Phylum Molluska Flashcards

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1
Q

beak

A

oral feeding structure cephalopods

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2
Q

molluscus

A

soft bodied

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3
Q

bilateral

A

having two identical halves

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4
Q

jet propulsion

A

mode of locomotion for octopi and squid

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5
Q

bioremediation

A

using organisms to clean up the environment

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6
Q

closed circulatory system

A

blood never leaving the blood vessels

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7
Q

class cephalopods

A

“head-foot” soft bodied, having tentacle foot for predation, head attached to a single foot, foot divided into tentacles with suckers. nautiluses do not have suckers but have sticky mucus covering. small internal shell except for nautiluses. octopi have no shell, complex sensory organs. been here for 500 million years.

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8
Q

open circulatory system

A

simple heart blood pumps through vessel, system in which blood leaves the blood vessels to fill different body sinuses (sac-like spaces). blood passes from sinuses to gills for gas exchange. returns to hear and ideal for slow moving animals.

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9
Q

visceral mass

A

consists of internal organs

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10
Q

filter feeder

A

mode of nutrient gathering for oysters and other bivalves

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11
Q

class Gastropoda

A

“stomach foot” includes snails, slugs and nudibranches, shell-less or single-shelled. moves via muscular foot on ventral side. (pondsnails, land slugs, limpets, sea hares, sea butterflies, marine slugs (nudibranches).

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12
Q

radula

A

structure used for feeding, flexible tongue shaped structure in slugs and snails

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13
Q

mantle

A

thin layer of tissue covering most of the mollusk body

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14
Q

siphon

A

tube-like structure through which water enters and leaves the body, direct water from gills which captures plankton in mucus cilia moves food into mouth.

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15
Q

class bivalves

A

having two shells held together with powerful muscles. (clams, oysters, mussels, scallops). filter feeders, sedentary life style.

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16
Q

chitons

A

protective structures of calcium carbonate

17
Q

trochophore

A

free-swimming larvae

18
Q

phylum - molluska

A
invertabrates
shell-fishes
molluscus - soft-bodied
external or internal shell
organisms included: snails, slugs, clams, oysters, squids, octopi.
been around for 550 million years
19
Q

form and function

A

colem

complex organ system

20
Q

body plan

A

has four parts

  1. foot
  2. mantle
  3. shell
  4. visceral mass
21
Q

foot

A

many forms and functions, flat shaped for crawling, sad-shaped structures for burrowing, tentacles for capturing

22
Q

shell

A

made by glands in mantle, secretes calcium carbonate, some have shed the shell (slugs)

23
Q

feeding

A

herbivores - scrape algae, carnivores- drill through shells, tear tissue of prey, filter feeders, parasitic, detritivores. many teeth attached, octopi produce toxins to paralyze prey. clams and oysters filter feed using feathery gills.

24
Q

respiration

A

aquatic mollusks use gills inside mantle cavity, land snails respire via surface of mantle cavity lined with blood vessels. gases diffuse across surface area. needs to be moist.

25
Q

circulation

A

oxygen and nutrients carried throughout body via open or closed circulatory system.

26
Q

excretion

A

cells released nitrogen-containing wastes into blood. Nephridia remove ammonia from blood to be released out of the body.

27
Q

response

A

simple nervous system in clams and other bivalves. small ganglia near mouth, few nerve cords. simple sense organs (chemical receptors), (eye spots). complex systems in octopi and relatives, octopi have highly developed brains - highly intelligent. most developed nervous system of all invertebrates.

28
Q

movement

A

snails crawl along foot which secretes mucus. octopi use jet propulsion with water drawn into mantle cavity and then forced out through siphon.

29
Q

reproduction

A

most snails and bivalves reproduce sexually. release sperm into water which fertilizes eggs externally. eggs develop into free-swimming larvae. tentacle mollusks and come snails have internal fertilization. some mollusks are hermaphoditic.

30
Q

ecology of mollusks

A

eat detritus, filter algae- from water. some ahem symbiotic relationships with algae, bacteria, or parasites. some are parasitic, food for many organisms. bioremediation, medical application for finding cure for cancer - mollusks never have cancer.

31
Q

Foot

A

Versatile body part with various form and function

32
Q

Ctenidium

A

Feathery gills of squids

33
Q

Nautilus

A

Shelled cephalopods

34
Q

Lateral fin

A

Stabilizing appendages of a squid

35
Q

Octopus

A

Shell-less mollusk

36
Q

Nephridia

A

Tube shaped structure for removing nitrogenous wastes