Karayevia ploenensis var. gessneri
(Hustedt) Bukhtiyarova 1999 Category: Monoraphid
BASIONYM: Achnanthes gessneri Hustedt 1953
SYNONYM(S): Achnanthes ploenensis var. gessneri (Hustedt) Lange-Bertalot in Lange-Bertalot & Krammer
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - May 2010
Length Range: 11-16 µm
Width Range: 4.8-5.6 µm
Striae in 10 µm: 14-16 in the center of raphe valve, 15-17 in the center of raphe valve, up to 20 at the ends
Description
Valves are elliptical-lanceolate with subrostrate to rostrate apices. Both raphe and rapheless valves have a narrow lanceolate axial area and lack a distinct central area. The raphe is straight. Striae on the raphe valve are strongly radiate, becoming parallel to slightly convergent toward the apices. The striae on the rapheless valve are slightly radiate, becoming parallel to slightly convergent toward the apices. The striae on the rapheless valve are interrupted by a marginal longitudinal line on each side of the valve.
Original Description
Basionym: Achnanthes gessneri
Author: Hustedt 1953
Length Range: 14-17 µm
Width Range: 5-6 µm
Striae in 10 µm: 16 in the center of raphe valve
Original Description
Valvae elliptico-lanceolatae apicibus obtuse rostratis, 14-17 µ latae. Rhaphovalva rhaphe directa poris centralibus approximatis, area axiali anguste lanceolata, striis transapicalibus radiantibus in media parte circiter 16 in 10 µ, ad apices versus paulo densioribus, usque ad 20 in 10 µ. Areovalva area axiali anguste lanceolata, striis transapicalibus in media parte lenissime radiantibus vel ad lineam mediam perpendicularibus, 16-20 in 10 µ, ad apices versus magis radiantibus et paulo densioribus, prope marginem costa longitudinali decussatis. Fig. 14-19.
Original Images
Cite This Page:
Potapova, M. (2010). Karayevia ploenensis. In Diatoms of the United States. Retrieved June 27, 2017, from http://westerndiatoms.colorado.edu/taxa/species/karayevia_ploenensis
Species: Karayevia ploenensis
Contributor: Marina Potapova
Reviewer: Rex Lowe
Image Credit: Marina Potapova
- Valves 4.8-5.6 µm wide
- Valve ends subrostrate to rostrate
- Rapheless valve with hyaline lines
- Axial area lanceolate
Valves are elliptical-lanceolate with subrostrate to rostrate apices. Both raphe and rapheless valves have a lanceolate axial area and lack a distinct central area. Striae in the center of raphe valve are strongly radiate. On the rapheless valve they are are slightly radiate. Only on rapheless valve the striae are interrupted by a longitudinal hyaline line on each side of the valve.
Compare
Karayevia amoena and K. nitidiformis are more narrow in width, ends are more capitate, and a longitudinal hyaline line is present on the raphe valve. Karayevia gessneri has slightly wider valves, but note that the nominate variety has not been verified in the US.
Karayevia amoena
Karayevia laterostrata
Karayevia nitidiformis
Citations
Bukhtiyarova, L. (1999). Diatoms of Ukraine inland waters. National Academy of Sciences of Ukraine, M.G. Kholodny Institute of Botany, Kyiv, Ukraine. 133 pp.
Hustedt, F. (1953). Diatomeen aus der Oase Gafsa in Südtunesien, ein Beitrag zur Kenntnis der Vegetation afrikanischer Oasen. Archiv für Hydrobiologie 48: 145-153.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
Karayevia ploenensis var. gessneri CAS
North American Diatom Ecological Database (NADED)
NADED ID: 125008