Amphibians
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AMPHIBIANS. Ms. Bridgeland 5 th Grade. Are Amphibians a CLASS or a PHYLYM?. Amphibians : one of the 5 classes of Vertebrates Reminder: What are the other 4 classes of Vertebrates?. Objective : Describe amphibian characteristics and examine how adult amphibians are adapted for life on land. .

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AMPHIBIANS

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AMPHIBIANS

Ms. Bridgeland

5th Grade


Are Amphibians a CLASS or a PHYLYM?


Amphibians: one of the 5 classes of VertebratesReminder: What are the other 4 classes of Vertebrates?


  • Objective: Describe amphibian characteristics and examine how adult amphibians are adapted for life on land.


Why do you think the word “Amphibian” means “double-life?”


Amphibian: “Double – life”

  • They begin their lives in water and spend their adulthood on land

  • To reproduce (have babies), they return to water


What are the two major groups of amphibians?


2 Major Groups of Amphibians

  • Salamanders:

  • Frogs/Toads:


How can you tell the difference between salamanders and frogs/toads?

  • Salamanders have a tail even when they are adults

  • Frog/toads lose their tails before they become adults


“What are the differences between FROGS and TOADS?”


Frogs Toads


FROGS:

  • Need to live near water

  • Have 2 bulging eyes

  • Strong, long, webbed hind feet that are adapted for leaping and swimming

  • Strong and slimy skin (like very moist environments)

  • Will take long jumps

  • Like to lay eggs in clusters

  • Found on every continent except Antarctica

  • More than 400 species

  • Have a lot of PREDATORS


TOADS

  • Can live further away from water

  • Lower, football-shaped eyes

  • Stubby bodies with short hind legs (for walking instead of hopping)

  • Warty and drier skin

  • Lay eggs in long chains

  • Will run or take small hops

  • Can be found worldwide except for Madagascar, the polar regions, and Polynesia

  • More than 300 species

  • Do NOT have a lot of predators


Amphibian Reproduction

  • For all amphibians, Fertilized eggs develop in water


What is unique/special about Amphibian eggs?


What is special about amphibian eggs is that they have a protective jelly that coats the egg instead of a shell


Amphibian Eggs


How Amphibians Reproduce

There are 6 stages in the life cycle of an Amphibian: Here is what a frog looks like in some of the stages


Stage 1: Adult frogs lay eggs in water


Stage 2: Fertilized Eggs

  • Male frogs fertilize the eggs, which lie in water for a few days


Stage 3: Larvae

  • After a few days, larvae wriggle out of a jelly that coats the egg and begin a free-swimming, fishlike life

  • Larvae of a frog or toad is called a _________


  • As they grow, larvae undergo a ______________________?


Metamorphosis

  • A process where an animal develops after birth or hatching, involving a sudden change in the animal’s structure


Stage 4: Larvae develops hind legs


Stage 5: Front legs develop but frog still has tail


Stage 6: Frog loses tail and becomes a mature adult


Metamorphosis Cycle


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