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PHYLUM MOLLUSCS (FORM & FUNCTION (MANTLE & MANTLE CAVITY (:squid:…
PHYLUM MOLLUSCS
FORM & FUNCTION
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RADULA
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:lips: Protruding, rasping, tongue-like organs :tongue:
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:lips: Pattern & number of teeth : used for classifcation of molluscs (some specialized to bore through hard material or harpoon teeth)
FOOT
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:footprints: Burrowers - extend the foot into mud/sand, enlarge tip as anchor & draw forward
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MANTLE & MANTLE CAVITY
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:squid: Product of digestive, excretory & reproductive system empty into the mantle cavity.
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:squid: In most molluscs, two ctenidia on opposite sides forms an incurrent & excurrent chamberr
SHELL
:octopus: If present, secreted by mantle & lined by it
:octopus: Periostracum: outer organic layer; made up of organic substance, conchiolin (consist of quinonetanned protein); function - protect calcerous layer from erosion by boring organisms
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Freshwater molluscs ada thick periostracum untuk protect againts acid dalam air yang dihasilkan oleh decay of leaf litter
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CHARACTERISTICS
EVOLUTION
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:earth_asia:Snails (gastropoda) succesfully invaded land - limited to moist, sheltered habitats with calcium in the soil
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:earth_asia:Coelom limited to a chamber around the heart; some believe molluscs arose separately from annelids & coelom are not homologous
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GENERAL
:snail: Living species: 90,000 ; Fossil species: 70,000
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:snail: Herbivorous grazers, predaceous carnivores, filter feeders & parasites
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