Ultrastructures of the microfossil Qingjiangonema cambria. (IMAGE)
Caption
(a, b) SEM images of a Q. cambria on the macrofossil in Fig. 2a, indicating FIB milling positions of longitudinal and cross sections, respectively. (c) STEM-HAADF image of the ultrathin cross section in (b), showing microcrystals tightly packed within a thin envelope. (d) STEM-HAADF image of the ultrathin longitudinal section in (a), showing that neighboring cells are disconnected with intercellular boundaries, note that microcrystals are much smaller in the smaller cell than those in the larger neighboring cells. (e) Close-up of the boxed area in (c), showing the ultra-thin, multilayered film comparable to the typical cell envelope of Gram-negative bacteria, which comprises a cytoplasmic membrane (CM), a periplasmic space (PS) and an outer membrane (OM).
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