COMPARATIVE BLOOD CELL MORPHOLOGY IN THE PERIPHERAL BLOOD FILMS FROM DIFFERENT VERTEBRATE CLASSESS WITH AN ADAPTATION AND EVOLUTIONARY APPROACH

Haematological investigation is an important part of animal wellbeing evaluation in order to evaluate the normality of blood of an individual and to understand any shift from this normality. Through examination of blood films, as an important component of haematological investigation, we can provide useful information on erythroid, leukocytic and platelet/thrombocytic alterations. Interpretation of these alterations in different groups of vertebrates (fishes, amphibians, reptiles, birds and mammals), in contest of long-term adaptations, also helps us to highlight a possible evolutionary line from fishes to birds and mammals. Our findings show that the components of pheripherical blood analysis are similar for any species of vertebrates. So there are five basic leukocytes in all species: neutrophil (mammals) or herterophil (nonmammals), eosinophil, basophil, lymphocyte and monocyte.