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Authority

Perag. (1921: 66)

Class

Diatomohyceae

Order

Pennales

Family

Bacillariaceae

Synonyms

Nitzschia ostenfeldii van Heurck var. minor van Heurck (1909: 22, pl. 3, fig. 177)

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Basionym

N/A

Additional References

Hasle (1965a: 41, pl. 15, figs 6, 7), Hasle & Medlin (1990c: 182, pl. 24.7, figs 6, 7; pl. 24.4)

Description

Cells solitary, in apical view elongate with parallel sides pointed towards the poles; apical axis 49–118 µm; transapical axis 8–14 µm. Transapical striae straight in the centre, curved towards the poles, 8–11 in 10 µm. Interstrial membranes comprising 1 (occasionally 2) rows of poroid areolae; areolae c. 15 in 10 µm. Fibulae 8–11 in 10 µm. Central nodule absent.

Distribution

Type locality, Argentine Is. and Petermann I., Antarctic Peninsula (Peragallo, 1921); southern BRATEGG stations, Bellingshausen Sea (Hasle, 1965a); Antarctic (Hasle & Medlin, 1990c).

Comments

Nitzschia barbieri has only rarely been recorded since Peragallo (1921) and Hasle (1965a). See discussion under Fragilariopsis rhombica .

Nitzschia barbieri, Fragilariopsis rhombica , F. separanda and are rather similar in gross morpholgy (see Table).

Table: Comparison of Fragilariopsis rhombica , F. separanda and Nitzschia barbieri (data from Hasle & Medlin, 1990c).

Apical axis (µm)

Striae in 10 µm

Rows of areolae

F. rhombica

8–53

8–16

1–2

F. separanda

10–33

10–14

1

N. barbieri

49–118

8–11

1 (–2)

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