Abstract
Some of the ultrastructural features of the in vitro destruction of the mother sporocyst of Schistosoma mansoni by amoebae ( Nuclearia sp.) isolated from the pericardial sacs of Biomphalaria glabrata are described. The interaction involves (1) the attachment of the amoeba plasma membrane to the tegumental membrane of the sporocyst, (2) penetration of the tegument by a single cell process containing only a finely granular cytoplasm, (3) the lytic destruction of the sporocyst tissues, and (4) their removal by phagocytosis. Since the amoebae retain their lysosomal complement, the mechanisms of sporocyst penetration and lysis are unknown. Myelin figures and multivesiculate and residual bodies are frequently seen in amoebal secondary lysosomes. Cell organelles and body components of the sporocysts are phagocytosed by amoebae attached to their surfaces, located inside the body or elsewhere in the vicinity of the disintegrating sporocyst.
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