Helminthology

Question 1

5 Groups included under helmithology

Answer 1

1) Trematoda
2) Cestoda
3) Nematoda
4) Nematomorphs
5) Acanthocephala

Question 2

Digenetic

Answer 2

2 beginnings (Normally has two intermediate hosts)

Question 3

Morphology of Digenetic Flukes

Answer 3

D/V flattened
Smooth or spiny tegument
Oral sucker for feeding
Ventral sucker for attachment
Digestive, excretory, and nervous systems
Complex repro system - hermaphroditic

Question 4

Sexual Classification of Flukes

Answer 4

Hermaphroditic

Question 5

Typical Digenetic Fluke Life Cycle

Answer 5

Operculated egg–>Miracidium–>Sporocyst–>Redia–> Cercaria–>Metacercaria–>Adult fluke

Question 6

Operculated Egg

Answer 6

Produced by hermaphroditic fluke
Operculum (door) at one end (pole)
Undifferentiated mass of cells

Question 7

Miracidium

Answer 7

Triangular w/ broad ant. end; covered with cilia or hairs

Question 8

First Intermediate Host for Digenetic Fluke

Answer 8

Snail

Question 9

Sporocyst

Answer 9

Develops in snail; Rediae develop inside of it

Question 10

Redia

Answer 10

develop w/in sporocyst; inside develops many cercariae

Question 11

Cercaria

Answer 11

Leaves via snail’s skin to aquatic environment

Question 12

3 Things Cercaria can do

Answer 12

1) Penetrate or be ingested by 2nd int. host
2) attach to vegetation and become encysted
3) Penetrate definitive host directly

Question 13

8 Things to know for each parasite

Answer 13

1) Host
2) Habitat
3) Identification (visual)
4) Life Cycle
5) Clinical signs
6) Dx
7) Tx & control
8) Zoonotic potential

Question 14

Platyhelminthes are called _____ and are divided into 3 classes.

Answer 14

Flatworms

1. Trematoda (flukes)
2. Eucestoda (true tapeworms)
3. Cotyloda (pseudotapeworms)

Question 15

Monogenetic trematodes are _____, usually associated with aquatic environments. Therefore, they infest the skin and or the gills of? They DO NOT occur in domestic animals

Answer 15

Ectoparasites; fish, amphibians and reptiles,

Question 16

Digenetic trematodes are _____ of both domestic and wild animals and HUMANS

Answer 16

Endoparasites

Question 17

If the cercariae stage of the developing fluke penatrates or is ingested by the 2nd int. host or encysts upon vegetation, it enters into the _____ or the infective stage.

Answer 17

Metacercaria

Question 18

Metacercaria must reach the _____ host to complete the life cycle.

Answer 18

Definitive