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Amphibians

Chordata Project Presentation
by

Grace H

on 6 February 2016

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Transcript of Amphibians

Life History
Metamorphosis of amphibians:
Hatch from an egg into tadpoles
Look like tiny fish with long tails and breathe with gills
Legs begin to shrink and legs form
Gills are covered when lungs form
Adult form looks different from tadpole
compacted with four legs and no tails
Morphology
Stages:
Embryonic stage
Larval stage
Adult stage
Characteristics of Amphibians
Cold-blooded
Vertebrate
Spends part of its life in the water and part on land.
Lives in damp places where its skin won’t dry out

Kinds of Amphibians
More than 6500 existing types of amphibians
Three orders:
Anura (true frogs, tree frogs, toads)
Urodela (tailed, salamanders)
Apoda (blind and limbless)
Amphibians
Evolutionary History of the Andrias

350 million years ago
First animals to go from gills to lungs
Maybe the first animals to have four legs
During the on and off dry periods
They needed to cross land to get from one body of water to another
The earliest amphibians
much larger - up to 15 feet in length
Largest dominant animals on land
Amphibian (Greek meaning):
"amphi" - both
"bios" - life
Amphibians live both a life
in water and a life on land.
Embryonic Stage
Inside the egg, the embryo is enclosed in a semipermeable, gelatinous capsule
The capsule allows water to diffuse into the egg.
capsule is dissolved when the embryo hatches
Salamanders develop limbs in egg

Larval Stage
The larva is a morphologically distinct stage from the embryo and the adult
the larva is a free-living embryo, it must find food while avoiding predators
Salamander larvae are carnivorous and are like adult small adult salamanders with gills
Adult Stage
Only adults are able to live out of water
The skin is one of the frog's most fascinating adaptations.
Varying Skeletons
Salamanders-cartilage
Frogs- Bone
Different uses for eyes
Precise vision
night vision
Examples of Amphibians
Tiger Salamander
Blue-tailed Fire-bellied Newt
Green-and-black Poison Dart Frog
Giant Marine Toad
Mountain Chicken (yes, it’s an amphibian)
Sagalla Caecilian
Surinam Toad
Vietnamese Moss Frog

Overall...
cold-blooded semiaquatic animals
undergo complete metamorphosis,
changing from a fully aquatic tadpole to an adult that lives on land
once some of the first animals to develop lungs from gills and live on land
up to approximately 15 feet long
were the largest dominant animals on land about 350 million years ago
Today,
there are more than 6500 types of amphibians
divided into three major orders, Anura, Urodela, and Apoda
By Jake, Grace, and Giuseppe
Full transcript