Hasle, Syvertsen & Medlin (1994: 251, figs 1–12, 17–21, 24–26, 31–38, 45–47, 142a)
Hasle & Syvertsen (1997: 247)
Cells in stellate colonies; apical axis 38–137 µm; transapical axis 2.5–3 µm. Valves linear to lanceolate with rostrate ends. Transapical striae parallel to slightly radiating, 35–40 in 10 µm. Areolae poroid, 50–70 in 10 µm. Each valve end with an apical field of 4–6 longitudinal slits through the valve wall. Labiate process solitary, close to one valve end.
Epiphytic on the large, sea-ice diatom Entomoneis, coastal areas of Davis Station, East Antarctica; type locality, South Atlantic Ocean, 69°48’S 03°42’E, and coastal Queen Maud Land and Weddell Sea (Hasle et al., 1994).
Some species formerly included in Fragilaria and Synedra have been transferred to Synedropsis on the basis of their valve striation, the occurrence and structure of labiate processes and apical pore (slit) fields and the nature of the girdle (Hasle et al., 1994). Synedropsis hyperboreoides and S. laevis were collected in the present study, and several other species, e.g. S. fragilis, S. recta, S. lata var. lata and S. lata var. angustata, have been described from Antarctic locations (Hasle, 1994).