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Published byElmer Baldwin Modified over 9 years ago
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WORMS! Ch. 10, 11, 12
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Phylum Platyhelminthes ~34,000 Species Symmetry: Bilateral Body Cavity: Acoelomate Body Structures: – Triploblastic – True mesoderm – Unsegmented worms Scolex of a tapeworm
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Phylum Platyhelminthes New Advancements (over cnidarians) – Regeneration – Protonepheridia - “First-Kidney” Networks of tubes leading to a nephridiopore, where excretions are released – True mesoderm - triploblastic organisms – Organ Systems
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Phylum Platyhelminthes Common Members: – Planaria - free swimming bottom dwellers – Liver Fluke - ectoparasites (attach to aquatic organisms -ex amphibians) – Tapeworm - no digestive tract
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Phylum Platyhelminthes Special features: – Muscles – Cilia – Pharynx – used to suck up food – Photoreceptors Parasitic or Free living – Parasitic: Flukes & tapeworms – Free living: Planarians (Tubellarians) Reproduction: – Sexual & Asexual – Most monoecious
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Phylum Platyhelminthes Nervous System: pair of anterior ganglion, long longitudinal nerve cords. Digestion: Incomplete gut, pharynx
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