Revisiting Potter Cove, King George Island, Antarctica, 12 years later: new observations of marine benthic diatoms Author Al-Handal, Adil Y. Author Torstensson, Anders Author Wulff, Angela text Botanica Marina 2022 Warsaw, Poland 2022-02-23 65 2 81 103 http://dx.doi.org/10.1515/bot-2021-0066 journal article 297141 10.1515/bot-2021-0066 163e2ba5-fdc5-4fbf-916e-311eb7062dd4 1437-4323 11000147 Porosira glacialis (Grunow) Jørgensen ( Figures 2–4 , 107, 108 ) Literature: ( Hendey 1964 , p. 88, pl. 1, fig. 12; Scott and Thomas 2005, p. 84, fig. 2.41a–f). Description: Diameter 54–72 µm. Remarks: Valve areole very fine, either arranged in fascicules or irregularly scattered, sometimes indistinct. Valve surface with scattered spines. A single labiate process located below valve margin and visible in LM. Ecology and distribution: This is a marine neritic species widely distributed in both the Arctic and Antarctica (bipolar), normally associated with sea-ice flora. It is also known from temperate waters ( Pike et al. 2009 ). According to Armand et al. (2005), P. glacialis is found on the sediment only as resting spores. In our material, all specimens were vegetative cells that might have been deposited from the plankton. Frequent in Potter Cove.