Platyhelminthes - Platyhelminthes Monday Neat Features to...

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Platyhelminthes Monday, June 13, 2011
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Neat Features to Look Out for: Bilaterally symmetrical Anterior cephalization (concentration of sense organs around a ‘head’) Triploblastic cell layers Acoelomate/pseudocoelomate condition Incomplete digestive tract (food and waste are expelled from the same opening) Flame cells Monday, June 13, 2011
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Digestion: ~extracellular digestion & phagocytosis ~Incomplete digestive system or intestine, which much absorb all nutrients as small molecules ~flame cells for water balance ~diffusion ~excretion through the protonephridia Monday, June 13, 2011
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Classes: Tubellaria Free-living flatworms (few are symbiotic) Trematoda Parasitic flukes with complex life cycles Monogenea Parasitic flukes with simple life cycles Cestoda Parasitic tapeworms Monday, June 13, 2011
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Nervous System: Subepidermal nerve plexus Longitudinal nerve cords Basic sensory organs such as auricles and ocelli Reproduction: Both asexually and sexually Most are monoecious (hermaphroditic) (think penis fencing!!) Monday, June 13, 2011
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Pics Monday, June 13, 2011
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Monday, June 13, 2011
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