Class Cestoda

Question 1

Cestoda characteristics

Answer 1

Most specialized class of flatworms
All endoparasites

Question 2

Body Plan

Answer 2

No head instead have scolex
Body consists of a long chain of reproductive sacs called proglottids

Question 3

Reproduction

Answer 3

Each proglottids act as individual
Any 2 can exchange sperm
All monoecious

Question 4

Life cycle

Answer 4

Almost all tapeworms require at least 2 hosts
Typically intermediate host is prey of adult host

Question 5

Examples of tapeworms

Answer 5

Beef tapeworms (Taenia saginata)
Pork tapeworm (Taenia solium)
Echinococcus (dog tapeworm)
Fish tapeworm (Diphyllobothrium latum)
Didphyllidium caninum

Question 6

Human costs of parasitic flatworms

Answer 6

Results in billions of dollars in healthcare costs and lost productivity
Affects livestock and pets

Question 7

Beneficial effects of parasitic flatworms

Answer 7

Weight loss
Helminth therapy

Question 8

Beef tapeworm characteristics

Answer 8

Picked up by grazing cattle
Scolex buries itself in intestinal wall
Adult in human intestine

Question 9

Pork tapeworm characteristics

Answer 9

More dangerous to humans
Adults usually live in human small intestine
Juveniles usually live in muscles of pigs
Scolex has hooks and suckers