MOLLUSCAVania and Rolla

Kingdom: AnimaliaPhylum: Lophotrochozoa

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

Structure

Classes

MOLLUSCA

Class Bivalvia (Pelecypoda)

• Bi = two Valvia = valvesBivalvia = 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

Lifecycle

Examples

Mussels

Scallops

Oysters

Clams

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

Lifecycle

Examples

Snails Whelks

Abalone Slug

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

Lifecycle

Examples

Octopus Squid

Cuttlefish

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

Sources

• http://www.blurtit.com/q631046.html• www.ucmp.berkeley.edu/taxa/inverts/

mollusca/mollusca.php• infusion.allconet.org/webquest/

PhylumMollusca.htm