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Download Phylum Platyhelminthes Flatworms
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Phylum Ctenophore The comb jellies Less than 100 species Radial symmetry 8 rows of ciliary combs, that beat in waves October 31st, 2014 Phylum Platyhelminthes Flatworms Flatworms -20,000 species -flattened -bilaterally symmetry -central nervous system with simple brain -organ and organ system -some free-living -some parasitic—live in or on other organisms and harm them (flukes and tapeworms) planaria Flatworms Flatworms Flatworms Internal parasites Flatworms scolex tapeworms Worm body Phylum Nemertea Ribbon worms • Look like long flatworms but more complex • Complete digestive tract • Circulatory system • Proboscis –long fleshy tube used to entangle prey. • 900 species-mostly marine. • In all oceans, mostly shallow temperate waters Ribbon worms Phylum Nematoda • Rarely seen-25,000 sp. • Some parasitic, some not • Small, cylindrical bodies, pointed at both ends • Live in sediments, eat bacteria Roundworms Phylum Annelida Phylum Annelida Segmented worms Phylum Annelida Examples: polychaete worms, earthworm Bilateral symmetry Advanced marine worms Closed circulatory system Organ organization Larger ones have gills More advanced muscles system Segmented bodies Often live in tubes of mucus, protein, seaweed, mud, sand, shells 20,000 species Symmetry Bilateral Radial Segmented worms Annelida Segments: a series of compartments Parapodia: each segment has flattened extensions Setea: stiff hair-like projections. Project from parapodia and are connected to internal muslces. Allow for contractions and movement. Annelida Annelida Annelida Annelida Annelida
