ABCDEFGHIJKLMNOPQRSTUVWXYZ

Authority

(Ehrenb.) Cleve (1894: 191)

Class

Diatomophyceae

Order

Pennales

Family

Naviculaceae

Synonyms

Stauroptera aspera (Ehrenb.) Ehrenb. (Ehrenberg, 1841: 135; 1843: 423, pl. 3, figs 3, 7)
Stauroneis aspera (Ehrenb.) Kütz. (Kützing, 1844: 106, pl. 29, fig. 12)
Stauroneis achnanthes (Ehrenb.) Kütz. (Kützing, 1844: 106, pl. 29, figs 20, 22)
Pinnularia aspera (Ehrenb.) Ehrenb. (Ehrenberg, 1854: pl. 19, fig. 26)
Navicula stauroneiformis Leud.-Fortm. (Leuduger-Fortmorel, 1892: 14)
Trachyneis aspera var. genuina Cleve (1894: 191), nom. inval.
Navicula aspera var. genuina (Cleve) Fricke (1902: 45), nom. inval.
See VanLandingham (1978: 4007) for further details of synonymy.

top

Basionym

Navicula aspera Ehrenb. (Ehrenberg, 1840: 213)

Additional References

Peragallo & Peragallo (1897–1908: 150, pl. 29, figs 1, 2), Hendey (1937: 346, pl. 10, fig. 10), Proschkina-Lavrenko (1950: 230, pl. 79, fig. 1), Cleve-Euler (1955: 5), Hendey (1964: 236, pl. 29, fig. 13), Ricard (1987: 100, figs 834–839)

Description

Cells solitary. Valves linear to elliptical, with rounded apices and deep mantles; apical axis 180–220 µm; transapical axis c. 40 µm. Transapical striae radiating, 7–10 in 10 µm, uniseriate, composed of groups (alveoli) of c. 5 slit-like poroids; area immediately around central raphe endings lacking poroids. Poroids 21–28 in 10 µm, each group opening internally by a single round hole (Fig. d). Raphe central; terminal raphe endings hooked; central endings sinuous and deflected in the same direction as the terminal endings (Fig. c). Chloroplasts 2, lying appressed to the girdle bands.

Distribution

Near Casey Station, East Antarctica; Plough I., near Davis Station, East Antarctica; Cape Tuxen, Petermann I., Port Lockroy, Argentine Is., King George I. (all Antarctic Peninsula) (Peragallo, 1921); Scotia Arc at 53°44.5’S 39°29.5’W (Hendey, 1937); Indian Ocean (Simonsen, 1974); Southern Ocean, 61°05’S 63°04’E and 69°06’S 78°21’E, “Belgica ” Expedition (van Heurck, 1909).

Comments

The slit-like poroids grouped into alveoli are a distinctive feature of this species. Some of the specimens found in the current study were in the size range (apical axis 70–80 µm) described for T. aspera var. antarctica Perag. (Peragallo, 1921).

top