FINAL WORLD CUP 2010

VS

WhaT is the score???

What is the kind of animal can predict the winner???

Paul The Octopus

Phylum Mollusca

• Mollusca molluscus means soft,are group of soft-body animals.

• Second largest phylum in the animal kingdom

• A milimeter till 18 meter length.• Occur in a wide variety of environments

CHARACTERISTICS

CHARACTERISTICGeneral Body Plan

HeadVentrally located muscular footDorsally located visceral massCovered by a fleshy outgrowth of the body wall called a

mantle/palliumRadula a tongue-like structure bearing transvers rows of

chitinous teeth (except for bivalves) Complete digestive tract, mouth, esophagus, stomach,

intestine, and anus.Gonads in visceral mass

Skeletal- Mantle may secretes a shell. Use hydrostatic pressure for ventral muscular foot.

Muscles -Ventral muscular foot and other muscles present.

Digestive- complete complex with salivary glands, digestive gland and Rasping tongue (Radula).

Circulatory - Open Circulatory System except for Cephalopoda. Dorsal heart, usually in a pericardial cavity.

Respiratory - Ctenidia (gills) in mantle cavity, respiratory pigment.

System Function

Excretory- by nephridia act as kidney usually connecting to the pericardial cavity,

Nervous - Nerve ring with various pairs of ganglia—two pairs of nerve cords, one innervating the foot, the other the visceral mass (modified ventral ladder-like system)

Integumentary - MantleEndocrine - nervous systems produces hormones.Reproductive - varied- monoecious, or dioecious.

Larva in marine = trochophore and veliger, in freshwater clam is glochidium.

1. Class Gastropoda

2. Class Bivalvia

3. Class Cephalopoda

CLASSIFICATION

Class Gastropoda

Gastropoda gaster=belly, podos=food Members usually sluggish and sedentary Mostly with asymmetrical bodies Move couse muscular contraction, that satrt

from posterior till anterior Univalves, Shell usually spiral, distinct head,

scraping radula. Visceral mass typically turned 180°

counterclockwise = torsion.

General Stucture of Gastropoda

RADULA•Toothed chitinous ribbon in the mouth of most mollusks•used for cutting and chewing food before it enters the esophagus•It is present in all molluscs except bivalves

Pila (freshwater kuhol) Class Gastropoda

Haliotis (abalone); Class Gastropoda

Turbo (turban snailClass Gastropoda

Cypraea (cowries) Class Gastropoda

Nudibranchs

Spanish shawl

Sea slug

Class Bivalvia / PelecypodaBivalvia bi= two, valvia=valve Hatchet/axe shaped foot in burrowers Head lacks eyes, radula and tentacles Shell of two lateral valves, with dorsal hinge. Mantle of flattened right and left lobes.

Posterior margin commonly forming siphons Labial palps beside mouth Has ligament at dorsal end, act as hinge Bivalve shell composed of periostracum,

prismatic, nacreus layer.

Tridacna (giant clam) Class Bivalvia

Spondylus (scallop) Class Bivalvia

S. princeps

Chlamys (scallop) Class Bivalvia

C. islandicus

C. swifti

Perna (mussel) Class Bivalvia

P. veridis

Anodonta (freshwater clam) Class Bivalvia

A. suborbiculata A. anatina

Class CephalopodaCephalopoda chepalo= head, podos=food• Free-swimming• Fast moving• Active carnivores• Elongated body• Skeleton may be external, internal or absent• Foot developed into prehensile arms or tentacles• Large head with conspicuous eyes• Ventral foot modified into tentacles(are arms)

with suckers

Class Cephalopoda

• Well-defined head • Complex eyes• Brain in cartilaginous

cranium• (+) radula• Beak-like jaws• Tentacles

surrounding mouth

Loligo (squid) Class Cephalopoda

The Role of Mollusca for Human•A high-protein source•Jewelry such as pearl oyster•Decoration and buttons such as the shell of rock oyster•Terrazo materials such as the shell of Tricadacna sp