Navicula subrostellata
Hustedt 1955 Category: Symmetrical biraphid
BASIONYM: Navicula subrostellata Hustedt 1955
REPORTED AS: Navicula secreta var. apiculata (Patrick 1959) | Navicula ammophila (Witkowski et al. 2000)
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - November 2011
Length Range: 27-31 µm
Width Range: 6.0-6.8 µm
Striae in 10 µm: 14-16
Description
Valves are lanceolate to linear-lanceolate with protracted apices. The axial area is narrow and straight. The central area is round. External proximal raphe ends are straight and close to each other. Striae are straight and slightly radiate around the center, becoming parallel, then convergent at the apices. The areolae are clearly visible under LM, 23-26 in 10 μm.
Original Description
Basionym: Navicula subrostellata
Author: Hustedt 1955
Length Range: 30 µm
Width Range: 6 µm
Striae in 10 µm: 15
Original Description
Valves linear with parallel margins and strongly rostate acute ends, about 30 μ long, 6 μ broad. Raphe straight, threadlike, with approximate central pores; axial area very narrow; central area small, elongate-elliptical. Transapical striae slightly radiate, slightly convergent at the ends, about 15 in 10 μ, rather coarsely lineate, lineolae about 24 in 10 μ.
Original Images
Cite This Page:
Potapova, M. (2011). Navicula subrostellata. In Diatoms of the United States. Retrieved May 24, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_subrostellata
Species: Navicula subrostellata
Contributor: Marina Potapova
Reviewer: Sam Rushforth
Image Credit: Marina Potapova
- Valves lanceolate to linear-lanceolate with protracted apices
- Central area round
- External proximal raphe ends straight
- Central striae straight, slightly radiate
- Areolae clearly visible under LM
Valves are lanceolate to linear-lanceolate with protracted apices. The central area is round. Proximal raphe ends are straight and close. Striae are straight, slightly radiate around the center, becoming parallel then convergent at the apices. The areolae are clearly visible under LM, 23-26 in 10 μm.
Compare
Navicula subrostellata differs from N. gregaria by the round central area and straight proximal raphe ends.
Navicula gregaria
Citations
Hustedt, F. (1955). Marine littoral diatoms of Beaufort, North Carolina. Marine Station Bulletin 6:67 pp., 16 pls.
Patrick, R.M. (1959). New species and nomenclatural changes in the genus Navicula (Bacillariophyceae). Proceedings of the Academy of Natural Sciences of Philadelphia 111 (1959): 91-108 . http://www.jstor.org/stable/4064508
Witkowski, A., Lange-Bertalot, H. and Metzeltin, D. (2000). Diatom Flora of Marine Coasts I. Iconographia Diatomologica 7: 1-925.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Brackish water; in inland waters of high ionic content, estuaries, and in coastal habitats