Navicula lanceolata
(Agardh) Ehrenberg 1838 Category: Symmetrical biraphid
BASIONYM: Frustulia lanceolata Agardh 1827
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Marina Potapova - May 2009
Length Range: 30-60 µm
Width Range: 9–12 µm
Striae in 10 µm: 10–13
Description
Valves are lanceolate, with rounded ends, 9-12 µm wide, 30-60 µm long. The raphe is filiform, with the central portions of the branches and central raphe endings slightly deflected towards the primary side of the valve. Terminal raphe fissures are hooked towards the secondary side. The axial area is narrow, linear. The central area is rounded rectangular or square. Striae are radiate, but convergent at the valve apices, 10-13 in 10 µm. Areolae ~32 in 10 µm.
Original Description
Basionym: Frustulia lanceolata
Author: Agardh 1827
Length Range: µm
Striae in 10 µm:
Original Description
Frustulia lanceolata, strato luteo-fusco submucoso e frustulis lanceolatis angustis obtusiusculis uniformiter coloratis constituto. In ostio thermarum ad Carlsbad, demersa ubi aqua adhuc calida (25 R.)
Original Images
Cite This Page:
Potapova, M. (2009). Navicula lanceolata. In Diatoms of the United States. Retrieved May 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/Navicula_lanceolata
Species: Navicula lanceolata
Contributor: Marina Potapova
Reviewer: Sam Rushforth
Image Credit: Marina Potapova
- Valve margin lanceolate, broad in the central valve and slightly rostrate, rounded ends
- Central area an irregular oval
- Striae radiate, except at the ends where they become convergent
Valves lanceolate with rounded ends. Striae radiate through most of the valve, becoming convergent at the ends. Central area is a somewhat rounded rectangle, or it may be square or irregular (asymmetric).
Compare
The valve ends of N. lanceolata are not apiculate, as they are in N. germainii. The valve is also broader in N. lanceolata and the striae are coarser. Navicula viridula is larger in size, with lower striae and areolae densities.
Navicula germainii
Wallace
Navicula viridula
(Kützing) Ehrenberg
Citations
Agardh, C.A. (1827). Aufzählung einiger in den ostereichischen Ländern gefundenen neuen Gattungen und Arten von Algen nebst ihrer Diagnostik und beigefugten Bemerkungen. Flora oder Botanische Zeitung, Regensburg 2:625-640.
Ehrenberg, C.G. (1838). Die Infusionsthierchen als vollkommene Organismen. Ein Blick in das tiefere organische Leben de Natur. erlag von Leopold Voss, Leipzig. pp. 1-xvii, 1-548, pls. 1-64.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 46859
Autecology Discussion
Fresh and brackish water. Eutraphentic, cold-water species.
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
Navicula lanceolata
Distribution
The distribution map represents the relative abundance of this Navicula lanceolata 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 Navicula lanceolata was not recorded, or with a red circle indicating the relative abundance of Navicula lanceolata.
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
Navicula lanceolata
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.