4. History
So what would these lobe-finned fish do
when the ponds dried up? (think about
the lung fish)
5. History
They would use their strong lobe-fins to
move to another pond or wet area.
Now they can move from pond to pond,
and they also have a lung like organ that
can take oxygen out of the air.
13. Amphibians
Gymnophiona: Caecilians
(naked snakes) 170 species only in tropics
Caudata: Newts and salamanders
350 species
Anura: Frogs and Toads
3,500 species
14.
15. Characteristics
Amphibians are characterized by.......
1. Naked skin (no scales)
2. Three chambered heart
3. Usually a larval stage that is distinct
from the adult stage of development.
4. Cold-blooded
5. Moist skin
6. Semi-Permeable skin through which
Semi-P
they exchange most of their gases
16. Amphibians
Amphibians also
have glands in their
skin that produces
toxic substances.
Some toxics can be
deadly to predators
and humans.
17. This is Zetek’s frog,
another highly
endangered species.
Some have more yellow
and orange than this
one. Why do some frogs
have bright color
pattern?
Aposomatic Coloration
(warning colors).
18. Amphibians
Amphibians have never been able to
completely leave the water (or at least
moist environments).
1. They must return to the water to breed
2. They have to keep their skin moist.
19. Tongues
Tongues of amphibian vary considerably.
Some amphibian have no tongues.
Ex. Caecilians
20.
21.
22. Tongues
Tongues of amphibian vary considerably.
Some amphibian have no tongues.
Ex. Caecilians
Some amphibians have a very long
tongue with sticky tips.
Ex. Most toads
23.
24.
25.
26. Tongues
Tongues of amphibian vary considerably.
Some amphibian have no tongues.
Ex. Caecilians
Some amphibians have a very long
tongue with sticky tips.
Ex. Most toads
Amphibian tongues in between
30. Feeding
Amphibians catch prey by using?
Their tongue
Mouth
Once in there mouth, amphibians crush
their prey with their jaws and swallow it
whole.
Amphibians do not have teeth
31. Feeding
How do amphibians push the food down
their throat?
Amphibians use their eyes to push the
food down their throat.
32. What is Food
Amphibians will eat;
Insects
Spiders
Fish
Other frogs
Small mammals
Overall, amphibians will eat anything
they can fit into their mouth.
33.
34.
35.
36. Where They Live
Amphibians are mostly found?
Wetlands, swamps, or in moist areas.
37.
38.
39. Where They Live
Amphibians are mostly found?
Wetlands, swamps, or in moist areas.
Why do amphibians have to stay moist?
If their skin dries up they will die.
40. Skin
Amphibians skin is considered to be
semi-permeable.
Semi-permeable means liquids and
gases can pass through their skin, but
not solids.
If amphibians are in a dry environment,
there is nothing to stop water from
moving out of their body.
41.
42. Skin
But what happens when they are in water
that has toxic chemicals in it?
The toxins get absorbed into their body
with the water and they die.
Amphibians are considered to be
Bio-Indicators
43. Bio-Indicators
Bio-Indicator – is an organism that
indicates whether or not an area is
healthy.
Amphibians are widely used to figure out
how healthy wetlands are.
Example: If a pond has lots of frogs, you
would know the water is clean and free of
toxins.
44. Reproduction Methods
Oviparous – egg layers
Viviparous – live birth
Ovoviviparous – eggs hatch in side
mother and the young live in her until
maturity.