The Eukaryotes 12d: Animals
Post on 19-Jan-2016
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The Eukaryotes 12d: Animals
Helminths & Arthropods
Helminths
reduced or no digestive system
reduced nervous system
no or reduced locomotion
life cycle is usually complex
For the CDC versions of parasite life cycles
http://www.dpd.cdc.gov/dpdx/Default.htm
Phylum Platyhelminthes = flat worms
Class Cestoda = tapeworms
2 body parts
hermaphroditic
23.13
Taenia saginata = beef tapeworm
T. solium = pig tapeworm
Def. host
cysticercus (immature form in muscle)
“dead-end host”
23.14
Echinococcus granulosus
Diphyllobothrium latum = broad fish tapeworm
Def. host
Phylum Platyhelminthes = flat worms
Class Trematoda = flukes
snails are usually the intermediate hosts
usually hermaphroditic except schistosomes
23.16
Schistosoma = blood fluke
Infects >200 million people/year
2 sexes
23.17
Swimmer’s itch
Cercaria in skin
Fasciola = sheep liver fluke(Dhost: sheep & other grazing animals; humans are “accidental”)
hermaphroditic
23.17
Phylum Nematoda
hookworms: Necator & Ancylostoma
Ascaris
Enterobius vermicularis = pinworm
Trichinella
microfilariae
Wucheria
Dracunculus medinensis = guinea worm
Anisakine worms: Anisakis & others
(~2 cm long)
Def. host
Phylum: Annelida (segmented worms)
Class: Hirudinae (leeches)
Hirudo medicinalisleech jar
FDA approved
Arthropod vectors 23.24
Arachnids
Insects
Sarcopti scabiei = scabies, mange
Can be STI
Considered “diseases”
Lice:
Pediculus spp.
Phthirus pubis = crab/pubic louse
Pediculus capitis
Maggot therapy - for treating non-healing wounds.
Blowflies (Calliphoridae)
usual species: Phaenicia sericata (green blowfly)
(FDA approved)
1. They clean the wounds by dissolving dead
and infected tissue ("debridement");
2. They disinfect the wound (kill bacteria);
3. They speed the rate of healing.
For more info:http://www.medicaledu.com/maggots.htm#Current status of maggot therapy
(maggot)
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