Entomoneis Ehrenberg, 1845
Holotype species: Entomoneis alata (Ehrenberg) Ehrenberg
Original publication and holotype designation: Ehrenberg, C.G. (1845). Vorläufige zweite Mittheilung über die weitere Erkenntnifs der Beziehungen des kleinsten organischen Lebens zu den vulkanischen Massen der Erde. I. Über die vulkanischen Infusorien-Tuffe (Pyrobiolithen) am Rhein. II. Über einen bedeutenden Infusiorien haltenden vulkanischen Aschen-Tuff (Pyrobiolith) auf der Insel Ascension. III. Über einen See-Infusioren haltenden weissen vulkanische Aschen-Tuff (Pyrobiolith) als sehr grosse Gebirgsmasse in Patagonien. Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königlich-Preussischen Akademie der Wissenschaften zu Berlin 1845: 133-157.
Request PDFDescription: Cells usually observed (prepared mounts) in girdle view, or approximately so, 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.
Information contributed by: Patrick & Reimer (1975: 2).. The most recent alteration to this page was made on 2024-01-22 by M.D. Guiry.
Taxonomic status: This name is of an entity that is currently accepted taxonomically.
Gender: This genus name is currently treated as feminine.
Most recent taxonomic treatment adopted: Patrick, R. & Reimer, C.W. (1975). The diatoms of the United States exclusive of Alaska and Hawaii. Vol. 2, Part 1. Entomoneidaceae, Cymbellaceae, Gomphonemaceae, Epithemiaceae. pp. [i]-ix, [1]-213, 28 pls [in text]. Philadelphia: The Academy of Natural Sciences of Philadelphia.
Comments: The large majority of species in this genus are considered as brackish to marine. Only a few taxa are characteristic of fresh water.
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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera,
organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA)
and intended to be published in CD format.
These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above.
The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.
Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.
Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=43700
Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 22 January 2024. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 November 2024
