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The aim of this study was to evaluate the metabolic condition of Steatoda grossa (Theridiidae) spider, from their hemocytes, after a short-term (four-week) exposure to cadmium and copper in sublethal doses by administering them into the body of the preys. The ultrastructure of the dominant types of hemocytes, such as granulocytes, plasmatocytes and prohemocytes, was evaluated using transmission electron...