Abstract
Since the pioneer work of Swammerdam (1737), who described the haemocytes of Pediculus humanus, the blood cells of insects have been the subject of numerous investigations. Until recently, haemocyte classifications were mainly based on the morphology and staining capacities of these cells as observed under light microscopy (Wigglesworth, 1959). Several papers were published and discrepancies in haemocyte classification are obvious. For example, the same haemocyte type may be labelled differently in various insect species or even in the same species, depending on the author of the investigations. Similarly, the same name has been used to identify two (or more) different types of blood cells. This situation gave rise to much confusion among insect haematologists regarding the identification of haemocyte types and considerable disagreement as to the number of blood cell types present in various insect species.
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