Sponge is the simplest kind
of an invertebrate.
Shaped like a sack with an
opening at the top
It’s body is made of 2 cell
Body is hollow inside
Live in water
Adults stay in one place, their
kids float around
Mollusks are an invertebrate that has a soft body and a
Most live in water, snails and slugs live on land
Some stay in one place, others float.
Shells are sometimes inside their bodies.
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
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,
1 pair of antennae
3 pairs of legs
1-2 pairs of wings
3 body sections
4-5 pairs of legs
2 body sections
Centipedes have 1 pair of legs on each body
Millipedes have 2 pair of legs on each body
2 pair of antennae
2-3 body sections
They can chew
Flat bodies, head and a tail
Most are harmless
Some live inside the bodies of other animals
Thin bodies with pointed ends
One way digestion system
Most roundworms live inside the bodies of other
Bodies have 3 layers and divided into segments
Have a head and tail- both have an opening to the
Only live on land- none live inside an animal’s body
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