Figs 35–40.

Maryna umbrellata, TEM micrographs of UL-stained cyst sections. 35 – cyst periphery of a section treated with hydrofluoric acid. The glass granules solved and are thus electron lucent. Maryna umbrellata has a very thick pericyst and mesocyst, while ectocyst and endocyst are less than 1 μm thick; 36, 38–40 – details of the dense, structureless ectocyst (36, 38) and the pericyst. The latter consists of the mucous cover embedding the glass granules (36) and the basal layer, which is composed of interwined tubules with a diameter of about 20 nm (36, 39, 40, arrows); 37 – high magnification of cyst wall. Note the thin, electron-dense ectocyst, the laminated mesocyst, and the narrow space between mesocyst and endocyst (asterisk). BL – basal layer, C – ciliate cortex, E – endocyst, EC – ectocyst, G – glass granules, L – lipid droplets, M – mesocyst, MC – mucous cover, MT – mitochondria, P – pericyst, SG – spongy globules, W – cyst wall. Scale bars: 200 nm (Figs 38–40), 400 nm (36), and 4 μm (35, 37).