Diploneis finnica (Ehr.) Cleve 1891

Dimensions: 55 x 32 µm.
Estries: radials 8 / 10 µm.
Estries doblement puntuades amb 12 - 14 punts / 10 µm.

Una característica que diferencia D. finnica de les espècies veïnes és la presencia d'obertures en la zona marginal o apical, tal com es descriu en l'article de referència:

Masahiko Idei a & Hiromu Kobayasi
THE FINE STRUCTURE OF DIPLONEIS FINNICA WITH SPECIAL REFERENCE TO THE MARGINAL OPENINGS, Diatom Research, 4:1, 25-37

“One of the peculiar features of D. finnica are square openings located in the outer wall of the alveoli (Figs 8, 10, 15, 20, 27, 28, 35 arrows, 36) though apparently similar structures are to be seen at the poles of the valve in Naviculu pygmaeu Kiitz. (Schoeman & Archibald 1980, Figs 35, 37 without comment; Krammer & Lange-Bertalot 1986, figs 65-66). These openings are usually restricted to positions close to the margin of the valve in the median and polar regions. They are also clearly visible by LM (Figs 2, 5, 6), but neithercleve (1894), Hustedt (1937) nor Patrick & Reimer (1966) referred to them. The openings in the external wall of the alveoli are square, irrespective of the presence of areolae (Figs 20, 27, 36).”