Phylum Mollusca Flashcards

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0
Q

Class polyplacophora

A
  • chitons
  • intertidal zone
  • strong foot
  • use radula to feed
  • primitive
  • 8 valves to protect soft tissues
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1
Q

Mollusk

A
  • soft-bodied

- have internal or external shell

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2
Q

Class Gastropoda

A
  • snails, slugs, limpets, nudibranchs
  • shell-less or single shelled
  • muscular foot to move
  • visceral mass 180o counterclockwise inside shell
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3
Q

Defense:

A
  • nocturnal
  • pull into shell
  • toxic chemicals
  • brightly coloured
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4
Q

Shelled Gastropods

A
  • single non-twisted shell
    • ex. Abalone, limpet
  • single twisted shell
    • ex. Garden snail
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5
Q

Naked Gastropods

A
  • garden slugs
  • mantle-> saddle
  • nudibranchs
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6
Q

Why mucous?

A
  • prevents dessication
  • ease of movement
  • facilitate sperm transfer
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7
Q

Class Bivalva

A
  • ex. Scallops, oysters, clams, mussels
  • muscles & dorsal hinge hold shell together
  • use sticky threads, muscular foot, or rapidly flapping shells
  • adductor muscles to hold the valves together
  • have gills, not lungs
  • no radula
  • gills also used for gas exchange
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8
Q

Cephalopoda

A
  • ex. Octopi, squid, cuttlefish, nautilus
  • soft bodied
  • head attached to single foot modified into tentacles (8+)
  • complex eyes
  • pen = internal shell
  • nautilus has external shell
  • no shell in octopi
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9
Q

Key features of molluscs

A
  • bilateral
  • coelomates
  • complete digestive tract
  • unsegmented
  • foot
  • has mantle that secretes shell
  • radula
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10
Q

Movement

A
  • foot
  • flapping
  • jet propulsion
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11
Q

Respiration

A
  • oxygen exchange in gills
  • siphon pumps water to gills
  • gas exchange through skin
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12
Q

Feeding

A
  • filter-feeders

- use radula or tentacles

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13
Q

Reproduction

A
  • snails & bivalves: external fertilization
  • tentacled molluscs & some snails: internal
  • some are hermaphrodites
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14
Q

Internal circulation

A
  • open circulatory system

- dorsal heart

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15
Q

Excretion

A
  • cells release wasted into blood

- nephridia filter blood & release it to environment