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WHO’S WHO?
GASTROPODS
SNAIL
BIVALVES
SCALLOP
CEPHALOPODS OCTOPUS
MOLLUSKS
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BASIC CHARACTERISTICS
• BILATERAL SYMMETRY
• SOFT BODIES – MANY HAVE SHELLS FOR PROTECTION
• MANY HAVE A RADULA FOR FEEDING
(A RASPING TONGUE)
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SNAIL’S MOUTH & RADULA
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BASIC CHARACTERISTICS
• HEAD: CONTAINS THE BRAIN, EYES, MOUTH
• FOOT: MUSCULAR ORGAN USED FOR LOCOMOTION OR ATTACHMENT
• VISCERAL MASS: BODY AREA WHICH CONTAINS MAJOR ORGANS
• MANTLE: SPECIALIZED ORGAN WHICH MAKES THE CALCIUM CARBONATE SHELL & ADDS COLOR
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BODY REGIONS OF COMMON MOLLUSKS
SHELL
VISCERAL MASS
MANTLE
FOOT SHELL
MANTLE
FOOT
FOOT
SHELL
MANTLE
VISCERAL MASS
VISCERAL MASS
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CLASS: BIVALVES “TWO SHELLS”
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BIVALVE CHARACTERISTICS • 2 SHELLS ARE CALLED VALVES
• ALL ARE FILTER FEEDERS – EAT PLANKTON
• CILIA CREATE A WATER CURRENT. AS WATER PASSES OVER THE GILLS, OXYGEN IS ABSORBED AND FOOD IS PASSED TO THE MOUTH.
Siphons
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CLAMS • BURROWING/DIGGING ANIMALS
• EXTEND SIPHONS TO FEED ON PLANKTON, GET OXYGEN & RELEASE WASTES
• CLAMS USE A MUSCULAR FOOT TO DIG
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COQUINAS
SIPHON
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QUAHOG CLAM
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RAZOR CLAM
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SOFT SHELL CLAM
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GIANT CLAMS
SIPHON
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MUSSELS
• MOST ATTACH TO HARD SURFACES
• ATTACH TO OBJECTS WITH BYSSAL THREADS (STRONG FIBERS)
BYSSAL THREADS
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RIBBED MUSSEL
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BLUE MUSSEL
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MUSSELS
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MUSSELS FEEDING
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OYSTERS
• ONE SHELL IS PERMANENTLY ATTACHED TO A HARD SURFACE (DO NOT BURROW)
• OYSTERS MAKE PEARLS! PEARLS ARE MADE WHEN A PARTICLE (SAND) GETS INTO THE SHELL & IRRITATES THE MANTLE.
IN RESPONSE THE MANTLE COVERS IT WITH A LAYER OF SHELL MATERIAL OVER & OVER & OVER AGAIN.
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PEARLS
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EASTERN OYSTER
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PACIFIC OYSTER
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EDIBLE OYSTER
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OYSTERS ON ROCK
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SCALLOPS
• MOBILE ANIMALS – CAN “SWIM” BY OPENING & CLOSING THEIR SHELLS RAPIDLY
• HAVE “EYES” ON THE MANTLE (LIGHT SENSITIVE)
“EYES”
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BAY SCALLOP
“EYES”
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BAY SCALLOP
“EYES”
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SCALLOP GUTS
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SCALLOPS
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PINK SCALLOP
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ROCK SCALLOP
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KELP SCALLOP
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DEEP-SEA SCALLOP
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UP CLOSE & PERSONAL WITH A CLAM
EXCURRENT SIPHON (WATER,CO2,WASTES OUT)
INCURRENT SIPHON (WATER,O2,FOOD IN)
FOOT – FOR DIGGING
GROWTH LINES
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SHELL SHELL
MANTLE MANTLE
GILLS GILLS
FOOT
INTESTINE
HEART
BLOOD VESSELS (CLOSED SYSTEM)
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MUSCLE SCAR
MUSCLE SCAR
PALLIAL LINE
ADDUCTOR MUSCLE - HOLD SHELL CLOSED
GILLS FOOT
ADDUCTOR MUSCLE - HOLD SHELL CLOSED
HINGE LIGAMENT – HOLDS 2 SHELLS TOGETHER
MANTLE - MAKES SHELL
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LABIAL PALPS BRING FOOD TO THE MOUTH
MOUTH
ESOPHAGUS
STOMACH
DIGESTIVE GLAND
INTESTINE
HEART
EXCURRENT SIPHON
INCURRENT SIPHON