Invertebrates are animals without backbones and make up 97% of animal species. They include single-celled and multicellular organisms like sponges, jellyfish, worms, insects and snails. Invertebrates are diverse, ranging from simple organisms lacking organs to complex animals with exoskeletons. They live in various environments including oceans, ponds and soil.

2. Invertebrates are the animals which don’t have backbone.
This simple definition hides the tremendous diversity found
within this group which includes protozoa (single-celled
animals), corals, sponges, sea urchins, starfish, sand
dollars, worms, snails, clams, spiders, crabs, and
insects.

3.  Invertebrates are eukaryotic because they contain
complex structures enclosed within membranes.
 Invertebrates are multicellular, which means that
they are organisms that contain more than one cell.
 Invertebrates don’t have cells walls because they are
all animals and animals can not have cell walls.
 Invertebrates don’t have cells walls because they are
all animals and animals can not have cell walls.

4.  97% of the animal kingdom is made up of
invertebrates.
 Some can be found in ponds, oceans, and other
water environments.
 Insects and some other invertebrates have
exoskeletons.
 An exoskeleton is a hard outer covering that
protects an animal’s body and gives it shape.

6. Porifera
Coelenterata
Platyhelmintthes
Nematoda
Annelida
Arthropoda
Mollusca
Echinodermata

7. They look like plants but
they are animals.
They have no mouth,
stomachs, or other organs.
Most live in oceans.
The cannot move.
Their bodies are full of
holes, and their skeleton is
made of spiky fibers
Water flows through the
pores of their body, aided
by flagella, which enables
them to catch food

8. They have tentacles
and mouth.
They live on the ocean
floor.
They shoot poisonous
darts.
Some live in colonies
and few in solitary.
They feed by catching
tiny animals in their
tentacles.

9. Some are found in
water or marshy soil and
some are parasitic
Acoelomates.
Triploloblastic animals.
Bilateral symmetry.

10. Live in widest
environments, some are
found in water or marshy
soil and some are
parasitic.
Commonly called round
worms.
Pseudocoel.
Triploloblastic animals.
Bilateral symmetry.

11. Live in widest
environments, some are
found in water or marshy
soil and some are
parasitic.
Commonly called
segmented worms.
Truecoelom.
Triploloblastic
animals.
Bilateral symmetry.

12. Largest phylum in the
animal kingdom.
They have jointed legs.
Haemocoel.
Triploloblastic
animals.
Bilateral symmetry.
Open circulatory
system.

13. These are soft bodied
and aquatic animals.
Soft body is covered
with a protective shell.
Triploblastic animals
and exhibit bilateral
symmetry.
They have a modified
muscular foot for
locomotion.

14. These are exclusively
marine animals.
•Spines are present all over
the body.
•Triploblastic animals and
exhibit radial symmetry.
•The inner surface of the
body bears number of
appendages called tube feet
which helps in locomotion
and exchange of gases.