jpy12121-sup-0001-FigS1.tifimage/tif746KFigure S1. Shape of annulus in Chaetoceros socialis (a–e) and C. gelidus sp. nov. (f–h). All scale bars indicate 1 μm.
jpy12121-sup-0002-FigS2.tifimage/tif3653KFigure S2. Chaetoceros socialis, mixed sample from Thailand, showing two types of setae in the same chain of cells: (a) sibling cells with four short setae, (b) sibling cells with three short and one long seta. SEM.
jpy12121-sup-0003-FigS3.docxWord document51KFigure S3. Graph showing length of apical axis, pervalvar axis, pervalvar axis with basal parts, and window size in CCMP 172, Chaetoceros socialis and C. gelidus sp. nov. Each box plot shows the median, the 25 and 75 percentiles (box) and the 10 and 90 percentiles (error bar). Please note that for window size, the y-axis is shown to the right. For the other characters, the y-axis is shown to the left.
jpy12121-sup-0004-FigS4.tifimage/tif2244KFigure S4. (a) The original drawing of Chaetoceros socialis by Lauder (1864). (b) The original drawing of C. radians by Schütt (1895). (c) Drawings of resting spores of C. socialis var. socialis (4-7) and C. socialis f. radians (12-15) by Proschkina-Lavrenko (1963).
jpy12121-sup-0005-TableS1.docxWord document17KTable S1. List of cultures of Chaetoceros socialis, C gelidus sp. nov. and outgroup taxa established in this study, with strain designation, location, and date of sampling.
jpy12121-sup-0006-TableS2.docxWord document20KTable S2. Morphometric data of Chaetoceros gelidus sp. nov. and C. socialis. All measurements were based on 20 cells. The values indicate mean ± SD, with minimum and maximum values in brackets.

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