Abstract
Insect haemocytes belong to different categories that carry out various immune functions in larvae and adults. Survey of their studies in different orders of insects would help and suggest that discrepancy in their nomenclature is based on the individual description of their shapes and metabolic contents and the same would be resolved by putting up their characteristics and features together to name different types of haemocytes consistently. Basically, there are three basic forms, prohaemocytes, plasmatocytes and granular haemocytes forming the bulk of the population. Other three types are spherulocytes or cystocytes, oenocytoids and adipohaemocytes. Plasmatocytes and granular haemocytes are functionally termed as immunocytes.