Circulating Haemocytes in Insects: Phylogenic Review of Their Types

........................................................................................................................................................... 1743 Introduction ...................................................................................................................................................... 1743 Types of haemocytes in major orders of insects ................................................................................................. 1744 Thysanura ............................................................................................................................................... 1744 Orthoptera .............................................................................................................................................. 1744 Dictyoptera ............................................................................................................................................. 1744 Phasmida ................................................................................................................................................ 1744 Dermaptera.............................................................................................................................................. 1745 Mallophaga.............................................................................................................................................. 1745 Hemiptera ............................................................................................................................................... 1745 Lepidoptera ............................................................................................................................................ 1745 Diptera .................................................................................................................................................... 1746 Coleoptera .............................................................................................................................................. 1746 Hymenoptera ........................................................................................................................................... 1747 Conclusion ....................................................................................................................................................... 1747 References........................................................................................................................................................ 1747 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.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.