From Frustule
| GENUS Entomoneis |
Ehrenberg (1845)
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Taxonomic Information
Generitype: Entomoneis alata Ehrenberg 1845
Jr. Synonymy: Navicula alata Ehrenberg 1840, Amphiprora alata (Ehr.) Kütz 1844
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Genus Description:
Cells usually observed in girdle view due to the presence of a quite well developed sigmoid elevation (winged keel) parapically oriented. Cell wall usually thinly silicified.
GIRDLE VIEW: In this view, the cell assumes a panduriform shape and, due to the sigmoid configuration, the two wings of a single valve appear at different levels of focus. Intercalary bands present, mostly quite numerous, with coarsely to finely striae margins, best seen in girdle view as longitudinal series of short dashes. The juncture of the keel with the valve body is such that it forms a 'line,' variously contoured, called a 'junction line' by Cleve (1894, p. 13) and a 'Trennungslinie' (separation line) by Hustedt (1930, p. 338.). Thickenings (struts) occur at various points along the wing or valve body, often along the junction line itself, but sometimes away from the juncture. The raphe is located along the apex of the keel as a simple slit, not apparent in girdle view.
VALVE VIEW: Valves linear to lanceolate, often with acuminate or cuneate extremities. In 'flat' valve view, the wings usually extend to or beyond the valve margin. Striae coarsely or finely punctate or lineate. Puncta in single or double rows. |
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- Ecologic Information: A majority of species in this genus are considered brackish to marine. Only a few taxa are characteristic of fresh water.
List of Species belonging to the Genus Entomoneis
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Useful References
- Patrick, R. and C. W. Reimer. 1975. The diatoms of the United States. Vol. 2, Pt. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13, 213pp.
