Gomphoneis eriense var. angularis
Kociolek and Stoermer 1988 Category: Asymmetrical biraphid
BASIONYM: Gomphoneis eriense var. angularis Kociolek and Stoermer 1988
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Pat Kociolek - February 2011
Length Range: 34-67 µm
Width Range: 8-12 µm
Striae in 10 µm: 10-13 at the central portion, 14-16 at the poles
Description
Valves trullate, with broadest portion of the valve outline located towards the footpole from the central nodule. Apices rounded. Raphe distinctly undulate, with rounded external proximal ends. The axial area is narrow, straight, expanded slightly to form a linear-ellipsoidal central area that bears a single, relatively large stigma. A longitudinal line is positioned next to, or near, the axial area. Striae are distinctly biseriate, radiate near the central area, becoming parallel then radiate at the headpole, and becoming strongly radiate at the footpole. A distinct apical pore field is present at the footpole.
Original Description
Basionym: Gomphoneis eriense var. angularis
Author: Kociolek and Stoermer 1988
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Kociolek, P. (2011). Gomphoneis eriense. In Diatoms of the United States. Retrieved May 26, 2013, from http://westerndiatoms.colorado.edu/taxa/species/gomphoneis_angularis
Species: Gomphoneis eriense
Contributor: Pat Kociolek
Reviewer: Rex Lowe
Image Credit: Pat Kociolek
- Valves trullate
- Valve length 34-67 µm
- Striae 10-13 in center, 14-16 at poles
Valves trullate, with broadest portion of the valve outline located towards the footpole from the central nodule. Valves are relatively small, 34-67 um in length. Striae number 10-13 in center and 14-16 at the poles.
Compare
This species is distinguished from G. eriense var. eriense and G. eriense var. variabilis by the trullate shape of the valve. This species resembles both G. trullata and G. herculeana var. loweii in the shape of the valve, but is much smaller than either of those two species.
Gomphoneis eriense var. variabilis
Gomphoneis herculeana var. loweii
Gomphoneis trullata
Gomphoneis eriense
Citations
Kociolek, J.P. and Stoermer, E.F. (1988). Taxonomy, ultrastructure and distribution of Gomphoneis herculeana, G. eriense and closely related species (Naviculales: Gomphonemataceae). Proc. Acad. Nat. Sci. Phil. 140: 24-97. http://www.jstor.org/stable/4064935
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
Gomphoneis eriense var. angularis CAS
North American Diatom Ecological Database (NADED)
NADED ID: 36006