Abstract

Merozoites, macrogametes, and microgamonts of the coccidian parasite Goussia lacazei ( Labbé, 1895; Levine, 1983) in the intestinal cells of the centipede, Lithobius forficatus (L), were examined by transmission electron microscopy. All these stages developed within parasitophorous vacuoles and showed features characteristic of members of the Eimeriidae found in vertebrates. The merozoites possessed a trilaminate pellicle, 36 subpellicular microtubules, micropore, mitochondria, and the typical coccidian apical organization. The uninucleate macrogametes contained rough endoplasmic reticulum, lipid vesicles, and inclusions morphologically similar to eimerian wall-forming bodies of type I. The nuclei of the microgamont were located peripherally and during early microgamete development each nucleus was associated with a mitochondrion and a prominent submembrane complex of 15 microtubules.

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