THE FRUSTULE STRUCTURE OF ORIGINAL MATERIAL OFAULACOSEIRA DISTANS(EHRENBERG) SIMONSEN

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Abstract
The original material from which Ehrenberg described Gallionella distans has been examined with light and electron microscopy with a view to understanding the morphology of a taxon that is now within the genus Aulacoseira and has a number of varieties. Aulacoseira distans has a distinctive heterovalvy, the “separation valves” that have no spines; areolae over the whole of the valve face; spines on the mantle edge are usually positioned between rows of areolae on the mantle which are in more or less straight rows; and a deep, thick ringleist with numerous rimoportulae against its inner side. Cells are found in short chains. This combination of characters does not match that in most published illustrations of A. distans and brings into question the taxonomic relationships of some of the published varieties. A lectotype has been chosen and deposted at BHU (the Ehrenberg collection at the Museum für Naturkunde der Humboldt-Universität in Berlin, and an isolectotype at BRM, (Bremerhaven).

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