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Zoology Lecture Unit 2 > Phylum Platyhelminthes > Flashcards

Phylum Platyhelminthes Flashcards

(56 cards)

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1
Q

“Platy-“ meaning

“-helminthes” meaning

A

flat

worm

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2
Q

Platyhelminthes common names

A

tapeworms, flukes, free-living flatworms

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3
Q

Platyhelminthes

Acoelomate

A

No space between gut and body wall

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4
Q

Platyhelminthes digestive tract type?

A

incomplete digestive tract

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5
Q

Platyhelminthes feeding mechanisms

A

predators, herbivores, fluid feeding, surface nutrient absorption

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6
Q

Fluid feeding

A

Consume liquids from “prey”

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7
Q

surface nutrient absorption

A

Nutrients diffuse into body

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8
Q

What class can do surface nutrient absorption? Where do they live?

A

Cestoda (tapeworms)

Live in intestine

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9
Q

What Platyhelminthes class has no digestive tract?

A

Cestoda; tapeworms

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10
Q

Platyhelminthes have High surface area-to-volume ratio for

A

High air supply for low volume

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11
Q

Platyhelminthes structure for excretion?

A

Protonephridium

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12
Q

cephalization

A

Concentration of sensory neurons up at the front

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13
Q

Platyhelminthes

Structure that receive sensory info and coordinate a response

A

Ganglia

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14
Q

Do Platyhelminthes need a circulatory system?

A

No

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15
Q

How are Platyhelminthes flattened?

A

Dorsoventrally

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16
Q

Are Platyhelminthes parasitic or free living?

A

Both

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17
Q

Lophotrochozoa group characteristics

A

Similar larvae
Non-molting
Triploblastic
Bilateral symmetry

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18
Q

Class Turbellaria common name

A

Free living flatworms

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19
Q

Platyhelminthes synapomorphy

A

similar larvae

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20
Q

Where can you find Class Turbellaria?

A

Freshwater, marine, terrestrial

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21
Q

Class Turbellaria locomotion structures?

A

Cilia

Longitudinal muscles

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22
Q

Where is Class Turbellaria cilia located?

A

Ventral only

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23
Q

What are Class Turbellaria longitudinal muscles for?

24
Q

Class Turbellaria 3 muscle layers

Study These Flashcards
A

Circular muscles

Longitudinal muscles

25
Class Turbellaria circular muscles are for
Fragmentation | Asexual reproduction
26
Class Turbellaria dorsoventral muscles are for
Internal movement and flattening
27
Class Turbellaria feeding
Herbivores, predators | Detritivores (eat dead stuff)
28
Class Turbellaria eyes are called?
ocelli or simple eyes
29
Class Turbellaria ocelli characteristics
Photosensitive | light/dark
30
Class Turbellaria "ears" are called?
Auricles
31
Class Turbellaria Auricles sensitivity type?
Chemosensitive Aware of smells in the environment
32
Chemosensitive means
Aware of smells in the environment
33
Class Turbellaria have generalized ____
Mechanoreceptors
34
Class Turbellaria sexual reproductive parts?
Monoecious
35
Class Turbellaria often reproduce via
Bidirectional sperm exchange
36
Class Turbellaria sometimes reproduce via
Penis fencing
37
Class Turbellaria asexual reproduction type?
Fragmentation
38
Class Trematoda common name
Flukes
39
Class Trematoda glycocalyx
non-living outer layer that helps with diffusion and protective against host's immune system
40
Class Trematoda are all
Parasitic
41
Class Trematoda | Sheep Liver Fluke life cycle
Adult fluke is in sheep liver -> eggs in feces -(hatch) -> miracidia - (burrow/ingest)-> snail -(encyst)-> Sporocyst -(asexual reproduction)-> rediae -(asexual reproduction)-> cercariae -(exit snail)-> (aquatic plant) -> (encyst)-> metacercariae -(ingest)-> Adult in sheep liver
42
Class Trematoda | Sheep Liver Fluke determinate host
The Sheep
43
Class Trematoda | Sheep Liver Fluke indeterminate host
Snail, aquatic plant
44
Class Cestoda common names
Tapeworms
45
Class Cestoda are all
Parasitic on vertebrate animals | in small intestine
46
Class Cestoda length
1mm-25m
47
Most developed Class Cestoda system
Reproductive system
48
Class Cestoda top "head" region is called
Scolex
49
Class Cestoda region after scolex?
Strobila
50
Class Cestoda strobila proglottid development sucession
Immature proglottid Male proglottid Female proglottied
51
Protandrous
Male first then develop female parts
52
Protogynous
Female first then develop male parts
53
Class Cestoda tegument
Protective non-living layer
54
Class Cestoda tegument protects from
Host's immune system and digestive system
55
Class Cestoda | Beef tapeworm life cycle
Adult in human small intestine -(eggs in feces)-> -(ingested by cattle)-> -(encyst in skeletal muscle)-> Rare meat ingested -> Adult in human small intestine
56
Parasitism in platyhelminthes is an ___
apomorphy relatively new characteristic for this phylum

Zoology Lecture Unit 2 (12 decks)

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