Craticula halophila
(Grunow) Mann in Round et al. 1990 Category: Symmetrical biraphid
BASIONYM: Navicula cuspidata var. halophila Grunow in Van Heurck 1885
SYNONYM(S): Navicula halophila (Grunow) Cleve
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Pat Kociolek - March 2011
Length Range: 22-32 µm
Width Range: 5-7 µm
Striae in 10 µm: 15-18
Description
Valves are linear-lanceolate with protracted, rounded apices. The axial area is narrow, straight, expanded to form a narrow sometimes narrowly elliptic central area. The raphe is filiform and straight. The striae are punctate, parallel in the middle, becoming convergent at the apices. There does not appear to be longitudinal striae formed in this morphology.
Patrick and Reimer (1966) and Krammer and Lange-Bertalot (1986) illustrate rhomboid valves for this species, but we have not yet encountered them. The rhomboid valves are without protracted apices, and the two morphologies probably represent two distinct taxa.
Original Description
Basionym: Navicula cuspidata var. halophila
Author: Grunow in Van Heurck 1885
Length Range: µm
Striae in 10 µm:
Original Description
var. halophila Grun. (Atl. Suppl. fig. 30.— in Type Ν° 12.) Etroit, très-petit : environ 5 c.d.m. ; stries délicates, 16 environ en 1 c.d.m., radiantes vers la partie moyenne, convergentes aux extrémités. Saumâtre. — Blankenberghe.
Original Images
Cite This Page:
Kociolek, P. (2011). Craticula halophila. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/craticula_halophila
Species: Craticula halophila
Contributor: Pat Kociolek
Reviewer: Rex Lowe
Image Credit: Pat Kociolek
- Valves linear-lanceolate
- Apices protracted, rounded
- Length 22-32 µm, breadth 5-7 µm
- Striae 15-18 in 10 µm
Valves linear-lanceolate with protracted, rounded apices. Axial area narrow, straight, expanded to form a narrow, sometime narrowly elliptic central area. Striae are punctate, parallel in the middle, becoming convergent at the apices.
Compare
This species is distinguished from C. accomoda by the shape of the valves (more lanceolate in C. halophila, more elliptical in C. accomoda).
Craticula accomoda
(Hustedt) Mann in Round, Crawford & Mann 1990
Citations
Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.
Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 21005
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
Craticula halophila
Distribution
The distribution map represents the relative abundance of this Craticula halophila 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 Craticula halophila was not recorded, or with a red circle indicating the relative abundance of Craticula halophila.
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
Craticula halophila
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.