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Taxonomic comments on the genus Menoidium (Euglenozoa), with a description of Menoidium intermedium sp. nov.

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The genus Menoidium Perty (Rhabdomonadina, Euglenozoa) is currently chaotic as a result of (1) consideration of diagnostic features in several species that are absent in the type species, M. pellucidum Perty, (2) deliberate transfers of species from other genera to Menoidium, and (3) ignorance about the stability/variability of the diagnostic characters under diverse environmental conditions. By comparatively studying several strains of Menoidium in cultures under various environmental conditions, we aimed to investigate morphological plasticity and to identify criteria that could allow for the exact identification of a species. This morphological framework was used to assess the validity of previously described Menoidium species. In conjunction with recent molecular data, we re-evaluated the genus by presenting lists with doubtful (28 taxa) and well-described species (9 taxa), respectively. A new key for identification of species is presented for the latter. On the basis of structural re-examinations of cell structure in cultures, Menoidium intermedium nomen nudum is described and validated.

Keywords: Euglenozoa; Menoidium; Menoidium intermedium sp. nov.; Morphology; Taxonomy

Document Type: Original Article


Affiliations: 1: University of Castilla – La Mancha, Department of Environmental Sciences, Avda. Carlos III s/n, E-45071 Toledo, Spain; E-mail: 2: University of Vienna, Insitute of Ecology and Conservation Biology, Althanstr. 14, A-1090 Vienna, Austria 3: University of Vienna, Institute of Botany, Rennweg 14, A-1030 Vienna, Austria

Publication date: December 1, 2002

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