Platyhelminthes II (basics) Flashcards
Acraspedote
no overlapping of proglottids
Pseudophyllidea (3) vs Cyclophyllidea (2)
Pseudophyllidea: need water, have 2 intermediate hosts, and have bothria
Cyclophyllidea: terrestrial hosts (no water needed) and have acetabula
Craspedote
Front proglottid overlaps the proglottid behind it
Anapolytic
Eggs are released singularly through a pore
Apolytic
Entire gravid proglottid is released to disperse eggs
Pseudophyllidean life stages
Coracidium
Precercoid
Pleurocercoid
Coracidium
ciliated, free-living pseudophyllidean larva
Precercoid
larva in the first intermediate pseudophyllidean host (typically an arthropod)
Plerocercoid
- Larva in the second intermediate host
- Infective to humans
- Found in fish
Cyclophyllidean life stages
a. Onchosphere
b. Cysticercoid
c. Cystercus
d. Hydatid Cyst
Onchosphere
- Shelled larval form that is passed in feces
- Usually has hooks
Cysticercoid
Larval form in the intermediate host when host is an invertebrate
Cysticercus
Larval form in intermediate host when that host is a vertebrate
Hydatid Cyst
Polyembryonic larval form in a vertebrate intermediate host
Diphyllobothrium latum common name
Fish Tapeworm