Platessa kingstonii
Potapova 2012 Category: Monoraphid
BASIONYM: Platessa kingstonii Potapova 2012
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - January 2012
Length Range: 7.4–11 µm
Width Range: 4.4–5.0 µm
Striae in 10 µm: 26–30 on raphe valve, 12-15 on rapheless valve
Description
Valves are elliptic. The raphe valve has a narrow linear axial area and a transversely rectangular central area. The raphe is filiform and straight with slightly expanded external distal and proximal ends. The internal proximal raphe ends are turned to opposite sides, while the internal distal ends have small helictoglossae. Striae are uniseriate and moderately radiate. The rapheless valve has a wide elliptic–lanceolate axial area and short triseriate striae.
Original Description
Basionym: Platessa kingstonii
Author: Potapova 2012
Length Range: 7.4-11.0 µm
Width Range: 4.4-5.0 µm
Striae in 10 µm: 26-30 on raphe valve, 12-15 on rapheless valve
Original Description
Original Images
Cite This Page:
Potapova, M. (2012). Platessa kingstonii. In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/species/platessa_kingstonii
Species: Platessa kingstonii
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves elliptic
- Raphe valve with uniseriate striae
- Rapheless valve with triseriate striae
- Raphe valve central area transversely rectangular
- Rapheless valve axial area wide, elliptic–lanceolate
Valves are elliptic. Raphe valve has a narrow linear axial area and transversely rectangular central area. Raphe is filiform, straight with slightly expanded external distal and proximal ends. Striae are uniseriate and moderately radiate on the raphe valve (26-30 in 10 μm). The rapheless valve has a wide elliptic–lanceolate axial area and short triseriate striae (12-15 in 10 μm).
Compare
Platessa kingstonii has a small, rectangular central area on the raphe valve and triseriate striae on the rapheless valve. In contrast, the central area of P. lutheri is bow-tie shaped and the striae are broad and biseriate on the rapheless valve.
Platessa lutheri
Citations
Potapova, M. (2012). New species and combinations in monoraphid diatoms (Family Achnanthidiaceae) from North America. Diatom Research 27(1): 29-42. doi:10.1080/0269249X.2011.644636
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
So far Platessa kingstonii has been found only in two streams in north–central Pennsylvania. Conductivity in these streams ranged from 19 to 38 μ S cm−1, and pH was 6.0–6.5.