CESTODES (Morphology)

• Describe the outer layer/ embryophore of Taenia and Ecchinococcus spp.

  Spherical, Thick-shelled, Brown & Striated
• Which cestodes spp have hexacanth Oncoshphere or embryo with polar thickenings?

  Hymenolepis
• Dipylidium caninum embryophore comes in capsules
• What is the embryo of Diphillobothrium latum and Spirometra spp?


  Undeveloped coracidium
• Describe the 2 structures found in Pseudophyllidean cestodes

  Inconspicuous operculum and Small terminal knob
• What is the main difference of Hymenolepis nana and Hymenolepis diminuta?


  Polar filaments are present in H. nana and absent in H. diminuta
• Color of Hymenolepis spp. embryophore or shell?

  Colorless
• Name the image: Hymenolepis nana ova

  
• Name the image: Hymenolepis diminuta

  
• What do you call free protoscolices?

  Hydatid sand
• Diagnostic stage of Echinococcus granulosus?

  Hydatid cyst or Daughter cyst
• Label the given

  A) host tissue

  B) outer lamellated hyaline layer

  C) Inner nucleated germinal layer

  D) Brood capsule

  E) Protoscolices

  F) Hooklets

  
• Which species has this structure?

  Spirometra

  
• what do you call the larva of Spirometra species?

  Sparganum
• Describe the sparganum of spirometra species

  With cleft-like invagination
• Scolex: anterior attachment organ
• Name the image: Bothriate

  
• Name the image: Acetabulate

  
• Scolex of Order Pseudophyllidea?

  Bothriate
• Scolex of Order Cyclophyllidea?

  Acetabulate
• Shape of taenia solium scolex?

  Quadrate
• Shape of Taenia saginata scolex?

  Cuboidal
• Describe rostellum of taenia solium scolex?


  cushion-like with double crown of 25-30 hooks
• Taenia saginata scolex are devoid of what?

  Hooks
• Name the specific cestode with this scolex: Taenia solium

  
• Name the specific cestode with this scolex: Taenia saginata
• Which cestode has this scolex?

  Taenia saginata

  
• shape of H. nana scolex?

  subglobular
• Shape of H. diminuta scolex?

  knob like
• describe rostellum of H. nana?

  Retractable, armed with single row of 20-30 Y-shaped hooklets
• Decribe rostellum of H. diminuta?

  Rudimentary unarmed rostellum
• What is this?


  Hymenolepis nana scolex

  
• what is this?


  Hymenolepis diminuta scolex

  
• Dipylidium caninum scolex shape?

  small, globular
• Echinococcus granulosus scolex shape?

  pyriform or globular
• Dipylidium caninum Rostellum: Protrusible, armed with 1-7 rows of rose thorn-shaped hooklets
• Echinococcus granulosus Rostellum: Armed with 30- 36 hooklets
• Dipylidum caninum scolex

  
• Echinococcus granulosus scolex

  
• Pseudophyllidean species scolex are devoid of what?

  Rostellum