Pleurosigma eudon var. kerguelensis Heiden et Kolbe

Al-Handal, Adil Y., Torstensson, Anders & Wulff, Angela, 2022, Revisiting Potter Cove, King George Island, Antarctica, 12 years later: new observations of marine benthic diatoms, Botanica Marina (Warsaw, Poland) 65 (2), pp. 81-103 : 94-95

Pleurosigma eudon var. kerguelensis Heiden et Kolbe ( Figure 82 )

Literature: (Al-Handal and Wulff 2008b, p. 430, figs. 103, 104; Manguin 1960, p. 318, pl. 30, fig. 373; Simonsen 1992, p. 74, pl. 72, figs. 1–5).

Description: Length 190–200 µm, width 18–20 µm, transverse striae 20–22 in 10 µm.

Ecology and distribution: A marine Antarctic species. Previously reported from Potter Cove both on the sediment and as an epiphyte (Al-Handal and Wulff 2008b). Very rare in the examined material.

Pleurosigma strigosum W. Smith ( Figure 84 ) Literature: (Cardinal et al. 1986, p. 187, figs. 70, 72; Hendey 1964, p. 246, pl. 36, fig. 7; Sterrenburg 2003, p. 159, figs. 1– 4, 22–25).

Description: Length 145–260 µm, width 18–30 µm, transverse striae 20–24 in 10 µm.

Ecology and distribution: A widely distributed marine species, also found in estuaries. Previously recorded from Fuego district in south Antarctica ( Frenguelli 1943) and from the sub-Arctic (Cardinal et al. 1986). It has not previously been observed in Potter Cove but was found in large numbers in the present samples.

Figures

Figures 79–92: Marine benthic diatoms in Potter Cove, King George Island, Antarctica, summer 2015. (79) Gyrosigma arcuatum. (80) Gyrosigma fasciola. (81) Gyrosigma cf. obscurum. (82) Pleurosigma eudon var. kerguelensis. (83) Pleurosigm diversestriatum. (84) Pleurosigma strigosum. (85) Amphora gourdonii. (86) Amphora marina. (87, 88) Amphora sp. 1. (89) Amphora sp. 2. (90) Cylindrotheca closterium. (91, 92) Fragilariopsis cylindrus.