Identification of structural features of higher crustaceans, based on species Rhithropanopeus harrisii tridentatus offers the possibility of determining the specifics changes of vital structures over time, depending on the environmental changes. In this study were investigated five individuals of the species Rh. harrisii. The selected objects were dehydrated, placed in paraffin blocks, sectioned and subsequently stained by azan-Heidenhain method.