Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry. Phylum: Arthropoda Phylum : Mollusca.

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Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry. Phylum: Arthropoda Phylum : Mollusca Phylum: Echinodermata

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry. These are triploblastic,bilaterally symetrical, metamerically segmented animals Body is covered by a thick chitinous cuticle forming an exoskeleton. Body segments have jointed legs. Distinct cephalization. The Head has a pair of compound eyes. Each compound eye is made up of Several sub-units called Ommatidia

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry. Presence of open circulatory system The Body cavity is filled with blood. It is called Haemocoel. They exhibit sexual dimorphism.

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry. CRUSTACEA MYRIOPODA INSECTA ARACHINIDA ONYCHOPHORA PRAWN CENTIPEDE COCKROACH SPIDER PERIPATUS

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry.

LOBSTER

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry.

COCKROACH

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry.

PERIPATUS

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry. MOLLUSCA These are soft bodied animals without segmentation. The body is divided into head, muscular foot and visceral mass. The body is covered by a mantle and a shell. Respiration is effected by gills.

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry. GASTROPODA PELECYPODA CEPHALOPODA PILA GLOBOSA MUSSLES SEPIA

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry.

ECHINODERMATA They are Marine organism. The Adults are radially symmetrical but the larva shows bilateral symmetrical. Presence of water vascular system. Locomotion is effected by tube feet. The body surface has several spines.

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry.

BRITTLE STAR

Prepared by T. Madhavan & K. Chandrasekaran, Lecturers in Zoology, Directorate of School Education., Pondicherry.