Planothidium lanceolatum
(Brébisson ex Kützing) Lange-Bertalot 1999 Category: Monoraphid
BASIONYM: Achnanthidium lanceolatum Brébisson ex Kützing 1846
SYNONYM(S): Achnanthes lanceolata (Brébisson ex Kützing) Grunow in Van Heurck
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - December 2010
Length Range: 7-24 µm
Width Range: 4.5-8.0 µm
Striae in 10 µm: 12-15
Description
Valves are lanceolate to elliptical-lanceolate with slightly drawn-out apices. The raphe valve has a linear axial area and central area that varies in shape - from transversely rectangular to elliptical. The rapheless valve has a linear-lanceolate axial area that slightly widens in the middle. The asymmetrical central area on the rapheless valve contains a rimmed depression on the internal valve surface.The raphe is straight with expanded external proximal endings. Terminal raphe fissures are curved to the secondary valve side. The striae are multiseriate and radiate throughout both valves.
Original Description
Basionym: Achnanthidium lanceolatum
Author: Brébisson ex Kützing 1846
Length Range: 16 µm
Striae in 10 µm:
Original Description
A. a latere secundario elliptico – lanceolato; apicibus obtusis, rotundatis. — Long. 1/140'''.
Original Images
Cite This Page:
Potapova, M. (2010). Planothidium lanceolatum. In Diatoms of the United States. Retrieved May 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/planothidium_lanceolatum
Species: Planothidium lanceolatum
Contributor: Marina Potapova
Image Credit: Marina Potapova
- Valves lanceolate to elliptical-lanceolate with slightly drawn-out apices
- Valves 4.5-8.0 μm wide
- Rapheless valve with asymmetrical central area containing depression
Valves are lanceolate to elliptical-lanceolate with slightly drawn-out apices, 7-24 μm long, 4.5-8.0 μm wide. The asymmetrical central area on rapheless valve contains a rimmed depression on the internal valve surface. The striae are multiseriate, radiate throughout both valves, 12-15 in 10 μm.
Compare
Planothidium lanceolatum differs from many other Planothidium species by the presence of a rimmed depression on the internal surface of the central area. The raphe valves of P. lanceolatum may not be distinguishable from the lanceolate raphe valves of P. frequentissimum. The rapheless valves, however, of P. frequentissimum, possess a hood rather than depression. Planothidium haynaldii differs from P. lanceolatum by capitate valve apices.
Planothidium haynaldii
Planothidium frequentissimum
Citations
Lange-Bertalot, H. (1999). Neue Kombinationen von taxa aus Achnanthes Bory (sensu lato). Iconographia Diatomologica 6: 276-289.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 155003
Autecology Discussion
EMAP Assessment
Sampling for the Environmental Protection Agency (EPA) western Environmental Monitoring and Assessment Program (EMAP) study was completed during the years 2000-2004 (see citations at bottom of this page). Streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming). Over 1200 sites on streams and rivers in 12 western states (Arizona, California, Colorado, Idaho, Montana, Nevada, North Dakota, Oregon, South Dakota, Utah, Washington and Wyoming) were selected for sampling based on a stratified randomized design. This type of design insures that ecological resources are sampled in proportion to their actual geographical presence. Stratified randomized design also allows for estimates of stream length with a known confidence in several “condition classes” (good or least-disturbed, intermediately-disturbed, and poor or most-disturbed) for biotic condition, chemistry and habitat.
EMAP Distribution
Planothidium lanceolatum
Distribution
The distribution map represents the relative abundance of this Planothidium lanceolatum in the western EMAP study. Relative abundance is a measure of the proportion of cells of this species based on a "fixed count" of 300 total diatom cells counted and identified. Each of the western EMAP sample sites is shown, either with a black dot for sites where Planothidium lanceolatum was not recorded, or with a red circle indicating the relative abundance of Planothidium lanceolatum.
Note that the size of the proportional symbols varies between species to help show both abundant and rare species.
Scale for the map to the left
EMAP Response Plots
Planothidium lanceolatum
EMAP citations
Results are published in:
Johnson, T., Hermann, K., Spaulding, S., Beyea, B., Theel, C., Sada, R., Bollman, W., Bowman, J., Larsen, A., Vining, K., Ostermiller, J., Petersen, D. Hargett, E. and Zumberge, J. (2009). An ecological assessment of USEPA Region 8 streams and rivers. U.S. Environmental Protection Agency Region 8 Report, 178 p.
Stoddard, J. L., Peck, D. V., Olsen, A. R., Larsen, D. P., Van Sickle, J., Hawkins, C. P., Hughes, R. M., Whittier, T. R., Lomnicky, G. A., Herlihy, A. T., Kaufman, P. R., Peterson, S. A., Ringold, P. L., Paulsen, S. G., and Blair, R. (2005). Environmental Monitoring and Assessment Program (EMAP) western streams and rivers statistical summary. U.S. Environmental Protection Agency Report 620/R-05/006, 1,762 p.
Stoddard, J. L., Peck, D. V., Paulsen, S. G., Van Sickle, J., Hawkins, C. P., Herlihy, A. T., Hughes, R. M., Kaufman, P. R., Larsen, D. P., Lomnicky, G. A., Olsen, A. R., Peterson, S. A., Ringold, P. L., and Whittier, T. R. (2005). An ecological assessment of western streams and rivers. U.S. Environmental Protection Agency Report 620/R-05/005, 49 p.