Abstract
The objective of this work was to characterize, and compare different morphological types of hemocytes of Rhodnius prolixus, Rhodnius robustus, Rhodnius neglectus, Triatoma infestans, Panstrongylus megistus, and Dipetalogaster maximus. This information provides the basis for studying the cellular immune systems of these insects. Seven morphological hemocyte types were identified by phase-contrast microscopy: prohemocytes, plasmatocytes, granular cells, cystocytes, oenocytoids, adipohemocytes and giant cells. All seven types of hemocytes are not present in every species. For example, adipohemocytes and oenocytoids were not observed in P. megistus and P. infestans, and giant cells were rarely found in any of the species studied. The hemocytes of Rhodnius and Dipetalogaster are more similar to each other than those from Triatoma and Panstronglus which in turn closely resemble each other. Emphasis is placed on methodological problems arising in this work which are discussed in detail.
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