Hymenolepsis nana (Hymenolepsis spp.)

Question 1

Meaning of Hymen

Answer 1

Membrane

Question 2

Meaning of Lepis

Answer 2

Covering

Question 3

Smallest Cestode

Answer 3

Hymenolepsis nana

Question 4

Most common cestode of man

Answer 4

Hymenolepsis nana

Question 5

Common Name

Answer 5

Dwarf Tapeworm

Question 6

Habitat

Answer 6

Smalle intestine

Question 7

Intermediate Host

Answer 7

 Direct: N/A
 Indirect
o Rice/Flour Beetles (Tribolium and Tenebrio spp.)
o Dog Flea (Ctenophalides canis)
o Human flea (Pulex irritans)
o Rat flea (Xenopsylla cheopsis)
o German cockroach (Blatella germanica)

Question 8

Final Host of Hymenolepsis nana

Answer 8

Man

Question 9

Larval stage of Hymenolepsis spp.

Answer 9

Cysticercoid larva

Question 10

Infective Stage

Answer 10

Direct: Embryonated ova
Indirect: Cysticercoid larva

Question 11

Mode of Transmission

Answer 11

Ingestion of embryonated ova/cysticercoid larva

Question 12

Scolex (Adult)

Answer 12

With 4 cuplike suckers
With retractable armed rostellum (single row of 20 - 30 & shaped hooklets)

Question 13

Strobila (Adult)

Answer 13

200 segments/proglottids

Question 14

Gravid Proglottids (Adult)

Answer 14

Sac-like (Saccular) filled with eggs
Craspedote – slightly overlaps

Question 15

Length (Adult)

Answer 15

1-4 cm

Question 16

Hooklets (Ova)

Answer 16

3 pairs (Hexacanth embryo)

Question 17

Polar Thickening (Ova)

Answer 17

Present (2 polar)

Question 18

Polar Filament (Ova)

Answer 18

4-8 polar filaments