ABCDEFGHIJKLMNOPQRSTUVWXYZ

Authority

(Perag.) A.Mann (1937: 63, pl. 6, fig. 1)

Class

Diatomohyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Pseudonitzschia australis auct. non Frenguelli (1939), sensu Hustedt (1955: 43, pl. 15, fig. 1). See Hasle (1994: 1037)

top

Basionym

Nitzschia dubia var. australis Perag. (Peragallo, 1921: 65, pl. 3, figs 17, 18)

Additional References

N/A

Description

Cells solitary, biarcuate and rostrate; apical axis 83–110 µm; transapical axis 10–15 µm. Valves with a curved strongly ridged keel dividing them into 2 faces. Transapical striae straight, 19–25 in 10 µm, each composed of 2 rows of areolae. Central nodule present. Copulae numerous, simple (Fig. c).

Distribution

Coastal waters off Davis Station, East Antarctica; Petermann I., Antarctic Peninsula (Peragallo, 1921); Antarctic (Mann, 1937).

Comments

Specimens reported by Mann (1937) were 98–110 µm long, with the transapical axis 12–15 µm and 20 striae in 10 µm. Those of Peragallo (1921) were 90–100 µm long, with the transapical axis 10–12 µm and 19–20 striae in 10 µm. Cells collected by us measured 83–98 µm in length, with 25 striae in 10 µm.

top