Proschkinia complanatula (Hustedt ex Simonsen) D. G. Mann

Amphora complanata Grunow 1867: 25 — Van der Werff and Huls (1975): P. D G XVI. 109; Guiry and Guiry (2025).

Navicula complanatula Hustedt ex Simonsen (1987): 479, pl. 735, figs. 1–10.

Proschkinia complanatula — Mann 1990: 675, in Round et al. (1990): 596, 597; Majewska et al. (2019); Kim et al. (2020): 10 –12, fig. 4; Plinski and Witkowski (2020): 115, 324, fig. 576.

Description

Cells solitary, usually positioned in girdle view, rectangular with rounded corners and with numerous, moderately broad bands, 9 (7–8) in 10 µm. Valves lanceolate, slightly arched, with acutely rounded apices, length 64.7 (30–58) µm, width 7.4 (5.5–8.0) µm. Raphe straight and linear with proximal ends close and distal ends strongly hooked. Transapical uniseriate striae parallel at centre, 18 (12–17) in 10 µm, becoming slightly convergent and denser near apices, 22 (17–20) in 10 µm. Central area asymmetric with striae more distant than towards the apices, producing a stauros-like structure. Fistula located in central area on primary side of valve.

Notes

iNaturalist ID: 188679253 (Fig. 30).