Gomphonema louisiananum

Kalinsky 1984      Category: Asymmetrical biraphid

REPORTED AS: Gomphonema patricki (Kociolek and Stoermer 1995) | Gomphonema camburnii (Metzeltin and Lange-Bertalot 1998) | Gomphonema puiggarianum var. aequatorialis (Camburn, Lowe and Stoneburner 1978) 

Gomphonema kobayasii


Gomphonema manubrium

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls | Ian Bishop - September 2013
Length Range: 14-38 µm
Width Range: 3.8-5.5 µm
Striae in 10 µm: 11-12 at the valve center, 14-16 at the apices


Valves are lanceolate-clavate, widest at the center. The headpole and footpole are narrowly rounded. The axial area is large and lanceolate. The raphe is filiform, with weakly expanded proximal ends that are bent slightly to one side. Striae are uniseriate and very short. The striae are parallel at the valve center and radiate near the apices.

Note that G. camburnii and G. patrickii are heterotypic, or subjective, synonyms of this taxon.

Original Description

Author: Kalinsky 1984
Length Range: 13-30 µm
Width Range: 3-5 µm
Striae in 10 µm: 12-13 at the valve center, 15 at the apices

Original Description

Valve lanceolate, evenly narrowed toward the apex and basis, apex slightly broader. Axial and central area forming a broad lanceolate area. Striae uniformly shortened, slightly radiate throughout most of the valve to almost parallel at the apex. Striae, 12-13 in 10 µm at the centre of the valve to 15 in 10 µm near the apices. Length, 13-30 µm. Breadth, 3-5 µm.

Original Images

Cite This Page:
Bahls, L., and Bishop, I. (2013). Gomphonema louisiananum. In Diatoms of the United States. Retrieved April 26, 2018, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_patricki

Species: Gomphonema louisiananum

Contributor: Loren Bahls | Ian Bishop

Reviewer: Kalina Manoylov, Rex Lowe


Camburn, K.E. and Charles, D.F. (2000). Diatoms of Low-Alkalinity Lakes in the Northeastern United States. Academy of Natural Sciences of Philadelphia, Special Publication 18, 152 pp.

Camburn, K.E., Lowe, R.L., and Stoneburner, D.L. (1978). The haptobenthic diatom flora of Long Branch Creek, South Carolina. Nova Hedwigia 30: 149-279.

Kalinsky, R.G. (1984). Notes on Louisiana diatoms. III. Some new, rare, and interesting diatoms from northwestern Louisiana. In: Proceedings of the Seventh International Diatom Symposium (D.G. Mann, ed.), Otto Koeltz Science Publishers, Koenigstein, pp. 299-306.

Kociolek, J.P., Stoermer, E.F., and Edlund, M.A. (1995). Two new freshwater diatom species. In: A Century of Diatom Research in North America: A Tribute to the Distinguished Careers of Charles W. Reimer and Ruth Patrick (J.P. Kociolek and M.J. Sullivan, eds.), pp. 9-19.

Metzeltin, D. and Lange-Bertalot, H. (1998). Tropical diatoms of South America I: About 700 predominantly rarely known or new taxa representative of the neotropical flora. In: Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 5. Diversity-Taxonomy-Geobotany. Koeltz Scientific Books. Königstein, Germany, 5:695 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Gomphonema louisiananum CAS

North American Diatom Ecological Database (NADED)

NADED ID: 37193

Autecology Discussion

Gomphonema louisiananum was described from material collected at a reservoir in northwestern Louisiana and subsequently reported (as G. patricki) from a lake in the Sierra Nevada Mountains of California (Kociolek et al. 1995). This taxon has also been reported from a stream in South Carolina (Camburn et al. 1978), from low-alkalinity lakes in Minnesota and New York (Camburn & Charles 2000), and from a river in Brazil (Metzeltin & Lange-Bertalot 1998). It was recently found in samples collected from a subalpine lake in the Eagle Cap Wilderness of northeastern Oregon and a lake near sea level on the Haida Gwaii Archipelago of British Columbia (photos below). Environmental data are not available for these sites.


Horseshoe Lake, Eagle Cap Wilderness, Wallowa County, Oregon: home of Gomphonema patrickiae.

Credit/Source: Angela Bohlke, Adventurers and Scientists for Conservation

Lake at La Beche Inlet, Juan Perez Sound, Haida Gwaii Archipelago, British Columbia: home of Gomphonema patrickiae.

Credit/Source: Beverly Boynton, Adventurers and Scientists for Conservation


- Extension of Size Range

Prior to this date, length was documented as 17.2-29.1 µm, width as 4.0-5.4 µm. These values were revised to reflect the length and width of a recently found robust population of this taxon. New images from this Eleanor Creek population have replaced those from Oregon and British Columbia. - I. Bishop