Transcript Classifying Animals

Classifying
Animals
Chapter 1 Lesson 3
What are simple
invertebrates
 Animals
that do
not have a
backbone
 They can live on
land and in the
water
Sponges
They do not have
true organizations
 They are the only
animals without real
tissues or organs
 They are members
of the phylum
Porifera. All
members of this
phylume live in
water

Cnidarians
 Jellyfish,
sea
anemones, corals,
and hydras
 Soft-bodied,
aquatic creatures
 Radial symmetry,
tentacles, muscle
tissues, stinger cells,
and a mouth
Worms
 Three
main worms:
flatworms,
roundworms, and
segmented worms
 Have bilateral
symmetry
What are complex
invertebrates?
Mollusks




Have muscular foot or
tentacles, a fold of tissue,
and a mass of internal
organs
Squids, snails, clams,
octopus
Almost all have a shell
Gills for breathing, heart,
and well-developed
nervous system
Echinoderms
 Sea stars, sea urchins,
sea cucumbers
 Have a skeleton
located inside the
body called
endoskeleton.
 Have many tube feet
that cling like suction
cups
Arthropods
 Most
numerous animal group of Earth with
more than half of the world’s animal
species included
 Spiders, crabs, and insects
 They are small and light with a hard
skeleton on the outside of the body
called an exoskeleton. This provides
strength and protection
Arthropod
Echinoderm
Mollusks
What are vertebrates?
Fish
 Fish
are coldblooded
 Fish have gills that
allow them to
breathe under
water
 There are 3 classes
of fish: jawless,
cartilaginous fish,
and bony fish
Amphibians




Frogs, toads, and
salamanders
Cold-blooded
They bridge the gap
between land and water
vertebrates because
they spend part of their
lives in the water and
part on land (frogs)
They have gills but
develop into lungs
Reptiles
 True
land animals with
one or two lungs
 Thick, scaly,
waterproof skin
 Lizards, snakes, turtles,
alligators, and
crocodiles
 Cold-blooded. They
stay warm by sunning
themselves
Birds
 Have
two legs, and
two wings
 FEATHERS- these are
specific to birds
 Feathers keep heat
inside the birds’
bodies
 Birds are warmblooded and maintain
a constant
temperature
Mammals
 Milk,
hair, and large
brains are key
characteristics
 They produce milk to
feed their young
 All mammals have
hair or fur
 Mammals are warmblooded




Monotremes are
mammals that lay eggs:
duck-billed platypus &
anteater
Marsupials are pouched
mammals that give birth
to partially developed
offspring: kangaroos and
koala bears
Placental mammals
develop within its mother
Whales, dolphins,
humans, dogs, elephants,
tigers