Octavio’s Book
CnidariansCnidarians
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 redcoral 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