Fig. 6
From: Spiculogenesis and biomineralization in early sponge animals
Relative organic proportion in fossil and extant sponge spicules. a Plot of organic proportion measurements of fossil and extant sponge spicules. Organic proportion of sponge spicules was estimated as the relative thickness of combined organic structures (including axial filament, organic layer, and outer sheath) in spicules. When axial filaments are not preserved, axial canals were measured as a maximum estimates of axial filament size. Data based on axial filament measurements are plotted with box and whiskers, where box represents 25–75th percentiles, bar within box represents 50th precentile, and whiskers represent 1.5 × IQR (interquartile range) extensions from the box up to minimum and maximum measurements, with outliers plotted beyond whiskers. See Supplementary Data 1 and 2 for data. b Mean and 95% confidence interval calculated from a subsampling analysis with data binned by geological periods and subsampled 10,000 times, each with six organic proportion measurements (i.e., fewest measurements in any bin). Cm Cambrian, O Ordovician, S Silurian, D Devonian, C Carboniferous, P Permian, TR Triassic, J Jurassic, K Cretaceous, Pg Paleogene, N Neogene, Q Quaternary and extant. Source data are provided as a Source Data file
