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Free Content Microscopic observations of Aulacoseira sphaerica (Bacillariophyta)

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Background and aimsAulacoseira sphaerica (Hérib.) Simonsen is described from samples of a boring made in a Late Pliocene freshwater maar sediments in Nogaret (Escandorgue volcanic massif, France). This species is described and compared with works of other authors.

Methods – The morphology of this species is examined using light microscopy (LM) and scanning electron microscope (SEM).

Key results – Our observations correspond with Héribaud's (1903) description of Melosira sphaerica. It is an initial cell of an unknown Aulacoseira that is either extinct or does not form auxospores in recent waters. But we do not agree with Loseva's (1980) identification of this species found in the upper Pliocene deposits from the locality Omara (Russia) in the Kama river (Volga's tributary) basin.

ConclusionA. sphaerica remains considered as a Late Pliocene fossil, endemic in the south of France (Massif Central, Escandorgue).

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Keywords: AULACOSEIRA; AUXOSPORE; DIATOM; ESCANDORGUE; FRANCE; FRESHWATER; INITIAL CELL; LATE PLIOCENE; MASSIF CENTRAL

Document Type: Regular Paper

Publication date: 01 November 2010

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  • Plant Ecology and Evolution (a continuation of Belgian Journal of Botany, incorporating Systematics and Geography of Plants) is an international journal devoted to ecology, phylogenetics and systematics of all 'plant' groups in the traditional sense (including algae, cyanobacteria, fungi, myxomycetes), also covering related fields such as comparative and developmental morphology, conservation biology, ecophysiology, evolution, phytogeography, pollen and spores, population biology, and vegetation studies. It is published by the Royal Botanical Society of Belgium and the Botanic Garden Meise and contains original research papers, review articles, checklists, short communications and book reviews.

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