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Invertebrates - Animals Without Backbones
Science, Grade 4
❮
1
/
2
❯
sand
dollar
starfish
clam
foot
hard
shell
earthworm
dragonfly
flat
worm
lobster
spider
hydra
tentacle
bud
-
new
hydra
Scientists
classify
animals
into
two
major
groups,
vertebrates
and
invertebrates.
Invertebrates
are
animals
that
do
not
have
a
backbone.
Many
invertebrates
do
not
have
hard
body
parts
either,
though
some
do.
There
are
many
different
invertebrates
living
on
Earth.
In
fact,
most
of
the
organisms
living
on
Earth
are
invertebrates.
Scientists
classify
invertebrates
into
broad
groups
called
phyla,
based
on
their
symmetry
and
body
plan.
The
major
groups
of
invertebrates
are
cnidarians,
echinoderms,
mollusks,
worms,
sponges,
and
arthropods.
Jellyfish
(a
cnidarian)
have
soft
bodies
and
long
stinging
tentacles
that
are
poisonous.
Sea
anemones
look
like
flowers
in
the
sea
and
live
attached
to
objects
on
the
ocean
floor.
Coral
reefs
are
a
mass
or
ridge
of
living
coral
that
need
sunshine
and
warm
waters
to
survive.
Coral
reefs
live
in
warm,
shallow
sea
waters.
Coral
reefs
provide
a
protective
living
environment
for
a
large
variety
of
invertebrate
marine
life.
Crustaceans
are
arthropods
and
include
crabs
and
lobsters.
They
have
hard
external
shells
that
protect
their
soft
bodies.
They
show
bilateral
body
symmetry.
nautilus
-
mollusk
jellyfish
fly
shrimp
-
crustacean
octopus-
mollusk
Cnidarians
include
hydra,
jellyfish,
and
sea
anemones.
All
cnidarians
have
stinging
cells
which
they
use
to
catch
food.
Arthropods
are
the
largest
animal
phylum.
Arthropods’
skeletons
are
on
the
outside
of
their
bodies.
All
arthropods
have
segmented
bodies
and
jointed
legs.
Insects,
crabs,
centipedes,
millipedes,
and
spiders
are
all
examples
of
arthropods.
Worms
are
invertebrates
that
have
long,
soft
bodies
and
no
legs.
Roundworms,
such
as
earthworms,
have
segmented
bodies
which
mean
their
bodies
are
divided
into
sections.
Flatworms,
such
as
tapeworms,
have
flat
simpler
bodies.
Mollusks
have
soft
bodies
and
most
have
shells.
Snails,
clams,
and
octopus
are
types
of
mollusks.
Mollusks
move
by
using
a
structure
called
a
foot.
Its
foot
produces
slime
that
helps
them
move
easier
along
the
ground.
Echinoderms
are
invertebrates
that
live
in
the
ocean.
Examples
include
starfish,
sea
urchins,
sand
dollars,
and
sea
cucumbers.
Echinoderms
show
radial
symmetry.
Invertebrates
-
Animals
without
Backbones
© Copyright NewPath Learning. All Rights Reserved. 94-4402
www.newpathlearning.com
Animal
Kingdom
Invertebrates
Phylum
•
Cnidarians
•
Arthropods
•
Worms
•
Mollusks
•
Echinoderms
•
Porifera
Describe
the
following:
Cnidarians
________________________________________________
__________________________________________________________
Arthropods
_______________________________________________
__________________________________________________________
Roundworms
______________________________________________
__________________________________________________________
Flatworms
________________________________________________
__________________________________________________________
Mollusks
_________________________________________________
__________________________________________________________
Echinoderms
______________________________________________
__________________________________________________________
Crustaceans
_______________________________________________
__________________________________________________________
What
are
invertebrate
animals?
_____________________________________
_________________________________________________________________
_________________________________________________________________
How
are
invertebrate
animals
classified?
______________________________
_________________________________________________________________
_________________________________________________________________
What
is
a
Coral
reef?
_________________________________
___________________________________________________
___________________________________________________
Key
Vocabulary
Terms
•
anemone
•
mollusk
•
arthropod
•
nautilus
•
classify
•
octopus
•
cnidarian
•
roundworm
•
crustacean
•
shrimp
•
echinoderm
•
spider
•
flatworm
•
sponge
•
insect
•
starfish
•
invertebrate
•
symmetry
•
jellyfish
•
tentacles
Animal
Kingdom
Invertebrates
Phylum
•
Cnidarians
•
Arthropods
•
Worms
•
Mollusks
•
Echinoderms
•
Porifera
Invertebrates
-
Animals
without
Backbones
© Copyright NewPath Learning. All Rights Reserved. 94-4402
www.newpathlearning.com
\|xiBAHBDy01719mzV
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