Gomphoneis eriense var. apiculata
Stoermer in Reimer 1982 Category: Asymmetrical biraphid
BASIONYM: Gomphoneis eriense var. apiculata Stoermer in Reimer 1982
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Pat Kociolek - January 2011
Length Range: 33-63 µm
Width Range: 12-14 µm
Striae in 10 µm: 12-14 at the central portion of the valve, 14-15 at the poles
Description
Valves are broadly lanceolate-clavate, with an apiculate headpole and rounded footpole. The axial area is narrow and expanded in the middle of the valve to form a rounded central area. A single stigma is present. Striae are formed by two rows of areolae arranged alternately. The striae are radiate to strongly radiate at the footpole. Longitudinal lines are present on either side of the axial area, and may be indistinct in some specimens. The apical pore field is distinct and bi-lobed. The apiculate headpole may be strongly or weakly developed, and the expanded portion of the valve (“shoulders”) near the headpole may be variable in is expression.
We exclude here the fossil specimens from Idaho cited by Kociolek and Stoermer (1988) as part of their concept of this taxon. Those are interpreted as a separate species.
Distribution: Verified only in Northwest Iowa.
Original Description
Basionym: Gomphoneis eriense var. apiculata
Author: Stoermer in Reimer 1982
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 20, 2013, from http://westerndiatoms.colorado.edu/taxa/species/gomphoneis_apiculata
Species: Gomphoneis eriense
Contributor: Pat Kociolek
Reviewer: Rex Lowe
Image Credit: Pat Kociolek
- Valves broadly lanceolate-clavate
- Headpole apiculate
- Longitudinal lines near the axial area
Valves are broadly lanceolate-clavate, with an apiculate headpole and a rounded footpole. Longitudinal lines are present on either side of the axial area, and may be indistinct in some specimens.
Compare
The position of the longitudinal line is suggestive of relationship with G. eriense and its close allies, but the apiculate headpole gives this species a distinctive shape.
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. apiculata CAS
North American Diatom Ecological Database (NADED)
NADED ID: