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) Diet (ii) Process (c) Cephalization with ganglia, nerve cords & nerve nets
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