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Principles of Zoology > Coelomate Invertebrates > Flashcards

Coelomate Invertebrates Flashcards

1
Q

Coelomates have a body design that:

A
  • repositions body fluid
  • allows complex tissues/organs to develop
  • allows larger body size
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2
Q

What is second in diversity?

A

mollusks

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3
Q

How are mollusks diverse?

A
  • wide variety in sizes and body forms

- different environments

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4
Q

What animals make up mollusks?

A

snails, slugs, clams, octopuses, and others

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5
Q

How are mollusks important to humans?

A

important food source

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6
Q

What are 4 classes of Mollusks?

A
  • Polyplacophora
  • Gastropoda
  • Bivalvia
  • Cephalopoda
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7
Q

What does the name Polyplacophora mean?

A

many plates

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8
Q

What does the name Gastropoda mean?

A

stomach foot

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9
Q

What does the name Bivalvia mean?

A

two shells

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10
Q

What does the name Cephalopdoa mean?

A

head foot

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11
Q

What is the phylum name for Mollusks?

A

Mollusca

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12
Q

What type of symmetry do mollusks have?

A

bilaterall

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13
Q

What is reduced in mollusks? What does it surround?

A

they have a reduced coelom surrounding the heart and excretory organs

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14
Q

Where are organs located in mollusks?

A

visceral mass

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15
Q

What is a visceral mass?

A

core parts of animal’s body where organs are located

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16
Q

How are mollusks’ head?

A

may have a differentiated head at the anterior end of the body

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17
Q

What allows for complex organisms?

A

having a coelomic cavity

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18
Q

What covers the Mollusks body?

A

mantle

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19
Q

What is a mantle?

A

a thick epidermis that covers the dorsal side of the body that houses organs

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20
Q

What organs does the mantle house?

A

respiratory, excretory, reproductive, and digestive

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21
Q

What respiratory organs do aquatic mollusks have?

A

ctenidia (gills)

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22
Q

What is the function of the foot of a mollusk?

A

locomotion, attachment, and food capture (not all use it for food capture)

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23
Q

What is the shell of a mollusk secreted from?

A

mantle tissue

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24
Q

Do all mollusks have an exterior shell?

A

no, some have interior and some have none at all

25
Q

What are shells made of?

A

calcium, carbonate rich

26
Q

What is the function of a shell?

A

protection

27
Q

How do mollusks remove waste?

A

Nephridia

28
Q

What is nephridia?

A

special excretory structures that remove nitrogenous wastes

29
Q

What type of circulatory system do mollusks have?

A

all except Cephalopods have an open circulatory system, they have a closed

30
Q

What is an open circulatory system?

A

-blood is contained in connected chambers surrounding various organs instead of within blood vessels

31
Q

What is a closed circulatory system?

A

blood is contained within the blood vessels

32
Q

What allows cephalopods to move fast?

A

efficiency of a closed circulatory system

33
Q

What allows organisms to be large?

A

closed circulatory system

34
Q

Are mollusks sex separated or hermaphroditic?

A

distinct male and female individuals in most

35
Q

What type of fertilization do mollusks do?

A

external

36
Q

What are mollusk larvae like?

A

free-swimming

37
Q

What animal are class Polyplacophora?

A

Chitons

38
Q

What do Polyplacophora look like?

A

oval bodies, eight overlapping dorsal calcareous plates

39
Q

Are Polyplacophora segmented?

A

no

40
Q

What diet do Polyplacophora have?

A

grazing herbivores

41
Q

How do Polyplacophora plates move?

A

having multiple plates allows the body to curve to match rock

42
Q

What is the function of the shell of Polyplacophora?

A

protects the Chiton from drying out when exposed to dry air

43
Q

What are the “teeth” of Polyplacophora called?

A

radula, used for scraping

44
Q

What animal are class Gastropoda?

A

snails and slugs

45
Q

What are Gastropoda eyes like?

A

tentacles with eyes

46
Q

Can Gastropods see?

A

can see images (not well)

47
Q

How do snails embryologically develop?

A
  • torsion

- coiling

48
Q

What is torsion?

A

mantle and anus cavity move from the posterior to the front because it rotates during embryonic development (counter clockwise rotation)

49
Q

What is coiling?

A

spiral winding of the shell

50
Q

What animals are under class Bivalvia?

A

clams, scallops, mussels, oysters, and others

51
Q

What is the body of a Bivalvia like?

A

2 lateral (right and left) shells (valves) hinged together dorsally

52
Q

How do Bivalves eat?

A

sessile filter-feeders, siphon water across gills

53
Q

What does sessile mean?

A

fixed in one place

54
Q

Do Bivalvia move?

A

some can. Clams can dig with foot and move on sand, all move as larvae

55
Q

Are Cephalopods prey or predators?

A

active marine predators

56
Q

What do Cephalopods body look like?

A

series of arms with suction cups

57
Q

How are Cephalopods advanced?

A

have highly developed nervous system

58
Q

How is the Cephalopod nervous system highly developed?

A

they exhibit complex patterns of behavior and high level of intelligence

Principles of Zoology (20 decks)

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