FINAL WORLD CUP 2010
VS
WhaT is the score???
What is the kind of animal
can predict the winner???
Paul The Octopus
Phylum Mollusca
CHARACTERISTICS
• 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
CHARACTERISTIC
General Body Plan
Head
Ventrally located muscular foot
Dorsally located visceral mass
Covered by a fleshy outgrowth of the body wall called
a mantle/pallium
Radula 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
System Function
 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.
 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 - Mantle
 Endocrine - nervous systems produces hormones.
 Reproductive - varied- monoecious, or dioecious.
Larva in marine = trochophore and veliger, in
freshwater clam is glochidium.
CLASSIFICATION
1. Class Gastropoda
2. Class Bivalvia
3. Class Cephalopoda
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 / Pelecypoda
Bivalvia
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. swifti
C. islandicus
Perna (mussel) Class Bivalvia
P. veridis
Anodonta (freshwater clam) Class Bivalvia
A. suborbiculata
A. anatina
Class Cephalopoda
Cephalopoda
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