Thecamoeba striata Penard, 1890

Thecamoeba striata 1-5 and 9-11: locomotive; 6: cell, changing the direction of movement; 7: cell in "non-directed" movement; 8: nucleus (stained preparation).
Scale bar: 20 mkm; 8: 10 mkm

Thecamoeba striata 1: nucleus; 2: nuclear lamina; 3: cell surface; 4-5,8: mitochondria; 6-7: channells in the cytoplasm; 9: dictyosome; 10: bacterial claster in the cytoplasm.
Scale bar: 500nm; 3: 250 nm;

  • Locomotive form flattened, elongate, with rounded anterior end and hyaloplasm in deep antero-lateral crescent. No differentiated uroid. Moving cell usually has 3-5 dorsal ridges. Length in locomotion about 52-92 mkm (average 63-81 mkm), breadth 28-60 mkm (average 35-45 mkm), L/B 1.4-2.0. Floating form rounded, without pronounced pseudopodia.
  • Single elongate nucleus, about 10-12 mkm in length, with 3-7 peripheral endosomes. One contractile vacuole. No cristals in the cytoplasm. No cysts found.
  • Hexagonal nuclear lamina, about 85 nm in thickness. Cell coat amorphous, about 20 nm in thickness. Mitochondria with dark matrix, some proces resembling the secretion of vesicles by mitochondria is known. Dictyosomes are not numerous, consist of 5-8 cisternae.

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