Octavio’s

Book

Cnidarian

Cnidarian

s

s

Cnidarians are
Invertebrates

(no backbones)

The hydras
and jellyfishes
are cnidarians

The jellyfish can
be a few inches in
width and the
largest can be
over 6 feet

Cnidarians are
aquatic

animals,

mostly marine

The anemone
and the red
coral are
cnidarians

The body of a
cnidarians is

a

sack with an
opening.

This opening
is surrounded
by many
poisonous
tentacles

The Portuguese
Man of War is
a colony of
poisonous
cnidarians

Some

cnidarians

have the

Medusa

form,

and living free

In the

medusa

form the
tentacles
dangle down

The sea
nettles
have medusa
form

Others cnidarians
have the

Polyp

form,

and living in
colonies

Polyps form is
when the
cnidarians are
connected to
the bottom

The brain coral
and the pillar
coral have the
polyps form

The coral polyps
form reefs that
can stretch for
thousand of miles

The largest coral
reef is the Great
Barrier Reef at the
northeast of
Australia

The coral reef
are the home of
an amazing
variety of animals

There are
more than

11,000

species

of Cnidarians