FIGURES 157–177 in Ten new Bacillariophyta species from James Ross Island and the South Shetland Islands (Maritime Antarctic Region)

FIGURES 157–177. Sellaphora gracillima sp. nov. LM and most of the SEM pictures taken from the holotype population (sample BY049) from Livingston Island (South Shetland Islands).157–174. LM views of 18 valves from the type population. 175. SEM of an entire valve, external view. 176. SEM of an entire valve, internal view. 177. SEM of an entire valve, showing the valve mantle and girdle (picture taken from Livingston Island, sample BY051). Scale bar represents 10 μm except for figs 175–177 where scale bar = 5 μm.