1. Invertebrates Sponges Cnidarians Flatworms Roundworms Segmented Worms
Mollusks
Arthropods
Echinoderms

2. General Info Animals without a backbone
Make up ~97% of all animal species
There are 30 phylum, we’ll talk about 8

3. Sponges

4. Sponges Belong to the Porifera phylum The simplest animal
10,000 species

5. Sponges live in the water Strain food through their bodies
they produce egg and sperm so they are neither male or female
they regenerate which means a new sponge will grow back when a piece is broken off

6. Cnidarians

7. Cnidarians Jellyfish, corals , and hydras
They are sessiles ; they stay in 1 spot!
10,000 species

8. Cnidarians body is like a wheel
tentacles with stinging cells to capture prey

9. FLATWORMS Flat and thin Parasites live on or in other organisms
(ex) tapeworm

10. FLATWORMS

11. Roundworms Long round bodies with a point at the end
Live in soil or water
Some are parasites
Hookworm

12. Roundworms

13. SEGMENTED WORMS Have many sections (segments)
Live in Soil freshwater, or the ocean
Most familiar worms
(ex) leeches and earthworms

14. SEGMENTED WORMS

15. Mollusks Body divided into 3 parts H ead B ody F oot
There are over 112,000 species of mollusks

16. Mollusks Snails and slugs are the largest group of mollusks
Snails have a hard shell
Slugs do not have a shell

17. Mollusks

18. Mollusks 2. Clams, Scallops and oysters are also a group
They have hinged shells that open and close

19. Mollusks 3. Squids and octopus have no outer shells
They can swim fast to catch their prey

20. ARTHROPODS Jointed legs most have antennae body with external skeleton
Arthropods are the largest group of INVERTEBRATES
ALL arthropods have 3 things in common
Jointed legs
most have antennae
body with external skeleton

21. ARTHROPODS They make up ¾ of all animals
There are different groups of arthropods

22. ARTHROPODS
Crustaceans: crabs, lobsters and crayfish

23. ARTHROPODS
Arachnids: spiders scorpions, ticks and mites

24. ARTHROPODS
Centipedes
Millipedes

25. ARTHROPODS
Insects : mosquitoes, flies , ants, beetles

26. ECHINODERMS Have radial symmetry
Sea stars (starfish ), sea urchins, sand dollars and sea cucumbers

27. ECHINODERMS Have tube feet which can attach firmly to surfaces
Tube feet allow them to move about