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42 Cards in this Set

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Flatworms
Phylum Platyhelminthes
Two Sided,right and left, only can be divided equally by one plane(cut in half). Flatworms are arranged this way.
Bilateral Symmetry
Concentration of newons tissues at the anterior end, BRAIN
CEPHALIZATION
Without a body cavity
Acoelomate
Dorsal
Top
Ventral
Bottom
Anterior
Front
Posterior
REAR
Three Classes
Turbellaria
Trematoda
Cestoda
Trematoda
Parasitic flukes
Endoparasites
Lives inside host
Tegument
Thick layer of cells to protect them from being digested
Ectoparasites
Lives on the outside of their hosts
Turbellaria
Free living, mostly marine,freshwater, most common is the Planeria. Lives under rocks in streams and ponds.
Asexual
In the summer they sttach their posterior ends and strech and tear in two. Have almost total regeneration
Sexual
Hermaphodites, cross fertilization
Degeneration
Lost certain characteristics of their ancestors, backwards evolution.
Trematoda
No digestive system, sucker used to attach to their host, no sense organs, no movement. Known as flukes. All parasitic. Asian liver fluke, sheep liver fluke
Schistosoma
blood flukes, passes through the skin from the water, kills 800,000 per year, infects 200 million in tropical regions.
Clonorchis sinesis
human liver fluke, get it by eating infected fish
Cestoda
Parasitic TAPEWORMS, Adult stage permentaly attach to intestinal wall of host, no digestive system
digestion
absorbs food from the host's intestine directly through their skin
Proglottids
Rest of teh tapeworm- rectangular body sections masses of reproductive organs, oldest at posterior ends
scolex
Head of tapeworm.knob shaped head with hooks and/or suckers
Cysts
larval tapeworms inside the meat, kill them by cooking
Phylum Rynchocoela
Free living Marine worms
Length 1-100 ft
have a circulatory system and a digest tube that is open on both ends
Phylum Nematoda
Unsegmented roundworms
Pseudocelom
Free Living
Parasites
PSEUDOCOELOM
False Cavity, cavity between middle layer and inner layer
FREE LIVING
Most Roundworms
PARASITES
About 50 species parasitize plants and animals
ASCARIS
Infects human intestines, eggs carried to soil in human waste, eggs can live for years
NEMATODA EGGS Devlop Where?
In the intestines and bore through the walls into blood vessels where they enter the blood and travel to the lungs
How do the worms return to th eintestine to mate?
Animal coughs them up and then swallows them, they mate, and their eggs pass out in waste.
Necator
Hookworms, bores through bare feet
Trichinella
Parasitic roundworms in pigs that causes trichinosis in humans. Cooking/freezing kills it.
PHYLUM ROTIFERA
Have a row a cilia around the mouth
feed on bacteria and protists
and are well developed one way gut.
Flatworms have these systems
Distinct centralized nrevous system, simple excretory system, and a complex reproductive system, a prmitive intestine (one opening for food and waste)
What can Flatworms do to humans?
Flatworms can cause misery and early death.
Pork Tape Worm attaches to it host by what?
4 suckers and a row of hooks
Beef Tapeworms attach to its host by what?
4 suckers
Fish Tapeworm attaches to it's hosts by what?
two groovelike attachment organs. NO hooks or suckers.
Dog Tapeworm attaches to it's hosts by what?
4 suckers, lots of hooks.