TAPEWORMS (Introduction)

Question 1

Two orders of Cestodes of veterinary importance

Answer 1

A. Order Cotyloda/Pseudophyllidae (Pseudotapeworms)
B. Order Eucestoda/Cyclophyllidae (True tapeworms)

Question 2

General Characteristics of Tapeworms

Answer 2

✓ w/ elongate flat body
✓ w/o body cavity
✓ w/o alimentary canal
✓ Hermaphroditic
✓ Part of the body (strobila) is segmented
✓ has an indirect life cycle

Question 3

Difference of organ attachment between Cyclophyllidae and Pseudophyllidae

Answer 3

Cyclophyllidae: SUCKERS AND ROSTELLUM
Pseudophyllidae: BOTHRIA

Question 4

Difference of Stage infective to 1st intermediate host between Cyclophyllidae and Pseudophyllidae

Answer 4

Cyclophyllidae: HEXACANTH EMBRYO
Pseudophyllidae: CORACIDIUM

Question 5

Difference of No. of intermediate host between Cyclophyllidae and Pseudophyllidae

Answer 5

Cyclophyllidae: ONE
Pseudophyllidae: TWO

Question 6

Difference of Egg Shedding between Cyclophyllidae and Pseudophyllidae

Answer 6

Cyclophyllidae: Via thysanus
Pseudophyllidae: Via Uterine pore

Question 7

metameric repetition of reproductive organs

Answer 7

proglottidization

Question 8

structures that develop once the uterus disappears by degeneration

Answer 8

Paruterine organs

Question 9

it assumes the function of the uterus e.g. _____________ capsules and dense areas of fibromuscular tissue

Answer 9

hyaline egg

Question 10

Cestode eggs

Answer 10

✓ embryonated or non-embryonated
✓ fully embryonated egg contains ONCOSPHERE
✓ oncosphere is a HEXACANTH EMBRYO with 3 hook pairs found at the center of a fully developed cestode egg
✓ typical oncosphere has 4 embryonic envelopes namely; EGG CAPSULE/SHELL, OUTER MEMBRANE, EMBRYOPHORE, ONCOSPHERAL MEMBRANE

Question 11

EGG HATCHING, Egg type and is effected by;

Answer 11

✓ environmental stimulus
✓ mechanical action
✓ digestive enzymes of host
✓ combination of mechanical and action of digestive enzymes

Question 12

species that effected by environmental stimulus

Answer 12

light in D. latum

Question 13

species under egg type and is effected by mechanical action

Answer 13

Anoplocephala

Question 14

Species under the egg type and is effected by digestive enzymes of host

Answer 14

Taenia

Question 15

eggs are covered or protected with material derived from the UTERUS

Answer 15

Egg Capsule

Question 16

eggs are covered with materials derived from the parenchyma

Answer 16

Egg pouches

Question 17

the infective larval form of tapeworms

Answer 17

Metacestode

Question 18

first metacestode stage of pseudophyliids; solid bodied with hooks on the cercomer in the posterior region

Answer 18

Procercoid

Question 19

follows a procorcoid; occurs in the second intermediate host of pseudophyliids, elongate, solid bodied and bears an adult scolex

Answer 19

Plerocercoid

Question 20

found only in Mesocesotoidea; worm like, solid larva with deeply invaginated scolex

Answer 20

Tetrathyridium

Question 21

single evaginated scolex embedded in a small solid cyst; found in small intermediate host such as arthropods. most common

Answer 21

Cysticercoid

Question 22

single scolex evaginated into itself in a large, fluid containing vesicle or bladder

Answer 22

Cysticercus

Question 23

single scolex invaginated and it attached to the cyst by a chain of asexual proglottids (resembling a juvenile strobila) which are digested away after ingestion by the final host living only the scolex

Answer 23

Strobilocercus

Question 24

large, fluid containing bladder lined with a germinal epithelium producing a number of invaginated scolices by budding which remains attached to the wall

Answer 24

coenurus

Question 25

large, fluid containing cyst with a laminated cuticular wall lined with a parenchymal inner layer producing many invaginated protoscolices which lies free or in bunches (blood capsules)

Answer 25

Hydatid

Question 26

specie under procercoid

Answer 26

Diphyllobothrium latum

Question 27

Specie under Plerocercoid

Answer 27

Spirometra mansoni

Question 28

Specie under cysticercus

Answer 28

Taenia saginata

Question 29

common name of Taenia saginata

Answer 29

Beef tapeworm

Question 30

Specie under Strobilocercus

Answer 30

Taenia taeniaformis