Hustedt 1955 Category: Symmetrical biraphid
BASIONYM: Navicula subrostellata Hustedt 1955
REPORTED AS: Navicula secreta var. apiculata (Patrick 1959) | Navicula ammophila (Witkowski et al. 2000)
Contributor: Marina Potapova - October 2011
Length Range: 27-31 µm
Width Range: 6.0-6.8 µm
Striae in 10 µm: 14-16
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.
Basionym: Navicula subrostellata
Author: Hustedt 1955
Length Range: 30 µm
Width Range: 6 µm
Striae in 10 µm: 15
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.
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.
Brackish water; in inland waters of high ionic content, estuaries, and in coastal habitats