Prestauroneis crucicula (W. Smith) Genkal et Yarushina

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

Prestauroneis crucicula (W. Smith) Genkal et Yarushina ( Figure 77 )

Literature: ( Genkal and Yarushina 2017, p. 355, figs. 1a–d, 2a–d; Witkowski et al. 2000, p. 321, pl. 103, figs. 11–13).

Description: Length 71–94 µm, width 18–26 µm, striae 20– 24 in 10 µm.

Remarks: Some valves of P. crucicula may look similar to P. delognei (Van Heurck) Cox even with the arrangement of striae in the center but can be distinguished by the position of raphe distal endings where in P. delognei they clearly terminate below valve apices. All observed specimens had striae denser than normally found (14–18 in 10 µm).

Ecology and distribution: A marine and brackish-water species. Previously found in Potter Cove as an epiphyte but was rather rare. Frequent in the material examined.

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.