Taxonomy and distribution of the genus Muelleria frenguelli

Diatom Research
By:  and 


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Navicula gibbula Cleve and its allies have a number of morphological characters which are visible under the light microscope and distinguish them from taxa included in Navicula Bory sensu stricto. These include proximal raphe ends which are sharply and unilaterally hooked and often extend beyond the central area, as well as two apparently thickened longitudinal ribs which extend the length of the valve on either side of the raphe. With the use of the SEM additional well-defined characters of the N. gibbula complex become apparent. Distal raphe ends are bifurcate and the valve face and mantle possess bipartite walls similar to those in Neidium Pfitzer. Furthermore, the apparently thickened longitudinal ribs are actually hollow canals, a feature reminiscent of the longitudinal canals of Diploneis Ehrenberg. Characters of the group are particularly well-defined and distinct from those of other genera, justifying separation from Navicula. Based on the valve morphology of N. gibbula and all other members of the section Naviculae fistulatae McCall, we separate these taxa from Navicula and resurrect the genus Muelleria Frenguelli to include them.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Taxonomy and distribution of the genus Muelleria frenguelli
Series title Diatom Research
Volume 12
Issue 1
Year Published 1997
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Diatom Research
First page 95
Last page 115