Thecamoeba quadrilineata Carter, 1865

Thecamoeba quadrilineata 1-3 and 9-11: locomotive; form; 4: cell, changing the direction of movement; 5-6: cell in "non-directed" movement; 7-8: nucleus (stained preparation); 12: dorsal ridges in locomotive form.
Scale bar: 20 mkm; 7-8: 10 mkm

Thecamoeba quadrilineata 1-2: nucleus; 3: fine filaments contacting with the nuclear envelope; 4-5: mitochondria; 6: dictyosome; 7-8: bacteria in the cytoplasm; 9:contractile vacuole; 10: cell surface
Scale bar: 500nm; 10: 250 nm;

  • Locomotive form flattened, elongate, with rounded anterior end and hyaloplasm in deep antero-lateral crescent. No differentiated uroid. Moving cell usually has several parallel longitudial dorsal ridges. Length in locomotion 41-75 mkm (average 58 mkm), breadth 20-41 mkm (average 27 mkm), L/B 2.0. Floating form rounded, without pronounced pseudopodia.
  • Single elongate vesicular nucleus, about 9 mkm in diameter, with endosome about 6 mkm in diameter. One contractile vacuole. No cristals in the cytoplasm. No cysts found.
  • Nucleus with central compact nucleolus. No inner nuclear lamina. Cell coat amorphous, about 25 nm in thickness. Mitochondria with dark matrix, some proces resembling the secretion of vesicles by mitochondria is known. Dictyosomes are not numerous, consist of 4-10 cisternae.

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