Morphology and classification of Cyclophyllida Flashcards
(23 cards)
What class do Cyclophyllida belong to?
Cestoda
What are the main morphological features of Cyclophyllida?
Scolex, neck, strobila with proglottids, DV flattened, tegment on surface that resorb nutrients
What is the function of the scolex in Cyclophyllida?
Attachment to the host and nutrient absorption
What are the four muscular suckers on the scolex called?
Acetabula
What is a rostellum?
- A hooked or unhooked projection at the anterior end of the scolex, used for anchoring to the host’s intestinal lining. It plays a key role in attachment and survival within the host.
- A small, dome-shaped or conical structure, above the four suckers.
- Attach the tapeworm firmly to the intestinal wall of the host.
- Often armed with one or more rows of hooklets
What connects the head to the rest of the body in Cyclophyllida?
Neck
What is the strobila composed of?
A linear series of proglottids
What is a proglottid?
Each individual segment of the strobila, which is hermaphroditic and egg-producing
What is strobilation?
Asexual process forming segments in Cyclophyllida
What is unique about the digestive system of Cyclophyllida?
It is absent
What type of reproductive system do Cyclophyllida have?
Hermaphroditic
Where does fertilization occur in Cyclophyllida?
Internally
What are the male reproductive organs in Cyclophyllida?
Numerous testes, vas efferens, vas deferens, sperm duct, and cirrus sac
What happens to the eggs produced by female Cyclophyllida?
They stay in gravid proglottids and are excreted in feces
What is the main nerve center in Cyclophyllida?
Paired cerebral ganglion in the scolex
What excretory system do Cyclophyllida possess?
Nephridial excretory system
What is the morphology of Cyclophyllida eggs?
Embryonated, 3 thick shells, non-operculate, non-ciliated, varying shape, size, and color
What are the characteristics of the hexacanth larvae in Cyclophyllida?
Six hooklets
What are the three layers of the egg shell in Cyclophyllida?
Superficial layer, middle lipid layer, internal layer
What does a coenurus contain?
Invaginated scolices
What do hyaditid/echinococcus metacestodes contain?
Invaginated scolices containing suckers and hooks
Sumphylum of cestoda
Eucestoda
Families of cyclophyllidae
- Taeniidae: humans & animals
- Dilepididae: rodents & carnivores.
- Hymenolepididae
- Anoplocephalidae: ruminants and horses
- Mesocestoididae:
- Catenotaeniidae: Rare, infects reptiles
