the clam dissection taxonomy and general info kingdom animalia –phylum mollusca – “soft...
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The Clam Dissection
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Taxonomy and General Info
• Kingdom Animalia– Phylum Mollusca – “soft body”
• Class Bivalvia – “two valves”
• Clams are sessile
• Clams are filter feeders
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External Anatomy
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External Anatomy Continued
• two valves: three layers– outer layer: protects against acidic conditions
– middle layer: CaCO3 – strength and structure
– inner layer: iridescent, smooth: protects “soft body” of clam
• creates pearls from grains of sand
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Open Sesame
• use scissors to cut connection of posterior and anterior adductor muscles
• pull open with fingers
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Internal Anatomy
• Systems:– Muscular– Respiratory– Circulatory– Digestive– Excretory– Reproductive– Nervous
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Muscular System
• foot located ventral to the gills
• contracts and expands by filling and releasing hemolyph
• foot used to grab surface and movement
• anterior and posterior adductor muscles:– open and close the valves
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Respiratory System
• Gills
• current of water moves over gills where Oxygen is exchanged for Carbon Dioxide
• 2 pair of gills per side
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Circulatory System
• Open circulatory sytem
• dorsally located heart – along midline under hinge ligament
• heart pumps hemolymph into hemocoel
• current of water created by siphons moves hemolymph back to heart
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Digestive
• mouth >>> esophagus >>> stomach >>> intestine >>> anus >>> excurrent siphon
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Excretory System
• kidneys filter hemolymph
• cellular and digestive waste are removed by excurrent siphon
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Reproductive System
• separate sexes
• external fertilization
• trochophore larva
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Nervous System• three pair of ganglia – connected by nerve
cords– one in stomach– one in foot– one near mouth
• senses:– touch, taste