Structure and secretion of the carapace in some living ostracodes

Abstract

The carapaces of some living freshwater and brackish-water ostracode species have been studied by means of light microscope, scanning electron microscope. transmission electron microscope, electron probe analyzer and X-ray diffractometer, with emphasis placed on the ‘pigment’ granules. The granules were found to consist of calcite and apatitic calcium orthophosphate. They are located within the epidermis, as a layer which is attached to the internal side of the calcite layer. It is suggested that the main function of the granules is the construction of the new calcareous valve in the moulting process. The layer of granules probably recrystallizes to form the calcite crystals of the valves.