(Hustedt) Lange-Bertalot in Rumrich et al. 2000 Category: Symmetrical biraphid
BASIONYM: Navicula buderi Hustedt 1954
REPORTED AS: Navicula halophila (Krammer and Lange-Bertalot 1986, p. 126, plate 44, figs. 3-8, 14-18) | Navicula halophila (Diatoms of the US)
Valves are elliptic-lanceolate to lanceolate with short protracted rostrate apices. The axial area is very narrow. The central area is only slightly wider than the axial area and elliptic in shape. The raphe is filiform with straight, weakly expanded proximal ends and distal ends that are hooked in the same direction. Striae are parallel to weakly radiate at the valve center, becoming convergent towards the apices. Areolae are extremely fine and not easily resolved in LM.
Basionym: Navicula buderi
Author: Hustedt 1954
Length Range: 7-20 µm
Width Range: 4.5-6.5 µm
Striae in 10 µm: 17-20
Valvae late ellipticae apicibus late rotundatis, saepissime lineares vel lineari-lanceolatae apicibus obtuse cuneatis vel rostratis, 7 bis 20 µ longae, 4,5 bis 6,5 µ latae. Rhaphe directa, filiformis, fissuris terminalibus in eadem directione curvatis. Area axialis angustissima, area centralis nulla vel minima. Striae transpicales ad lineam mediam perpendiculares, 17 bis 20 in 10 µ, striae longitudinales delicatssimae. Fig. 11 bis 15.
Hustedt, F. (1954). Neue und wenig bekannte Diatomeen. VI. Berichte der Deutschen Botanishen Gesellschaft 67: 269-280.
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.
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.
Craticula buderi is widely distributed in a variety of habitats throughout the Northwest United States, where it prefers alkaline waters with moderate levels of dissolved solids. There are 80 confirmed records of this taxon in the Montana Diatom Collection. North Widgeon Slough in Sheridan County, Montana, produced the specimens imaged here. On the sampling date, North Widgeon Slough had a pH of 8.70 and a specific conductance of 12,800 µS/cm.
Specimens of the morphological range shown here were originally posted on the Diatoms of the US site (J.P. Kociolek, contributor) as Craticula halophila. Further work showed that the specimens here are aligned with the type of Craticula buderi. The name of this page was changed from C. halophila to C. buderi. A new page for C. halophila was opened. - S. Spaulding