(Grunow) Lowe et al. 2014 Category: Symmetrical biraphid
BASIONYM: Navicula contenta Grunow in Van Heurck 1885
SYNONYM(S): Diadesmis contenta (Grunow) Mann
Contributor: Rex Lowe - January 2015
Length Range: 6.0-12.1 µm
Width Range: 2.4-2.6 µm
Striae in 10 µm: 36-38
Cells are linear, with slightly concave or slightly convex margins. The raphe is straight and simple. A central fascia is present, extending from the central nodule to the valve margins. Striae are difficult to resolve using light microscopy. The axial area is broad and linear. In SEM, the proximal raphe ends are bilaterally expanded in a T-shaped depression. The distal raphe ends have a longer bilaterally expanded T-shaped depression. Cells often grow attached to one another in short chains.
Basionym: Navicula contenta
Author: Grunow in Van Heurck 1885
Length Range: 7 µm
Width Range: 2 µm
Striae in 10 µm: 36
Lowe, R.L., Kociolek, J.P., Johansen, J.R., Van de Vijver, B., Lange-Bertalot, H. and Kopalová, K . (2014). Humidophila gen. nov., a new genus for a group of diatoms (Bacillariophyta) formerly within the genus Diadesmis: species from Hawai’i, including one new species. Diatom Research 29(4): 351-360.
Round, F.E., Crawford, R.M. and Mann, D.G. (1990). The Diatoms. Biology and Morphology of the Genera. Cambridge University Press, Cambridge, 747 pp.
Humidophila contenta is one of the few cosmopolitan species of this genus. It has been reported worldwide in soils and subaerial habitats.