Platyhelminthes

Question 1

What does the life cycle of a cestode always involve?

Answer 1

Indirect and one or two intermediate hosts

Question 2

What are examples of intermediate hosts?

Answer 2

Arthropods
Fish
Mammals

Question 3

Can domestic animals be definitive hosts or intermediate hosts?

Answer 3

Can be both

Question 4

Eucestoda subclass

Answer 4

True tapeworms

Question 5

Cotyloda subclass

Answer 5

Pseudotapeworms

Question 6

What do the bodies of tapeworms look like?

Answer 6

Long
Flat
Ribbonlike
Composed of segments

Question 7

Do tapeworms have a body cavity?

Answer 7

No

Question 8

Where are organs located in a tapeworms?

Answer 8

Loosely embedded in cellular tissue

Question 9

How many regions does the tapeworm body consist of?

Answer 9

3 regions
Scolex
Neck
Body

Question 10

Scolex

Answer 10

Head

Attachment organ with 2 to 4 muscular suckers

Question 11

What are the muscular suckers called?

Answer 11

Acetabula

Question 12

Tapeworms may have a snout that may have hooks. What is it called?

Answer 12

Armed vs Unarmed

Question 13

Neck

Answer 13

Short

Undifferentiated tissue

Question 14

What is another name for the body of the tapeworm?

Answer 14

Strobila

Question 15

What is the body composed of?

Answer 15

Segments

Question 16

What are the segments called?

Answer 16

Proglottids

Question 17

What does each proglottid have?

Answer 17

Reproductive organs in three segments..
Immature
Mature
Gravid

Question 18

What does gravid mean?

Answer 18

Pregnant

Question 19

An owner does not bring in a fecal sample, just some proglottids. How do you determine what species it came from?

Answer 19

Break it open and examine it under the microscope

Question 20

Why do we care what species the proglottid come from?

Answer 20

So we can determine the host.
Fleas
Is the pet hunting?

Question 21

When a proglottid in the environment breaks open what does it release?

Answer 21

Thousands of hexacanth embryos

Question 22

What must the egg be ingested by?

Answer 22

Intermediate host

Question 23

What does the egg hatch into when it is inside the intermediate host?

Answer 23

Metacestode

Question 24

What are the forms that metacestode can take?

Answer 24

Cystecercoid
Cysticercus 
Coenurus
Hydatid cyst 
Tetrathyridium

Question 25

What does the form the metacestode takes depend on?

Answer 25

The type of tapeworm

Question 26

What happens when the intermediate host is ingested?

Answer 26

The metacestode form attaches to the small intestine and matures into the adult

Question 27

Cystecercoid

Answer 27

Arthropod intermediate host (flea)

Question 28

Cysticercus

Answer 28

Mammalian intermediate host “bladder worm”

Question 29

What metacestode form are both variation of bladder worms?

Answer 29

Coenurus

Hydatid cyst

Question 30

Tetrathyridium

Answer 30

Solid body
Invaginated scolex
Capable of asexual reproduction
Multiply exponentially