The fine structure of sporogony in Myxidium zealandicum (Protozoa: Myxosporidia)

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Abstract
Studies of the ultrastructure of the trophozoite (plasmodium) and the process of sporogony and polar capsule development of M. zealandicum from gill and kidney of the North American eel Anguilla rostrata are described. Although the basic steps and characteristics of sporogony are similar to those previously reported for other myxosporidians, 3 new and significant observtions are reported: the identification of a uninucleate germ cell for the binucleate sporocyst; the asynchronous maturation of polar capsules within a single sporocyst; and the existence of a mitochondrial layer at the periphery of the plasmodium that may have a transport function. Cylindrical and spherical structures, either of which might be the primordium of the polar capsule, were observed but the problem was not resolved. Observations are discussed with reference to previous descriptions of myxosporidians.

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