Fig. 3 A–E in Thecochaos is not a myth: study of the genus Thecochaos (Amoebozoa, Discosea) - a rediscovered group of lobose amoeba, with short SSU gene

Fig. 3 A–E Ultrastructure of Thecochaos fibrillosum. A A fragment of the amoeba cell demonstrating the stratification of the cytoplasm into the peripheral hyaloplasm and the inner granuloplasm. Numerous vacuoles and vesicles are noticeable at the periphery of the granuloplasm. B Cell coat consisting of the loose filamentous layer (distinct filaments are pointed by black arrows), covering a thick basal layer of electron-dense amorphous glycocalyx (black double arrowheads). C The peripheral area of the hyaloplasm, containing microfilamentous bundles, perpendicular to the plasma membrane (black arrowheads). Black arrows indicate cross-sections of filaments belonging to the upper layer of the glycocalyx. D An area of the granuloplasm containing dictyosomes of the Golgi complex, mitochondria with tubular cristae and dense matrix, and a single-membraned microbody. E Vacuoles containing bacteria. Abbreviations: pm, plasma membrane; hl, hyaloplasm; gr, granuloplasm; m, mitochondria; d, dictyosome of the Golgi complex; b, bacteria. Scale bars: A, 1 μm; B and C, 200 nm; D and E, 500 nm