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Authority

(Grunow) Mereschk. (Mereschkowsky, 1902: 78)

Class

Diatomophyceae

Order

Pennales

Family

Thalassionemataceae

Synonyms

Thalassiothrix nitzschioides (Grunow) Grunow, in van Heurck (1881: pl. 37, figs 11–13; pl. 43, figs 7–10)
Synedra nitzschioides var. minor Cleve (1883: 482)
Thalassiothrix curvata Castrac. (Castracane, 1886: 55, pl. 24, fig. 6)
Thalassiothrix frauenfeldii var. nitzschioides (Grunow) Jörg. (Jörgensen, 1900: 21)
Thalassionema nitzschioides f. curta [?error of F.W.Mills (1935: 1605) for Thalassiothrix curvata Castrac.]
See VanLandingham (1978: 3991) for full synonymy.

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Basionym

Synedra nitzschioides Grunow (1862: 403, pl. 5, fig. 18)

Additional References

Heiden & Kolbe (1928: 563, pl. 5, figs 115–118), Hendey (1937: 336), Hustedt (1958: 139), Hallegraeff (1986: 60–65), Hasle & Syvertsen (1997: 257, pl. 56(2), 57a, b, tab. 66)

Description

Cells straight, forming stellate or zig-zag colonies. Valves linear, tapering, rounded towards the apices; apical axis 10–80 (–105) µm; antapical axis 2–3.5 µm; pervalvar axis c. 2 (–7) µm. Valve surface flat. Areolae located along margins, externally with elaborate vela (Fig. b), internally simple, 10–12 in 10 µm.

Distribution

Southern Ocean, 60°50’S 93°36’E, offshore Wilhelm II Land, coastal waters off Davis Station, East Antarctica, and southern Pacific Ocean; Kerguelen Is. (Heiden & Kolbe, 1928); coastal Europe and North Atlantic Ocean (Hendey, 1937); “cosmopolitan but not in the high Arctic and Antarctic” (Hasle & Syvertsen, 1997).

Comments

One unusually large cell in the present study measured 105 × 7 µm, but otherwise it had all the attributes of T. nitzschioides. A similar species, T. gelida Perag., described from Petermann Island, has cells 100–120 µm long and 8 areolae in 10 µm.

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