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Life   Platyhelminthes


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Bedfords Flatworm, Pseudobiceros bedfordi
© Copyright GNU Free Documentation License · 0
Bedfords Flatworm, Pseudobiceros bedfordi
Flatworm cleared and stained
© The University of Auckland, 2003-2007 · 0
Flatworm cleared and stained
Pseudobiceros hymanae, dorsal view
© Copyright Marian K. Litvaitis, University of New Hampshire, 2005-2007 · 1
Pseudobiceros hymanae, dorsal view
Pseudobiceros hymanae, ventral view
© Copyright Marian K. Litvaitis, University of New Hampshire, 2005-2007 · 1
Pseudobiceros hymanae, ventral view

Pseudoceros pardalis, live animal
© Copyright Marian K. Litvaitis, University of New Hampshire, 2005-2007 · 2
Pseudoceros pardalis, live animal
Platyhelminthes consists of the unsegmented flatworms, which includes both free-living and parasitic species. They have bilateral symmetry, and can move by using layers of muscles, or in some species, by gliding along a slime trail using cilia. Flatworms are slightly less developed than segmented worms due to their lack of a circulatory system and complete digestive system. Instead, flatworms absorb nutrients through their skin and excrete wastes using specialized "flame cells." Some flatworms have primitive light-sensing "eyes" that allow them to move either towards or away from light, while other species have different types of sensors on their bodies, including chemical, balance, and water movement receptors. Most species of flatworms reproduce either sexually or asexually.



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