habitat?
Found on every continent except Antarctica
Typically near waterReproduction
Eggs without shell
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A threatened groupPopulation crashes and mass extinctions
Causes?
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Starting on the outside. . .
SKINEctothermsProtection and respiration
Mucous - lubricates and protects from predators
Indicator of ecosystem health
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Frog Legs Anyone?
Powerful hind legsStrong bones and musclesAble to leap many times their body length
4 legs - tetrapods
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Frog Senses
SIGHTEyes work equally well in and out of water
Nictitating Membrane SOUND
Tympanic Membrane
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Order Anura“without a tail”
Frogs and ToadsLive in a variety of habitatsMost frogs spend part of lives in waterLarvae - tadpolesToads typically have rough bumpy skin
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Order Urodela“visible tail”
SalamandersElongated bodies, long tails, 2 prs of legsMost are found in N and S AmericaSmooth moist skinLungless salamanders - largest group
Gills, lungs, both, or none
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Order Apoda“no legs”
CaecilianLegless amphibiansMost are found in tropical areasRarely seen - little known about behavior
Nearly blind
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