• Coscinodiscus radiatus var. asteromphalus : Ehrenberg (1854)
• Coscinodiscus asteromphalus var. conspicua : Grunow A. (1883)
• Coscinodiscus asteramphalus var. genuina : Grunow A. (1884)

Solitary. In valve view the cells are circular in shape, while in girdle view they appear slightly convex with a relatively long pervalvar axis. The central area of the valve surface is depressed and a central rosette of large polygonal areolae can be seen. These areolae, arranged in a radial pattern, are almost all the same size except that the ones closest to the margin of the valve are smaller. There are two large labiate processes (rimoportulae). Numerous large chloroplasts are dispersed throughout the cell.

Pelagic, marine.

Distribution: Europe: Romania (Caraus, 2002).
Antarctic and Sub-Antarctic islands: Antarctic (Scott and Thomas, 2005).

The algae of Romania., Studii si Cercetari, Universitatea Bacau, Biologie 7, Caraus I., 2002, 1-694

Diatoms. In: Antarctic marine protists. (Scott, F.J. & Marchant, H.J. Eds), Canberra & Hobart: Australian Biological Resources Study; Australian Antarctic Division, Scott F.J., Thomas D.P., 2005, 13-201.

Mittheilung über zwei neue lager von Gebirgsmassen aus infusorien als Meeres-Absatz in Nord Amerika und eine vergleichung derselben mit den organischen Kreide-Ge-bilden in Europa und Afrika., Bericht über die zur Bekanntmachung Geeigneten Verhandlungen der Königl. Preuss. Akademie Der Wissenschaften zu Berlin 1844:, Ehrenberg C.G., 1845, 57-97