Ehrenberg 1854 Category: Asymmetrical biraphid
BASIONYM: Gomphonema apicatum Ehrenberg 1854
Contributor: Pat Kociolek - September 2011
Length Range: 40-53 µm
Width Range: 13-15 (as measured at the broadest portion of the valve) µm
Striae in 10 µm: 9-11
Valves are acuminate-apiculate, asymmetric to the transapical axis, with a rounded footpole. The axial area is straight, broadening transversely to form the central area. The raphe is lateral and undulate. The striae are punctate, radiate at the poles to nearly parallel in the middle of the valve. Striae in the central valve are more widely spaced than other striae. On one side of the central area a stria is shortened, on the other side the central stria terminates next to the single stigma.
Basionym: Gomphonema apicatum
Author: Ehrenberg 1854
Length Range: µm
Striae in 10 µm:
Ehrenberg, C.G. (1854). Mikrogeologie. Einundvierzig Tafeln mit über viertausend grossentheils colorirten Figuren, Gezeichnet vom Verfasser. Voss, Leipzig., Pl. 5, II, fig. 23 (iconotype).
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.