• Category
  • Length Range
    38.4-60 µm
  • Width Range
    1.7-2.5 µm
  • Striae in 10 µm
    20-22
  • Synonyms
    Asterionella zasuminensis (Cabejsz.) Lundh-Alm.

Identification

Description

Valves linear and elongate, weakly dorsiventral. The dorsal margin is slightly convex and the ventral margin is slightly concave giving the valves slight asymmetry appearance to the apical axis. Valves can sometimes be irregularly wavy. Apices capitate, 3.5-4.0 µm wide, ending truncate. Raphe short, present on the ventral face-mantle junction on the ventral side of each valve end. The transapical striae are parallel throughout. In girdle view the valves are often not straight and the apices are expanded in the pervalvar axis.

Autecology

Eunotia zasuminensis is reported from low alkalinity and dystrophic lakes of the Adirondacks. In lakes of Finland, E. zasuminensis forms zig-zag to stellate colonies and was most abundant in the summer months of July and August (Eloranta 1986). In addition to being reported in lakes, this taxon has also been reported from large rivers in the Amazon River Basin (Wetzel et al. 2010). Material illustrated here is from boreal lakes in northern Minnesota (Voyageurs National Park) and was collected as part of the National Park Service Great Lakes Inventory and Monitoring Network.

Euzasumensis  Usgsbiodata
Credit: USGS Biodata
The distribution of Eunotia zasuminensis in rivers of the United States. Accessed on July 5, 2017

Original Description

  • Basionym
    Fragilaria zasuminensis
  • Author
    Cabejsz. 1937

Cite This Page

Burge, D., Edlund, M. (2017). Eunotia zasuminensis. In Diatoms of North America. Retrieved February 22, 2025, from https://diatoms.org/species/52434/eunotia_zasuminensis