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PHYLUM MOLLUSCA :squid: (GASTROPODS (Nutrition & Digestion (:dizzy:…
PHYLUM MOLLUSCA :squid:
BIVALVES
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Nervous system
:star: Sensory cells - lights, chemical, touch
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Nutrition
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:shallow_pan_of_food: Lamellibranchia, Filibranchia- utilize smaller food particles
Reproduction
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:smiley: Marine: Blastula :arrow_right: Gastrula :arrow_right:Trocophore :arrow_right: Veliger :arrow_right: Juvenile :arrow_right: Adult
Anatomy
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:pen: Mantle -secretes main shell vaves, ligament & hinge teeth.
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Example
:shell: Mussels, Oyster & Scallop.
:shell: M'SIA : Tridacna gigas, T.maxima, T.squamosa, T.crocea & Hippopus hippopus
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GASTROPODS
Main Characteristics
:pencil2: Head, eyes & sensory tentacles
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Habitat
Terrestrial, marine & freshwater
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Shell characteristics
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:fountain_pen: Shell veliger (larva) - protoconch, Adult shell - Teloconch
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:fountain_pen: horn-like material, but some calcareous
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Materials
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:bulb:Inner shell layers: calcium carbonate
crystals – aragonite, calcite
Nutrition & Digestion
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:dizzy: Enzymes – salivary glands, esophageal pouches, digestive ceca
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CEPHALOPODS
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Digestive system
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:hourglass_flowing_sand:Digestive glands (Crop,Stomach, Caecum & Intestine)
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Nervous & sense organ
:wilted_flower:Ganglia large & close each other, form large brain
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:wilted_flower: can distinguish brightness, size, shape & horizontal / vertical object
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DIFFERENCES
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Examples
Gastropods: snail,slug,sea hare
Cephalopods: octopus, squid, cuttlefish.
Bivalves: clams, oyster, mussel, scallop
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NUR ZAFIRAH BINTI ALIAS
S54483
FIS 3104
BIO INVERTEBRAT AKUATIK II
SUMMARY OF MOLLUSCS
DR WAN MOHD RAUHAN BIN WAN HUSSIN