Parasitism Head Louse Phylum Arthropoda Order Insecta Tapeworm

Head Louse Life Cycle: Egg (nit), Nymph (3 stages), Adult Environment: Animal Scalp Legs

Head Louse Terminal Claw Head Louse - SEM Is a head louse an ectoparasite

Tape Worm Oldest known parasite Life Cycle: egg, larvae (cyst), adult Environment: Animal Intestine

Tapeworm Body Plan: Scolex (head) Neck – cells to produce new proglottids Proglottids –

Tapeworm Scolex with 4 suckers, double row of hooks Tapeworm – 12 ft long

Other Parasites A tick adult in search of a host can live up to

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Parasitism Head Louse Phylum Arthropoda Order Insecta Tapeworm Phylum Platyhelminthes Order Cestoda

Head Louse Life Cycle: Egg (nit), Nymph (3 stages), Adult Environment: Animal Scalp Legs have a terminal claw which allows quick movement from hair to hair A Head Louse cannot survive more than a few days without a host A Ked is a winged or wingless louse fly

Head Louse

Head Louse Terminal Claw Head Louse - SEM Is a head louse an ectoparasite or an endoparasite?

Tape Worm Oldest known parasite Life Cycle: egg, larvae (cyst), adult Environment: Animal Intestine Cannot survive without a host Passed to human primarily through undercooked meat (eg. pork) Obtain nutrients by absorption Why would a tapeworm live in the intestine?

Tapeworm Body Plan: Scolex (head) Neck – cells to produce new proglottids Proglottids – segments, each has male and female reproductive structures and can reproduce independently

Tapeworm Scolex with 4 suckers, double row of hooks Tapeworm – 12 ft long Is a tapeworm an ectoparasite or an endoparasite?

Other Parasites A tick adult in search of a host can live up to 2 years without food (dog tick) Final Note: 70% of all parasites are protists

Cattle Tick