Table S1. Measurements of choanocyte chamber diameter. from Three-dimensionally preserved soft-tissues and calcareous hexactins in a Silurian sponge: implications for early sponge evolution

Measurements of 71 different sediment-filled soft-tissue chambers (interpreted as choanocyte chambers) from physical-optical tomograms of OUMNH C.36032. Heights and widths measured in pixels (px) and converted to microns (µm); tomogram resolution was 105 pixels/mm. Mean diameter (i.e. mean of all heights and widths) 82.0 µm, standard deviation 17.5 µm, range 48-133 µm.