Spiny-bodied Animals

Sand dollar

Brittle Star

Sea Cucumber

Sea Urchin

Starfish

1. They have five-part bodies and spines.
2. They have many tube feet with tiny suction cups.
3. There feet help them move, feel, and capture food.
4. They only live in water.
5. The body wall of these animals contains a skeleton of plates.

Arthropods

Myriapod  centipede

Arachnid spider

Crustacean hermit crab

Insect butterfly

1.  They are more complex then segmented worms.
2. They have an outer skeleton, legs that bend at joint, and body divided.
3. Each body part does a job.
4. They can feel, taste, and smell as well as organs for breathing.
5. There outer skeleton is called exoskeleton.
6. They must molt or shed.

Segmented Worms

earthworm

clamworm

leech

1. They are more complex than mollusks.
2. They have two openings.
3. They have bodies that are divided into rings, or segments.
4. Some live on land and some live on salt or fresh water.
5. They have organ systems for digesting food.

Mollusks

Snail

Squid

Octopus

1. Mollusks are soft- bodied invertebrates.
2. Some live in water and some live on land.
3. Some have shells and some do not. 
4. Most have heads and muscular foot.
5. Mollusks are very complex than sponges and all of the ones we learned.

Roundworms

roundworms

1. They have two openings.
2. They have bodies that regenerate.
3. Most roundworms are parasites.
4. You will not find roundworms outside.
5. They are more complex.

Flatworms

tapeworm

planarian

1. Flatworms can replace some of there body.
2. They have one opening end.
3. They have cells that turn in to tissues.
4. A flatworm is another underground regeneration.
5. They have no backbone.
6. Flatworms are soft and flat.

fluke

Stinging-Celled Oranisms

Jellyfish

Hydra

sea anemone

1. Invertebrates do not have backbones.
2. They have tentacle.
3. They live in water.
4. They can not leave in there place.
5. They can replace there body parts.



coral

6. They have an open mouth.

Sponges

1. Sponges are a kind of invertebrates.
2. They are different kind of shapes and sizes colors too.
3. Sponges can't move ware they want to go.
4. They eat little food in side of water.
5. If sponges get damaged it can grow back.
6. Sponges live on the sea floor.
7. It is not a plant.

pink sponges

sponges