Figs 20–23 in On the Nature of Tintinnid Loricae (Ciliophora: Spirotricha: Tintinnina): a Histochemical, Enzymatic, EDX, and High-resolution TEM Study

Figs 20–23. Transmission electron micrographs of a lorica surface in Eutintinnus angustatus at middle resolution. 20 – a crystalline region ~ 1.5 µm in diameter is shown in the centre of the micrograph. An aggregate of bitter salt (MgSO 4) is attached to the wall (arrow); 21 – crystalline area at higher magnification showing dark spots of sodium and potassium chloride on the lorica wall; 22 – each black spot represents a NaCl or KCl nanocrystal (arrows), which has almost the same size as the unit cells of the crystal lattice (~ 20 nm); 23 – Fourier filtered high-resolution micrograph of a sodium chloride nanocrystal.