Pseudogomphonema kamtchaticum (Grunow) Medlin, 1986

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 : 93

Pseudogomphonema kamtchaticum (Grunow) Medlin ( Figures 72, 73 )

Literature: (Al-Handal and Wulff 2008b, p. 430, figs. 95– 100; Medlin and Round 1986, p. 216, figs. 64–70; Witkowski et al. 2000, p. 343, pl. 60, figs. 13–16).

Description: Length 40–65 µm, width 5.5–10 µm, striae 12– 14 in 10 µm.

Remarks: Specimens observed in Potter Cove possess less dense striae than reported for this species which normally range between 16 and 23 in 10 µm ( Medlin and Round 1986; Scott and Thomas 2005). Specimens smaller than 40 µm were not observed although it might be as small as 18 µm. Ecology and distribution: This is a marine species mostly found as epiphytic and rarely on the sediment, also reported from the Arctic ( Klochkova et al. 2014). Frequent in Potter Cove.

Trachyneis aspera (Ehrenberg) Cleve ( Figure 74 ) Literature: (Cardinal et al. 1984, p. 391, figs. 98–102; Hendey 1964, p. 236, pl. 29, fig. 13; Witkowski et al. 2000, p. 355, pl. 159, figs. 1–6, 9).

Description: Length 62–104 µm, width 12–15 µm, striae 14–16 in 10 µm.

Remarks: A species with variable outline and wide size variation. Specimens observed in the present study had denser striae than normally found in this species (6–8 in

10 µm) and vary from previous observations in the same region (9–11 in 10 µm, Al-Handal and Wulff 2008b).

Ecology and distribution: A widely distributed marine littoral species. Recorded from the sub-Arctic and the Arctic (Cardinal et al. 1984; von Quillfeldt 2000). Frequent in Potter Cove.

Figures

Figures 60–78: Marine benthic diatoms in Potter Cove, King George Island, Antarctica, summer 2015. (60, 61) Cocconeis antigua. (62) Diploneis smithii. (63) Diploneis weissflogii. (64) Diploneis sp. (65) Caloneis sp. (66, 67) Navicula cancellate. (68) Navicula directa. (69, 70) Navicula perminuta. (71) Navicula sp. (72, 73) Pseudogomphonema kamtchaticum. (74) Trachyneis aspera. (75, 76) Biremis ambigua. (77) Parlibellus crucicula. (78) Pinnularia quadratarea.