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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

AMPHIBIANS

Ms. Bridgeland

5th Grade



Amphibians one of the 5 classes of vertebrates reminder what are the other 4 classes of vertebrates
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
Why do you think the word “Amphibian” means “double-life?”


Amphibian 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



2 major groups of amphibians
2 Major Groups of Amphibians

  • Salamanders:

  • Frogs/Toads:


How can you tell the difference between salamanders and 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



Frogs toads
Frogs Toads


Frogs
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
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
Amphibian Reproduction

  • For all amphibians, Fertilized eggs develop in water



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



How amphibians reproduce
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 1: Adult frogs lay eggs in water


Stage 2 fertilized eggs
Stage 2: Fertilized Eggs

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


Stage 3 larvae
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 _________



Metamorphosis
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 4: Larvae develops hind legs


Stage 5 front legs develop but frog still has tail
Stage 5: Front legs develop but frog still has tail


Stage 6 frog loses tail and becomes a mature adult
Stage 6: Frog loses tail and becomes a mature adult



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