W. Smith 1853      Category: Nitzschioid
TYPE SPECIES: Tryblionella acuminata W. Smith




Image Credit: Marina Potapova, Pat Kociolek

CLASS: Bacillariophyceae
  ORDER: Bacillariales
    FAMILY: Bacillariaceae

  1. Raphe eccentric
  2. Valve face with longitudinal undulation

Valves are typically linear-lanceolate to elliptical in some species. Like Nitzschia, Tryblionella possesses an eccentric raphe, positioned in a canal along one valve margin. The raphe systems within a frustule are positioned on opposite, in the manner of nitzschioid symmetry. The raphe canal is supported by fibulae. Valves have a distinct longitudinal undulation on the face.

Although Tryblionella was described in 1853, many recent floras include species within Nitzschia. Species within the genus Tryblionella occur in freshwater and marine waters.

Cite This Page:
Spaulding, S. (2011). Tryblionella. In Diatoms of the United States. Retrieved April 24, 2018, from

Contributor: Sarah Spaulding - October 2011