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Zoology Lecture Unit 2 > Phylum Mollusca > Flashcards

Phylum Mollusca Flashcards

1
Q

Phylum Mollusca have a space that is mesodermally derived

A

coelomates

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2
Q

Phylum Mollusca

Feeding mechanisms

A

Herbivores, filter feeders, carnivores

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3
Q

Phylum Mollusca

Structure for excretion

A

Nephridia

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4
Q

Bilateral symmetry leads to

A

Cephalization

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5
Q

Phylum Mollusca symmetry type

A

bilateral symmetry

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6
Q

Phylum Mollusca

body organization level

A

organ system

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7
Q

Phylum Mollusca

circulatory system type

A

Open circulatory system

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8
Q

Phylum Mollusca

open circulatory system characteristics

A

Lacks capillaries
Have hemocoel
Slow blood flow; low efficiency

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9
Q

Hemocoel

A

Washes blood over organ

Inefficient

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10
Q

What class in Phylum Mollusca have a closed circulatory system?

A

Class Cephalopoda

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11
Q

Phylum Mollusca

Closed circulatory system characteristics

A

Efficient
Capillaries
High rate of flow

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12
Q

2 Phylum Mollusca body regions

A

Head-foot

Visceral mass

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13
Q

Phylum Mollusca head-foot purpose

A

Locomotion

Senses

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14
Q

Phylum Mollusca visceral mass purpose

A

Life’s processes

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15
Q

Phylum Mollusca

3 Layers of Calcareous shell

A

Periostracum - outer layer
Prismatic layer - middle layer
Nacreous layer - inner layer

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16
Q

Calcareous shell

Periostracum composition

A

Proteins

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17
Q

Calcareous shell

Prismatic layer composition

A

Proteins mixed with Calcium carbonate

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18
Q

Calcareous shell

Nacreous layer composition

A

Proteins alternating with calcium carbonate

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19
Q

Phylum Mollusca

Shell is secreted by the

A

Mantle

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20
Q

Phylum Mollusca

Shell is designed to protect

A

The visceral mass

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21
Q

Phylum Mollusca

Mantle Cavity exchanges with the environment

A

Reproduction
Respiration
Digestive
Excretory

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22
Q

Phylum Mollusca

Radula

A

Scraper

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23
Q

Class Gastropoda common names

A

Snails, slugs, abalone, cowry, conch

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24
Q

Gastropoda translation

A

stomach - foot

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25
Q

Class Gastropoda synapomorphy

26
Q

What is Class Gastropoda torsion

A

180 degree rotation of visceral mass

27
Q

Class Gastropoda

Advantages of torsion

A

Clean water goes on gills
Head goes in first
Waterproof seal - survive low tide

28
Q

Class Gastropoda
Digestive tract path
(5 Structures)

A

Mouth (radula) -> esophagus -> stomach (via cilia) -> intestine -> anus

29
Q

Class Gastropoda

Protostyle

A

Ball of food, mucous, enzymes

30
Q

Class Gastropoda

Reproduction (sexual)

A

Most are monoecious
Internal fertilization - egg + sperm unite inside female’s body
Many are Protandric

31
Q

Class Bivalvia common names

A

Clams, oysters, scallops

32
Q

Class Bivalvia are ___ and ___ feeders

A

Sedentary

Filter feeders

33
Q

Class Bivalvia

The gills are involved in

A

Respiration
Digestion
Excretion

34
Q

Class Bivalvia

Water Path

A

Incurrent aperture -> mantle cavity -> gills -> suprabrachial chamber-> mantle cavity -> excurrent aperture

35
Q

Class Bivalvia

Food Path

A

Incurrent aperture -> mantle cavity -> gills -> mouth (labial palps) -> Esophagus -> stomach (digestive gland) -> Intestine -> rectum -> mantle cavity -> excurrent aperture

36
Q

Class Bivalvia

Excretory Path

A

Incurrent aperture -> mantle cavity -> gills - > ammonia

37
Q

Class Bivalvia

Gas Path

A

Gills: CO2 out and O2 in

38
Q

Class Bivalvia

How does food move through the digestive tract?

39
Q

Class Bivalvia

Reproduction

A

Fertilization is inside mantle cavity

Larvae develop there

40
Q

Class Bivalvia

Glochidia Process

A

Female clam ejects glochidia and they lodge onto fish gills and eventually leave fish

41
Q

Class Cephalopoda common names

A

Squids, ocotopi

42
Q

Class Cephalopoda

Locomotion

A

Lateral fins
Jet propulsion
Pen

43
Q

Class Cephalopoda

Later fin purpose

A

Precise or extended swimming

44
Q

Class Cephalopoda

Jet propulsion purpose

A

Not precise, panicked

45
Q

Class Cephalopoda

Pen purpose

A

Rigid, helps to keep hydrodynamic design

Breaks hydrogen bonds

46
Q

Class Cephalopoda

How do they Hunt?

A

Hunt by sight

47
Q

Class Cephalopoda

How do they capture prey

A

Using tentacles and arms

48
Q

Class Cephalopoda

Eye structures

A

Lens, retina, cornea

49
Q

Class Cephalopoda

Suckers are controlled ___

A

Independently
Direction 180 degree rotation
Suction power

50
Q

Class Cephalopoda

Beaks purpose

51
Q

Class Cephalopoda
Radula purpose
Octupus/Squid

A

Octopus: boring holes in clamshell to inject venom
Squid: scrape flesh from bone

52
Q

Class Cephalopoda

How is food moved?

A

Peristalsis- muscles move food

53
Q

Class Cephalopoda

Circulatory system and number of hearts?

A

Closed, 3 hearts

54
Q

Class Cephalopoda

Systemic Heart

A

Pumps to body

55
Q

Class Cephalopoda

Brachial Hearts

A

Pumps to a set of gills

56
Q

Class Cephalopoda

Nervous System is very __ developed

57
Q

Class Cephalopoda

Nervous system characteristics

A

Learn by observation
Problem solving
Camouflage

58
Q

Class Cephalopoda

Solitary or colony

59
Q

Class Cephalopoda

Life-span

A

Short lived

Approximately 5 years

60
Q

Class Polyplacophora common name and general characteristics

A

Chitons,
8 hinged shells
intertidal
Dioecious

61
Q

Class Polyplacophora

Feeding

A

Territorial grazers

62
Q

Class Polyplacophora

Territorial grazing meaning

A

Exclusive rights to resources in an area

Mental map needed

Zoology Lecture Unit 2 (12 decks)

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