• Category
  • Length Range
    9-15.3 µm
  • Width Range
    6.9-10.6 µm
  • Striae in 10 µm
    rapheless: 10-14, raphe: 25-27 at margin, 38-40 near axial area

Identification

Description

Valves are broadly elliptical. The raphe valve has a narrow axial area, although the striae near the axial area may not be visible in LM. The striae are fine and radiate. The striae on the raphe valve number 25 to 27 in 10 µm near the valve margin, and near 40 in µm near the axial area. The rapheless valve has a broad, lanceolate axial area that covers 1/3 to 1/2 the width of the valve. The striae are coarse, square to elliptical, and radiate. The number of areolae ranges from 3 to 5.

Autecology

This species has been reported from northern Europe, Canada and New England, USA. It is probably most common in lotic ecosystems.

Original Description

  • Author
    E.Reichardt 1982
  • Length Range
    11.5-13.5 µm
  • Width
    8.5-9.5 µm

Original Images

Cocconeis pseudothumensis orig illus
Cocconeis pseudothumensis orig descr

Cite This Page

Lowe, R. (2015). Cocconeis pseudothumensis. In Diatoms of North America. Retrieved February 19, 2025, from https://diatoms.org/species/50270/cocconeis_pseudothumensis