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FINAL WORLD CUP 2010 - PowerPoint PPT Presentation


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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

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FINAL WORLD CUP 2010

VS

WhaT is the score???

slide7

CHARACTERISTICS

  • Molluscamolluscus 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
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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
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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.
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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.
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CLASSIFICATION

  • Class Gastropoda
  • Class Bivalvia
  • Class Cephalopoda
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ClassGastropoda

  • Gastropodagaster=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.
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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
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Pila (freshwater kuhol)

Class Gastropoda

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Spanish shawl

Nudibranchs

Sea slug

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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.
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S. princeps

Spondylus (scallop) Class Bivalvia

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C. swifti

C. islandicus

Chlamys (scallop) Class Bivalvia

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A. suborbiculata

Anodonta (freshwater clam) Class Bivalvia

A. anatina

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Class Cephalopoda

  • Cephalopodachepalo= 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
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Class Cephalopoda

  • Well-defined head
  • Complex eyes
  • Brain in cartilaginous cranium
  • (+) radula
  • Beak-like jaws
  • Tentacles surrounding mouth
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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 Tricadacnasp