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Zoo 201 > Platyhelminthes > Flashcards

Platyhelminthes Flashcards

1
Q

The classes that make up the Platyhelminthes are

A

Turbellaria (planarians

Trematoda (flukes)

Cestoda (tapeworms)

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2
Q

Turbellaria are also known as

A

planarians

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3
Q

Trematoda are also known as

A

flukes

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4
Q

Cestoda are also known as

A

tapeworms

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5
Q

A genus within Turbellaria is

A

Dugesia

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6
Q

Two genuses within the Trematoda are

A

Fasciola and Schistosoma

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7
Q

A genus within the Cestoda is

A

Taenia

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8
Q

Platyhelminthes have how many germ layers

A

three

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9
Q

Platyhelminthes have no coelom which makes them

A

acoelomates

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10
Q

Platyhelminthes have cephalization which means that

A

they have an obvious “head” end

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11
Q

Platyhelminthes have a digestive tract.

A

incomplete

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12
Q

Platyhelminthes are characterized by their

A

flattened bodies

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13
Q

How do planarians feed?

A

by everting their ventral pharynx

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14
Q

What structure allows planarians to move?

A

cilia on their ventral side

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15
Q

planarians have the amazing ability to

A

regenerate

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16
Q

flukes and tapeworms are both

A

endoparasites

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17
Q

tapeworms have no

A

mouth or gut

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18
Q

The scolex of tapeworms is made up of

A

hooks and suckers

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19
Q

the Strobila of tapeworms is made up of

A

proglottids

20
Q

The strobila of tapeworms can be

A

immature, mature or gravid

21
Q

The two types of hosts for tapeworms are

A

definative (human)

intermediate (pig or dog)

22
Q

In the definitive host,

A

sexual reproduction occurs

23
Q

In the intermediate host,

A

asexual reproduction occurs through various larval stages

24
Q

The flukes definitive host is

A

in the liver of a sheep

25
Q

The intermediate host for a fluke is

A

a snail

26
Q

Dioecious means

A

each individual has male or female reproductive organs but not both

27
Q

monoecious means

A

each individual has male and female reproductive organs

28
Q

How can you tell if you’re looking at a midsection cross section of a Planaria?

A

it shows the pharynx

29
Q

How do Taenia pisiformis gravid proglottids differ from mature ones?

A

gravid proglottids have eggs

30
Q

Why does the meracercarial cyst stage of the fasciola hepatica occur on vegetation?

A

Because the vegetation is consumed by sheep which become the definitive hosts of the flukes.

31
Q

Which stage of the Fasciola hepatica is shown?

What happens to this after it leaves the intestines of a sheep?

A

the egg

it enters water where it undergoes embryological development before the next stage hatches out

32
Q
A
33
Q

Which stage of the Fasciola hepatica life cycle is pictured here?

What occurs during this stage?

A

Miracidium, also known as the free-swimming stage

In this stage, the miracidium seeks a fresh-water snail, burrows into it’s tissue and loses its cilia before moving on to the next stage.

34
Q

Where does the sporocyst stage of the Fasciola hepatica’s life cycle occur?

What occurs during this stage?

A

This occurs within the snail or intermediate host.

As the sporocyst grows, it asexually reproduces the next stage within itself.

35
Q

Which stage if the Fasciola hepatica life cycle is shown here?

What occurs during this stage?

A

Redia

The Redia leaves the sporocyst and lives within the liver of the snail. As it grows it asexually reproduces the next stage in itself.

36
Q

Pictured is which stage of the Fasciola hepatica life cycle?

What occurs during this stage?

A

Cercaria, which is another free-swimming stage

During this stage, the Cercaria leaves the snail and seeks out to find a particular plant. Once found, it settles on the plant’s surface and looses it’s tail, becoming the next stage of the life cycle.

37
Q

Pictured is which stage of the Fasciola hepatica life cycle?

What occurs during this stage?

A

Metacercaria

This stage remains on the plant until it is consumed by humans

38
Q

Pictured is which stage of the Fasciola hepatica life cycle?

Where does this take place?

A

Pictured is an adult sheep liver fluke.

This stage lives in the bile ducts of a sheep liver where it sexually produces eggs that pass into the intestine.

39
Q

Pictured is?

Name the numbered structures.

A

Dugesia

  1. Eye
  2. Digestive system
  3. Transverse muscle layer
  4. longitudinal muscle layer
  5. excretory system
  6. flame cell
  7. pharynx
  8. nerve cord
  9. brain
  10. ovary
  11. testes
40
Q

Name the numbered structures.

A
  1. parenchyma
  2. gastrodermis
  3. lumen of pharynx
  4. epidermis
  5. diverticula of intestinal cavity
  6. dorsoventral muscles
  7. circular muscles
  8. nerve cord
  9. pharyngeal cavity
  10. ciliated epidermis
  11. pharynx
  12. longitudinal muscles
41
Q

What genus of which class is pictured?

Name the numbered structures.

A

Dugesia of Turbellaria (planarians)

  1. eyespot
  2. auricle
  3. gastrovascular cavity
  4. pharynx
  5. mouth
  6. diverticulum of intestinal cavity
42
Q

Name the numbered structures.

A
  1. epidermis
  2. testis
  3. cilia
  4. pharyngeal cavity
  5. dorsoventral muscles
  6. gastrodermis = endoderm
  7. pharynx
43
Q

Name the numbered structures

A
  1. epidermis
  2. intestinal cavity
  3. mesenchyme
  4. dorsoventral muscles
  5. endoderm
44
Q

Pictured is

Name the numbered structures.

A

The scolex of Taenia pisiformis

  1. hooks
  2. rostellum
  3. suckers
45
Q

Pictured is?

Name the numbered structures.

A

the immature proglottids of Taenia pisiformis

  1. early ovary
  2. early testes
  3. excretory canal
  4. immature vagina and ductus deferens
46
Q

Pictured is?

Name the numbered structures (1,2,4,5).

A

the mature proglottid of Taenia pisiformis

  1. uterus
  2. ovary
  3. excretory canal
  4. testes
47
Q

Pictured is

Name the numbered structures.

A

the gravid proglottids of Taenia pisiformis

  1. zygotes in branched uterus
  2. genital pore

Zoo 201 (5 decks)

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