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Diatoms of the United States is now known as Diatoms of North America.
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GENERA starting with "k"


Karayevia 7

  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

Monoraphid - 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...

Kobayasiella 6

  1. Striae radiate, may be crossed by longitudinal lines
  2. Striae very fine
  3. Axial area narrow
  4. Raphe straight, proximal raphe ends expanded

Symmetrical biraphid - Kobayasiella valves are linear to linear-lanceolate, with ends rostrate or expanded and capitate. Because the striae often number more than 30 in 10 microns, they may not be visible in the light microscope. The striae are radiate in the center of the valve and become convergent at the valve apices. The raphe is filiform, with proximal raphe ends expanded. The raphe has fine, but distinctive ‘kinks’ or deflections at...

Krasskella 1

  1. Valves small
  2. Proximal raphe ends distant
  3. Striae composed of an elongate areola on valve face

Symmetrical biraphid - Valves are small and elongate. The axial and central areas are linear. Striae composed of an elongate areola on valve face and a circular areola on the valve mantle. The proximal raphe ends distant and the raphe fissures are slightly oblique. Helictoglossae at the proximal and distal raphe ends are not well developed. Frustules rectangular in girdle view. Krasskella currently includes only three species, K....

Kurtkrammeria 8

  1. Valves naviculoid, slightly dorsiventral
  2. Areolae slit-like or crescent shaped
  3. Striae convergent at the apices
  4. 1-3 dorsal stigmata present, or stigma absent
  5. Apical pore fields present or absent

Asymmetrical biraphid - Valves are naviculoid and slightly dorsiventral, symmetric to the transapical axis and asymmetric to the apical axis. The raphe is centrally located. Areolae in the striae are slit-like or crescent shaped and oriented with their long axes parallel to the apical axis. Transapical striae are radiate near the valve center, becoming parallel, then convergent near the apices. A more or less well developed apical pore field...