1. Cephalopods

2. Cephalopods
Tentacles grow from head, shell varies throughout the class

3. SUPPORT STRUCTURE Nautilus – light chambered shell
Squid – thin internal shell
Cuttlefish – thick bone-like structure
Octopus – no support structure

4. Cuttlefish
Squid-like, fast swimmers

5. Cuttlefish

6. Cuttlefish

7. Cuttlefish

8. Octopus Rarely swims, crawls on 8 arms
Lives in holes, crevices, and burrows
Nocturnal hunters, squirt ink as defense

9. Giant Pacific Octopus

11. Squid Very active swimmers Commonly found in schools
Aggressive predators

12. Arrow squid

13. Opalescent Squid

14. Nautilus
Slow swimmers
Can have up to 90 arms

15. Chambered Nautilus

16. CHAMBERED NAUTILUS

17. Intelligence
Octopus is the smartest known invertebrate – can learn from past experiences

18. Size
Giant squid is the largest living invertebrate – up to 50 feet long

20. In September of 2005 Japanese scientists shot the first photos ever taken of a living giant squid in its natural environment – Northern Pacific Ocean.
Measured roughly 25 feet long

22. Mouth
Located in the center of the tentacles, have a beak, venomous glands, radula

24. Ringed octopus has venom that can be fatal to humans

25. Siphon
Propels them, runs water and oxygen over gills, eliminates wastes, releases gametes, releases ink

27. Chambered nautilus
Can fill or empty their chambers with water to control buoyancy