Staurosirella leptostauron (Ehrenb.) D.M.Williams & Round, LM and SEM micrographs taken from Grunow’s Moosach sample (BR-4819, Moosach, Germany). A. Published images in Ehrenberg (1854: figs 35–36) after original drawing from C.G. Ehrenberg in BHUPM 2347. B. LM picture of three connected frustules in girdle view. B–L. LM pictures of valves in valve face view in decreasing length. M. SEM external view of two connected frustules in girdle view. N. SEM view of the valvocopula connected to the girdle showing the fimbriate extensions. Scale bar = 10 µm.