1. MOLLUSCA
Vania and Rolla
Kingdom: Animalia
Phylum: Lophotrochozoa

2. Characteristics
Soft bodies
Typically only consists of head and foot part
Body often covered with hard exoskeleton
Live in terrestrial mountain tops to the hot vents and cold seeps of the deep sea
Size from 20 m long to microscopic size

3. Structure

4. Classes
MOLLUSCA

5. Class Bivalvia (Pelecypoda)
Bi = two
Valvia = valves
Bivalvia = have shells composed of two pieces of valves
The valves are used to protect themselves from danger and allowing the animals to move in water by clapping the valves together

6. Lifecycle

7. Examples
Mussels
Oysters
Scallops
Clams

8. Class Gastropoda
They have single shell or no shell
Can be found in both salt or fresh water and on land
More active and mobile than bivalves
There is a concentration of nerve cells in the tentacles and at the anterior end
In some animals, eyes are highly developed

9. Lifecycle

10. Examples
Snails
Whelks
Abalone
Slug

11. Class Cephalopoda
Considered as the most evolutionarily advanced animals to be found among the invertebrates
Has a large head, conspicuous eyes and a central mouth surrounded by arms
They have well-developed brains, resulting in highly developed sensory system and predatory behavior

12. Lifecycle

13. Examples
Octopus
Squid
Cuttlefish

14. Roles
Food source
Economic activities pearl selling, seafood marketing, shells are used for button producing
Decorative materials
Building materials shells of oyster are mixed with tar and used for road making un US

15. Sources
http://www.blurtit.com/q631046.html
www.ucmp.berkeley.edu/taxa/inverts/mollusca/mollusca.php
infusion.allconet.org/webquest/PhylumMollusca.htm