1. Phylum: Mollusca
Class: Polyplacophora
Class: Bivalvia
Class: Gastropoda
Class: Cephalopoda

2. Scallop
Class: Bivalvia

3. Gastropod

4. Class: Polyplacophora
Chiton
Class: Polyplacophora

5. Cuttlefish
Class: Cephalopod

6. Class: Gastropoda

7. Class: Bivalvia

8. Land slug
Class: Gastropoda

9. Gastropod

10. Cephalopod

11. Nautilis
Class: Cephalopoda

12. Class: Bivalvia
Zebra Mussel

14. Food for thought

15. What Phylum have all of these animals been in?

16. GENERAL CHARACTERISTICS
Lifestyle- Variety, bottom feeders, borers, burrowers, parasites, predators
Economics- food, pearls, gardeners, hosts, sewers, predators, cleaning

18. Bilateral symmetry
Unsegmented, but has a definite head
(cephalization)
Locomotion- muscular foot
Nervous system- Nerve cords, sensory
nerve endings that sense touch, smell,
taste, equilibrium, vision in some, and
ganglia

19. body surface and gills or lungs
Respiration- O2/CO2 exchange through
body surface and gills or lungs
Circulatory system
Open system in most
Closed system in cephalopods
Digestion - complex and specialized in
different molluscs
- True coelom
- Radula a hard tongue

20. Excretion- Specialized system with a
pair of kidneys for
osmoregulation
Reproduction- Most are dioecious,
some are hermaphroditic
or monecious

21. Characteristics Class: Bivalvia two shells
Examples
Mussels
Clams
Scallops
Oysters
Shipworms

22. Bivalvia (continued)
Filter feeders (*no radula*)
No cephalization
Reproduction- dioecious with external
fertilization
Development- 3 larval stages
trochophore larva spat

23. Bivalvia
Shells divided into two parts. 
Gills are used for feeding and gas exchange.
Example: 
Clams, oysters

24. Spawning clam

25. Ex-current siphon

26. Incurrent siphon of giant clam

27. Bivalvia (continued)
Respiration- gills in mantle
Nervous system- 3 pair of ganglia with
2 pair of nerve cords
Sense organs- chemoreceptors
statocysts in foot
(balance)

28. Characteristics Class: Gastropoda----Large foot
Examples
Snails
Limpets
Slugs
Welks
Conchs
Sea slugs

29. Class: Gastropoda
Largest and most diverse class of
mollusca 2nd largest class overall
40,000 living species 15,000 fossils
Most have shells
most are bilateral/torsion causes
asymmetry

30. Class: Gastropoda
Mostly herbivours, some scavengers
living on the dead and some carnivours
Digestion- enzymes, extracellular and
intracellular
(chemical / mechanical)
Respiration- By gills in the mantle
Terrestrial has lungs

31. Class: Gastropoda
Nervous system- 3 pairs of ganglia
Reproduction- Dioecious
Monecious, but self
fertilization rarely occurs
Sense organs- Tentacles on head which
may have eyes
Statocysts in foot

32. Characteristics Class: Cephalopoda Head foot
Examples
Squid
Octopus
Nautiluses
Cuttlefish

33. Class: Cephalopoda
Most complex class
*Most advanced invertebrate brain*
All are predators
All are marine
2cm-30cm normal / Giant squid 18m
Ink production for protection
Chromatophores pigment cells in skin
controlled by nervous system and
hormones allow cephalopods to change
colors

34. Class: Cephalopoda Locomotion-expelling water from mantle
Reproduction- dioecious
internal fertilization
Circulatory system- Closed with
capillaries to organs
Respiration- Gills

35. Class: Cephalopoda Nervous system- Central with large brain
Nerves with ganglia
and buccal ring
Sense organs
Eyes
Statocysts
chemoreceptors

36. Cladogram phylum Mollusca
Cephalopoda
Bivalvia
Gastropoda
Polyplacophora
Mollusca