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Platyhelminthes_2008_1_

Platyhelminthes_2008_1_ - Radiata Metazoa Ancestral...

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Porifera Cnidaria Ctenophora Phoronida Ectoprocta Brachiopoda Echinodermata Chordata Platyhelminthes Mollusca Annelida Arthropoda Rotifera Nemertea Nematoda Radiata Deuterostomia Protostomia Bilateria Eumetazoa Metazoa Ancestral colonial flagellate Phylum:  Platyhelminthes
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Kingdom: Animalia Phylum:  Platyhelminthes Class:   Turbellaria Class:   Trematoda Class:  Cestoda free-living planaria  parasitic tapeworms parasitic flukes
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flatworms most primitive animal that has/is... bilateral symmetry dorsal/ventral; anterior/posterior; left/right triploblastic endoderm- digestive system ectoderm- outer covering, nervous system mesoderm- muscle, excretory, reproductive  systems true organs tissue  level of organization  believed to be first animal that could hunt for food; aided  by bilateral symmetry and paired sense organs at the head acoelemate no body cavity (i.e. “solid body”) only internal cavity is the gut Phylum:  Platyhelminthes
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acoelemate no body cavity (i.e. “solid body”) only internal cavity is the gut Phylum:  Platyhelminthes
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Body Plans Are Basic Structural  Designs radial or bilateral symmetry.  Radially symmetrical animals move slowly, if  at all.  bilateral symmetry have more rapid  movements and sensory organs
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Simple Lophotrochozoans Flatworms have  no body cavity lack organs for oxygen transport have one gut entrance move via cilia.  Many species are parasitic
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no organized circulatory or respiratory systems thin,flat bodies allow diffusion of nutrients and gases centralized nervous system (cephalization) brain and sensory organs at head 2 nerve cords run length of body digestive system free-living planaria has branched one; single opening parasitic tapeworm has none reproductive system sexual- hermaphrodites both testes and ovaries, uterus in mesoderm  layer cross- or self-fertilization
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