2. Sponges
Sponge is the simplest kind of an invertebrate.
Shaped like a sack with an opening at the top
Its body is made of 2 cell layers
Body is hollow inside
Live in water
Adults stay in one place, their kids float around
3. Mollusks
Mollusks are an invertebrate that has a soft body and a shell
Most live in water, snails and slugs live on land
Some stay in one place, others float.
Shells are sometimes inside their bodies.
4. Cnidarian
A cnidarians (nye-DAYR-ee-uhn) is an animal with arm like parts
called tentacles.
Sting their prey with stinging tentacles
Some stay in one place, others float around
5. arthropods
Arthropods have jointed legs and a body that is divided into
sections.
Largest group of invertebrate
Have exoskeleton, hard cover protects the body
4 major groups: insects, arachnids, crustaceans,
centipedes/millipedes
6. insects
1 pair of antennae
3 pairs of legs
1-2 pairs of wings
3 body sections
7. arachnids
4-5 pairs of legs
2 body sections
fangs
8. centipedes/millipedes
Centipedes have 1 pair of legs on each body section
Millipedes have 2 pair of legs on each body section
9. crustaceans
2 pair of antennae
2-3 body sections
They can chew
10. flatworm
Flat bodies, head and a tail
Most are harmless
Some live inside the bodies of other animals
11. roundworms
Thin bodies with pointed ends
One way digestion system
Most roundworms live inside the bodies of other animals
12. Segmented worms
Bodies have 3 layers and divided into segments
Have a head and tail- both have an opening to the digestion
system
Only live on land- none live inside an animals body
