Figure 1

a-b - TEM of mature spores of Desmozoon lepeophtherii n. gen., n. sp. Sagittal section of spores detailing seven coils of an isofilar polar filament (white arrows) in a double coil arrangement. The polar filament has an electron dense core and is composed of concentric layers of varying electron densities (inset a). A thick electron lucent endospore wall (black asterisks) is surrounded by a thinner electron dense exospore layer (black arrows). The single nucleus (n), posterior vacuole (pv) and polaroplast (pp) are all prominent features of the mature spore. The polaroplast is located at the anterior end of the spore and accommodates the manubroid part of the polar filament (white asterisk) and the attachment disc. Scale bars 1 μm (200 nm inset a).