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. 2024 Jan 11;27(2):108865. doi: 10.1016/j.isci.2024.108865

Figure 1.

Figure 1

Morphology of the microfossil Polysphaeroides filiformis and of modern cyanobacteria and a modern red alga

Microphotographs of Polysphaeroides filiformis (A and B), Stigonema robustum CBFS-A027 (C), Stigonema informe CBFS-A033 (D) and Bangiopsis franklynottii CCMP3416 (E and F).

(A) black arrows show ICIs within fossil cells.

(B) True T-type branching of the filament.

(C and F) True T-type branching is visible for all the species.

(E) Unbranched filament of B. franklinottii also showing the two types of cells: spherical or flat cells. (Scale bars: A, D, and E = 50 μm; B, C, and F = 100 μm).