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Zoology Lecture Unit 2 > Phylum Mollusca > Flashcards

Phylum Mollusca Flashcards

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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
Class Gastropoda synapomorphy
Torsion
26
What is Class Gastropoda torsion
180 degree rotation of visceral mass
27
Class Gastropoda | Advantages of torsion
Clean water goes on gills Head goes in first Waterproof seal - survive low tide
28
Class Gastropoda Digestive tract path (5 Structures)
Mouth (radula) -> esophagus -> stomach (via cilia) -> intestine -> anus
29
Class Gastropoda | Protostyle
Ball of food, mucous, enzymes
30
Class Gastropoda | Reproduction (sexual)
Most are monoecious Internal fertilization - egg + sperm unite inside female's body Many are Protandric
31
Class Bivalvia common names
Clams, oysters, scallops
32
Class Bivalvia are ___ and ___ feeders
Sedentary | Filter feeders
33
Class Bivalvia | The gills are involved in
Respiration Digestion Excretion
34
Class Bivalvia | Water Path
Incurrent aperture -> mantle cavity -> gills -> suprabrachial chamber-> mantle cavity -> excurrent aperture
35
Class Bivalvia | Food Path
Incurrent aperture -> mantle cavity -> gills -> mouth (labial palps) -> Esophagus -> stomach (digestive gland) -> Intestine -> rectum -> mantle cavity -> excurrent aperture
36
Class Bivalvia | Excretory Path
Incurrent aperture -> mantle cavity -> gills - > ammonia
37
Class Bivalvia | Gas Path
Gills: CO2 out and O2 in
38
Class Bivalvia | How does food move through the digestive tract?
Cilia
39
Class Bivalvia | Reproduction
Fertilization is inside mantle cavity | Larvae develop there
40
Class Bivalvia | Glochidia Process
Female clam ejects glochidia and they lodge onto fish gills and eventually leave fish
41
Class Cephalopoda common names
Squids, ocotopi
42
Class Cephalopoda | Locomotion
Lateral fins Jet propulsion Pen
43
Class Cephalopoda | Later fin purpose
Precise or extended swimming
44
Class Cephalopoda | Jet propulsion purpose
Not precise, panicked
45
Class Cephalopoda | Pen purpose
Rigid, helps to keep hydrodynamic design | Breaks hydrogen bonds
46
Class Cephalopoda | How do they Hunt?
Hunt by sight
47
Class Cephalopoda | How do they capture prey
Using tentacles and arms
48
Class Cephalopoda | Eye structures
Lens, retina, cornea
49
Class Cephalopoda | Suckers are controlled ___
Independently Direction 180 degree rotation Suction power
50
Class Cephalopoda | Beaks purpose
Killing
51
Class Cephalopoda Radula purpose Octupus/Squid
Octopus: boring holes in clamshell to inject venom Squid: scrape flesh from bone
52
Class Cephalopoda | How is food moved?
Peristalsis- muscles move food
53
Class Cephalopoda | Circulatory system and number of hearts?
Closed, 3 hearts
54
Class Cephalopoda | Systemic Heart
Pumps to body
55
Class Cephalopoda | Brachial Hearts
Pumps to a set of gills
56
Class Cephalopoda | Nervous System is very __ developed
well
57
Class Cephalopoda | Nervous system characteristics
Learn by observation Problem solving Camouflage
58
Class Cephalopoda | Solitary or colony
Solitary
59
Class Cephalopoda | Life-span
Short lived | Approximately 5 years
60
Class Polyplacophora common name and general characteristics
Chitons, 8 hinged shells intertidal Dioecious
61
Class Polyplacophora | Feeding
Territorial grazers
62
Class Polyplacophora | Territorial grazing meaning
Exclusive rights to resources in an area | Mental map needed

Zoology Lecture Unit 2 (12 decks)

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