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Earliest metazoan group to have 3 germ layers
Exhibit spiral cleavage
"holoblastic cleavage that is typical of protostomes and that is characterized"
Through body wall by diffusion
Majority have protonephridia - flame cells
Nucleus
Excretory canal
Bundle of cillia
Cytoplasm
Nephridial duct
Excretory Pore
Excretory Panal
Flame Cell
Turbellaria
Cestoda
Trematoda
Monogenea
Rhabdocoela
Tricladida
Polycladida
Rhabdocoela
Tricladida
Polycladida
Sac like gut
Most free-living
Some symbiotic
Rhabdocoela
Tricladida
Polycladida
Rhabdocoela
Tricladida
Polycladida
Hypodermic insemination
Penis fencing
Müller's larvae
Philinopsis gardineri-
I'm a nasty tasting slug!
Pseudoceros sapphirinus-
I'm a tasty flatworm
We both taste baaaaaaaaaad!
nom nom nom... earthworms
Majority are members of subclass Eucestoda (Tapeworms)
All parasitic
All hermaphroditic
Indirect development
Majority are members of subclass Eucestoda (Tapeworms)
Head - Scolex
Head cups - Bothria
Majority are members of subclass Eucestoda (Tapeworms)
Proglottids - body segemts
Strobila - all proglottids
Schistosomiasis
Affected about 252 million people worldwide in 2015
Fasciola hepatica- Sheep Liver fluke
Ectoparasites
Direct development
Haptor - attachment