Page 2 - 2.Lesson Notes-Animalia 2
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Examples: insects, scorpions, spiders, millipedes, centipedes, crabs, lobsters etc





























               Mollusca


                   •  They are bilaterally symmetrical, with a reduced coelomic cavity and little
                       segmentation.

                   •  They have an open circulatory system and kidney like organs for excretion.
                   •  Body is soft and usually enclosed in a shell. The shell may be external or
                       internal.

                   •  They show the presence of Foot, Mantle and Mantle cavity.
                   •  Muscular foot helps in locomotion.
                   •  Examples: pearl oysters, bivalves, sepia, octopus, snail, slug etc.


























               Echinodermata


                   •  They are spiny skinned and free-living.
                   •   Exclusively marine.
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