Gomphonema

Ehrenberg 1832      Category: Asymmetrical biraphid
TYPE SPECIES: Gomphonema acuminatum Ehrenberg

Gomphoneis

 

Gomphosphenia

Image Credit: Sarah Spaulding

CLASS: Bacillariophyceae
  ORDER: Cymbellales
    FAMILY: Gomphonemataeae

  1. Valve outline club-shaped (clavate)
  2. Single stigma may be present on one side of the central area
  3. Apical pore field present

Gomphonema valves are symmetrical to the apical axis, and asymmetrical to the transapical axis. In girdle view, frustules are wedge-shaped (cuneate). Striae are not crossed by longitudinal lines, as in Gomphoneis. A stigma may be present or absent on one side of the central area. An apical porefield is present and bisected by the terminal raphe.

Many species grow on mucilaginous stalks and can be found in nearly every habitat type within circumneutral lakes and streams of North America.

Cite This Page:
Spaulding, S., and Edlund, M. (2009). Gomphonema. In Diatoms of the United States. Retrieved November 01, 2014, from http://westerndiatoms.colorado.edu/taxa/genus/Gomphonema

Contributor: Sarah Spaulding | Mark Edlund - January 2009