Gomphonema apicatum
Ehrenberg 1854 Category: Asymmetrical biraphid
BASIONYM: Gomphonema apicatum Ehrenberg 1854
LM scalebar = 10 µm = 40 pixels.
Observations
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
Description
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.
Original Description
Basionym: Gomphonema apicatum
Author: Ehrenberg 1854
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Kociolek, P. (2011). Gomphonema apicatum. In Diatoms of the United States. Retrieved May 24, 2013, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_apicatum
Species: Gomphonema apicatum
Contributor: Pat Kociolek
Reviewer: Rex Lowe
Image Credit: Pat Kociolek
- Valves acuminate-apiculate
- Widest portion of the valve near the apex
- Shortened stria opposite striae ending in stigma
Valves acuminate-apiculate and asymmetric to the transapical axis. The striae are punctate and radiate throughout to nearly parallel in the middle of the valve. Striae in the central valve are more widely spaced. On one side of the central area a stria is shortened, on the other side the central stria terminate next to the single stigma.
Compare
Gomphonema apicatum is more apiculate, and broader than either G. acuminatum or G. coronatum, two taxa with which it has been confused.
Gomphonema acuminatum
Gomphonema coronatum
Citations
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.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: