Planothidium abbreviatum
(Reimer) Potapova 2012 Category: Monoraphid
BASIONYM: Achnanthes lanceolata var. abbreviata Reimer 1966
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - November 2011
Length Range: 11-18 µm
Width Range: 6.1-8.5 µm
Striae in 10 µm: 11-12
Description
Valves are elliptic-lanceolate with subrostrate apices. The raphe valve has a transversely rectangular to elliptic central area. The rapheless valve has a wide rhomboid axial area and asymmetric central area that contains a hood on the internal valve surface. The raphe is straight with expanded external proximal ends. The multiseriate striae are radiate on both valves.
Original Description
Basionym: Achnanthes lanceolata var. abbreviata
Author: Reimer 1966
Length Range: 11-26 µm
Width Range: 6-8.5 µm
Striae in 10 µm: 10-12
Original Description
Pseudoraphe valve with shortened striae forming a broad, lanceolate pseudoraphe. Other features as in the nominate variety. Length 11-26 µ. Breadth 6-8.5 µ. Striae 10-12 in 10 µ.
Original Images
Cite This Page:
Potapova, M. (2011). Planothidium abbreviatum. In Diatoms of the United States. Retrieved March 07, 2014, from http://westerndiatoms.colorado.edu/taxa/species/planothidium_abbreviatum
Species: Planothidium abbreviatum
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves elliptic-lanceolate with subrostrate apices
- Raphe valve with transversely rectangular to elliptic central area
- Rapheless valve with rhomboid axial area
- Rapheless valve with hood
- Striae radiate
Valves are elliptic-lanceolate with subrostrate apices. The raphe valve has a transversely rectangular to elliptic central area. The rapheless valve has a rhomboid axial area and asymmetric central area with a hood on the internal valve surface. The striae are radiate.
Compare
Planothidium abbreviatum differs from P. frequentissimum by subrostrate apices, wider valves, and lower stria density.
Planothidium frequentissimum
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
Reimer, C.W. . (1966). Consideration of fifteen diatom taxa (Bacillariophyta) from the Savannah River, including seven described as new. Notulae Naturae (Academy of Natural Sciences of Philadelphia) 397:1-15.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: