Lab 5-Acanthocephala

Question 1

Common name

Answer 1

thorny-headed worm

Question 2

2 body regions:

Answer 2

• posterior

- anterior

Question 3

Where is the retractable proboscis?

Answer 3

anterior

Question 4

What is on the posterior?

Answer 4

trunk/soma

Question 5

What gripping structure is on the proboscis?

Answer 5

hooks

Question 6

Receptacle

Answer 6

proboscis sheath

Question 7

Does it have tegument?

Answer 7

yes

Question 8

Lacunae

Answer 8

canal within tegument

Question 9

Do Acanthocephalans have digestive tract?

Answer 9

No

Question 10

Saefftigen’s pouch

Answer 10

muscular sac used to manipulate bursa of males

Question 11

Separate sexes?

Answer 11

yes

Question 12

What hatches out of eggs?

Answer 12

acanthor

Question 13

Life stages starting from egg (x4)

Answer 13

egg –> acanthor –> acanthella –> cystacanth

Question 14

What is the earliest stage that Acanthocephalans are infective to hosts?

Answer 14

cystacanth

Question 15

Where do adults live?

Answer 15

intestines of vertebrates

Question 16

Where does acanthella develop?

Answer 16

hemocoele

Question 17

How does definitive host contract parasite?

Answer 17

by eating infected intermediate host

Question 18

Aquatic or terrestrial?

Answer 18

either or

Question 19

Can they modify behaviour of intermediate host?

Answer 19

yes

Question 20

Do they use paratenic host?

Answer 20

yes