Ultrastructure of the Ameboid Cells of Protostelium zonatum (Mycetozoa)*

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Abstract
SYNOPSIS. The ameboid cells of Protostelium zonatum typically have filose pseudopodia that contain almost exclusively microfibers. Microfibers, scattered or arranged parallel in bundles, are observed in great abundance and often closely associated or directly connected with other organelles in the cytoplasm. Mitochondria typically have an expanded, undulate outer membrane and vesicular cristae containing electron‐dense material which may appear denser than the mitochondrial matrix in the same section. The nucleus, as in other protostelids, contains only one centrally located nucleolus. Other organelles are essentially similar in ultrastructure to those of another nonflagellate protostelid, Protosteliopsis fimicola. Protostelium zonatum differs, however, in lacking a distinct anterior zone of hyaloplasm during migration of the ameboid cells.