BIOMI 3310 Lecture Notes - Lecture 9: Cestoda, Amphipoda, Strobilation
Document Summary
Eucestodes general features: entirely parasitic, adults are in the host digestive tract. Eggs are passed in the feces of the final host. The final host is infected by eating a larva in an intermediate host: the neck is a germinal area behind the scolex. Source of proglottids: make up the strobila, as you move distally from the scolex, proglottids become progressively more mature. Immature: mature, gravid, anapolyitic tapeworms: gravid segments release eggs, apolytic tapeworms: gravid segments detach and pass in feces, proglottid: genital openings, used for mating. Life cycle: adults live in the body cavities of sturgeons, eggs leave the body via various connecting pores. Ciliated, 10-hooklet containing larva hatches: larva is ingested by a crustacean (amphipod) intermediate host. Larva develops into an infective juvenile: sturgeons become infected by ingesting infected amphipods. Austramphilina: monozoic (body isn"t segmented, decacanth larva (10 hooks)
