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Round et Bukhtiyarova ex Round 1998      Category: Monoraphid
TYPE SPECIES: Achnanthes clevei Grunow in Cleve et Grunow




Image Credit: Marina Potapova

CLASS: Bacillariophycideae
  ORDER: Achnanthales
    FAMILY: Achnanthidiaceae

  1. Rapheless valve with nearly parallel striae
  2. Raphe valve with radial striae
  3. External distal raphe fissures curved to one side
  4. Internal expression of areolae occluded

The valves of Karayevia are elliptic to lanceolate with rostrate to capitate ends. The rapheless valve possesses striae that are nearly parallel, composed of circular areolae. The raphe valve possesses radial striae, composed of transapically elongate areolae. Externally, the distal raphe fissures curve to the same side. Internally, the areolae are occulded. Cells grow attached to sand grains, with many species preferring alkaline waters. This genus contains species related to Achnanthes clevei Grunow in Cleve et Grunow.

The original description of the genus, as Kolbesia, was invalid because the type was not designated (Fourtanier and Kociolek 1999) Round (1998) later validily published the genus. The type of Kolbesia and its members have been transfered to Karayevia.

Cite This Page:
Spaulding, S., and Edlund, M. (2008). Karayevia. In Diatoms of the United States. Retrieved May 25, 2018, from

Contributor: Sarah Spaulding | Mark Edlund - December 2008
Reviewer: Marina Potapova - May 2010