Phylum Arthropoda( Jointed Legs) –

– Largest phylum.

– Bilateral symmetry, Triploblastic, segmented coelomate.

– Body  – Head, Thorax and Abdomen(three parts).

– Respiration by gills, book lungs and trachea.

– Blood without haemoglobin and circulatory system open.

– Excretion by malpighian tubules.

– Fertilisation internal – development direct or indirect 


– eg. Cockroach, Apis, Anopheles etc.


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