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Lecture 45

BIOL 1010 Lecture 45: Lecture 45

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

c82 Bio 1010 Flatworms from Phylum Platyhelminthes (platys – flat, helmis – worm) are the simplest bilaterians. o Thin, ribbon-like range from in length from 1mm-20m. o Live in marine, freshwater, & damp terrestrial habitats. o Free-living forms, many are parasitic species. o Flatworms have Gastrovascular cavities with only one opening (Same as Cnidarians). Fine branches of the Gastrovascular cavity distribute food throughout the animal. 3 major groups of flatworms. Planarians (Free-living worms). FIGURE 20.7A ----------------------------------------- A planarian has a head with a pair of sensitive eye-cups & flap at each side that detects chemicals. Dense clusters of nerve cells form a simple brain, & a pair of nerve cords connects with small nerves branching throughout the body. When it feeds, it sucks food through the mouth at the tip of a muscular tube projecting from the mid-ventral surface of the body. They live on the undersurface of rocks in freshwater ponds & streams. When searching for food, they crawl using cilia on their ventral surface
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