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Authority

Grunow, in Cleve & Grunow (1880: 53)

Class

Diatomophyceae

Order

Pennales

Family

Pleurosigmataceae

Synonyms

N/A

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Basionym

N/A

Additional References

Hendey (1937: 348), Hasle & Syvertsen (1997: 282, pl. 62, tab. 71)

Description

Cells solitary. Valves flat, lanceolate, slightly sigmoidal, with subacute ends; apical axis 180–270 µm; transapical axis c. 44 µm. Raphe straight or slightly sigmoidal; central endings deflected in the same direction; pole endings deflected in opposite directions. Valve striation fine, orientated in 3 distinct directions, one transverse and two oblique; oblique striae 18.5 in 10 µm.

Distribution

Near Davis Station, East Antarctica; cosmopolitan (Hasle & Syvertsen, 1996); near South Georgia (Hendey, 1937); coastal waters off Syowa Station, East Antarctica (Ishikawa et al., 2001).

Comments

Hendey (1937) also reported P. smithianum Castrac. from Bransfield Strait. Published descriptions of that rare species are rather incomplete.

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