1. Introducing Invertebrates
Kingdom Animalia
Introducing Invertebrates

2. What are the characteristics of invertebrates?
Invertebrates are animals that do not have backbones.
There are 8 phyla of invertebrates.
Invertebrates live all over the world. Some live in the ocean. Others live in lakes and streams.
Many live on land and some may live in you.
What are the characteristics of invertebrates?

3. Sponges Sponges live in the ocean
They are attached to the bottom and cannot move around.
They have sac-like bodies with their mouth at the top.
Sponges

4. Most cnidarians live in the ocean but some live in fresh water.
They have tentacles with stinging cells to catch their prey.
Their mouth is in the middle of the tentacles.
Examples are jellyfish and sea anemone.
Cnidarians

5. Flatworms Flatworms live in water, too.
They have long, flat, ribbon-like bodies.
Some are free living while others are parasites.
A parasite is an organism that lives inside another organism.
Examples are a planarian and a tapeworm.
Flatworms

6. Roundworms Most roundworms are parasitic.
They get their food from living inside another organism and eating its food or tissues.
Examples are hookworms and heart worms.
Roundworms

7. Segmented worms have long tube-like bodies that is divided into segments (sections).
They have a simple brain and 5 hearts.
Most live in the ground.
Examples are earthworms and leeches.
Segmented Worms

8. Mollusks Mollusks have soft bodies but many have shells.
Most live in the ocean but some live in freshwater and on land.
Examples are the snail, clam, octopus and squid
Mollusks

9. Echinoderms Echinoderm means spiny skin. All live in the ocean.
They have an internal skeleton made of the spines.
Examples are sea stars and feather stars.
Echinoderms

10. Arthropods Arthropod means jointed feet.
They all have a hard outer covering called an exoskeleton.
They have segmented bodies.
Live on land and in the water.
Examples are spiders, grasshoppers and butterflies.
Arthropods