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 Entopyla ocellata (Arnott) Grunow ( Figures 37, 38 , 109– 111 ) References: (Al-Handal and Wulff 2008b, p. 427, figs. 57– 62, 65; Desikachary 1988 , p. 11, pl. 584, figs. 10, 11). Description: Length 48–75 µm, width 10–16 µm, striae 4–6 in 10 µm. Remarks: This species is characterized by having large and wide apical pore fields occupying two thirds of the concave valve face ( Figures 109, 110 ). A very narrow sternum (not visible under LM) runs from pole to pole. Two rimoportula open externally as small, elongated openings located centrally under each pore field and internally as large crescent-like openings located transversely with short stalks ( Figure 111 ) which are very characteristic for this species. Figures 39 – 59: Marine benthic diatoms in Potter Cove, King George Island, Antarctica, summer 2015. (39) Lyrella hennedyi . (40) Petroneis sp. (41) Petroneis plagiostoma . (42) Staurophora sp. (43–46) Achnanthes cf. groenlandica , (43, 44) raphe valve, (45) sternum valve, (46) two cells in girdle view. (47) Cocconeis californica . (48) Cocconeis californica var. kerguelensis . (49) Cocconeis costata var. hexagona . (50) Cocconeis dallmannii . (51) Cocconeis fasciolata . (52) Cocconeis imperatrix . (53) Cocconeis matsii . (54, 55) Cocconeis melchioroides . (56–59) Cocconeis orbicularis , (56, 59) sternum valve, (57, 58) raphe valve. Ecology and distribution: A marine epiphytic or benthic species. Widely distributed as epiphyte in King George Island (Al-Handal and Wulff 2008b). Frequent in the present material.