The morphology of spider Argiope anasuja (Thorell 1887) has been described by many authors. Its distribution is from India, Pakistan to Maldives. In the present study the sexual dimorphism, morphometry, structure of female epigynum and male pedipalp has been described. The morphometric analysis revealed that females are four times larger than males. This sexual size dimorphism has evolved due to differences in adult life style and also selection, which focuses on early maturity, as explained and quoted by many researchers.