Invertebrates 2 flatworms, molluscs & annelids

Invertebrates 2 flatworms, molluscs & annelids -...

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Invertebrates -2: Platyhelminthes, Mollusca & Annelida Page 1 of 9 Flatworms (Phylum Platyhelminthes) 1. General characteristics (a) Dorso-ventrally flattened (b) Bilateral symmetry, triploblastic & acoelomate (c) Diverse habitats - Marine - Fresh water - Damp terrestrial - Parasitic 2. Turbellarians (e.g. planaria) (a) Movement (i) Use cilia (ii) Glide (iii) Swim by undulating muscles (b) Food in and wastes out of the ventral mouth ( i ) D i e
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Invertebrates -2: Platyhelminthes, Mollusca & Annelida Page 2 of 9 (d) Reproduction 3. Cestoda (Tapeworms) are parasitic (a) Absorb food from intestines & reproduce Molluscs (Phylum Mollusca) 1. General characteristics (a) Bilateral & coelomate (b) Marine, FW & terrestrial (c) Some with & some without a shell 2. Generalized body plan (Fig. 33-15) (a) Muscular foot (b) Visceral mass that contains the internal organs
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Invertebrates -2: Platyhelminthes, Mollusca & Annelida Page 3 of 9 (c) Mantle that secretes the shell & forms the mantle cavity (d) Radula (rasp-like feeding organ) (e) Circulatory system (most are open) 2. Chitins (Class Polyplacophora) (a) Dorso-ventrally flattened, ovoid shape, convex dorsal surface with 8 plates (b)
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This note was uploaded on 01/15/2011 for the course BIOL 190B taught by Professor Dr.davidcreasey during the Spring '10 term at University of Victoria.

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Invertebrates 2 flatworms, molluscs & annelids -...

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