Electron-microscopic study of the nanothin spatial dissipative structures of hexagonal selenium formed in amorphous films, whose lattice undergoes elastic rotational curvature, mirror and inversion symmetries of systems of bending extinction contours present on electron-microscopic images of nanothin spatial dissipative structures are found. It has been established that the mirror and inversion symmetries of the systems of bending extinction contours present on the electron microscopic images of nanothin spatial dissipative structures are due to the mirror and inversion symmetry of the straight lattice of nanothin spatial dissipative structures of hexagonal selenium, which is experiencing an elastic rotational curvature.