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Mollusca > mollusca > Flashcards

mollusca Flashcards

1
Q

Mollusca

A

means “soft body”

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2
Q

tube used to take in water (oxygen) and food.

A

siphon

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3
Q

meaning of Gastropoda

A

stomach foot

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4
Q

meaning of cephalopoda

A

head-foot

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5
Q

tissue that secretes a shell

A

mantle

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6
Q

Blood circulation is of this design

A

an open circulatory system

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7
Q

tongue-like structure with tiny bone plates

A

radula

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8
Q

type of circulation seen in this group

A

a closed circulatory system

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9
Q

structure used for locomotion

A

a foot

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10
Q

This structure can be made into an anchor or extended. by diverting blood into a particular sinus

A

foot

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11
Q

this structure produces a lubricating slime to aid in movement

A

the foot

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12
Q

feature that is highly evolved and approaches that of mammals in ability

A

the eyes

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13
Q

material shells are made of

A

calcium carbonate

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14
Q

gametes are spread into the water for fertilization and possible distribution

A

broadcast fertilization

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15
Q

term for organisms like snails which possess both gametes for fertilization

A

hermaphridite

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16
Q

the foot has specialized into these structures

A

what are arms and tentacles

17
Q

larval type shared with annelids

A

trochophore larva

18
Q

structure used for gas exchange

A

gills

19
Q

sensory structures found on snails

A

light sensitive eyes and antennae

20
Q

highly developed system in active predator, relative to that seen in a clam or a snail

A

nervous system

21
Q

class Mollusca

A

includes

  • class bivalvia (clams and oysters)
  • class Gastropoda (snails and slugs)
  • class Cephalopoda (octopus and squid)
22
Q

all members of Mollusca must have

A
  1. mantle
    - tissues that secretes shell material, calcium carbonate H20 out of siphon
  2. Muscular Foot
    - locomotary or clinging foot
  3. Soft-bodied
23
Q

Class Bivalvia (2 valves) (clams, oysters, mussels)

A
  • sessile
  • filter feeders
  • range of habitats due to siphon and shell
  • open circulatory system with 2 chambered heart
24
Q

Class bivalvia siphon and shells

A
  • siphon (double tube) take in food and oxygen get rid of waste and CO2
  • shell 2 part shell, closes tightly and retain water necessary for survival
25
Q

class bivalvia circulatory system

A

Open circulatory system with 2 chambered heart
§ Blood delivered to sinuses (chambers) in tissues
§ Soaks tissues delivering oxygen and
removing carbon dioxide
§ Blood can be withheld in a sinus, causing
tissue to swell up

26
Q

clams foot

A

can be extended and used as an anchor to aid in movement

27
Q

bivalvia are sessile animals

A
  • they broadcast gametes into water for distribution and possible fertilization
  • trocophorelarva (similar to Annelids) develops from zygote
  • gills exchange gases with water drawn in through siphon
28
Q

bivalvia digestive tract

A
  • simple,short
  • undigested material released through anus back into water via siphon
  • nephridia, removes metabolic waste-localized to one region
29
Q

bivalvia nervous system

A
  • not highly specialized due to sessile slow moving lifestyle
  • brain area + nerve cords operate foot and siphon
30
Q

Class Gastropoda (stomach foot) (snails, shells) (Slug, no shell)

A
  • snail mantle located around open edge of shell
  • Foot: compromises soft tissue mass on ventral surface
  • muscular undulations allow slow movement
  • slime acts as a lubricant when crawling
  • radula (tongue-like structure with bony plates) for feeding
31
Q

Class Gastrapoda are what

A
  • hermaphroditic (annelids, exchange sperm between reproductive organs on ventral surface)
  • fertilization occurs later; eggs deposited in damp places
32
Q

class Gastropoda nervous system

A
  • light sensitive “eyes” on retractable antennae
  • cephalized with distinct head region
  • 2 chambered hearts
  • open circulatory
33
Q

Class Cephalopoda (head foot) (squid, cuttlefish, octopus, nautilus.)

A
  • Most highly evolved/specialized members of phylum
  • hunters noted for subdivided foot, large heads, well-developed nervous systems and move quickly
  • closed circulatory system
  • zoom zoom fast
  • Efficient swimmers, move by jet propulsion water is forced out of siphon
34
Q

class cephalopoda eye

A

-similar ability to learn and behave in a complex manner

35
Q

LOOK AT MOLLUSCA SIAGRAMS

A

gang

Mollusca (3 decks)

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