Morphologic variability in two populations ofArbusculidium filamentosum(Vavrdová 1965) Vavrdová 1972

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Abstract
The diacromorph acritarch genus Arbusculidium Deunff 1968 is characteristic of Upper Cambrian acritarch assemblages in southern Scandinavia, and of Lower Ordovician assemblages in South America, northern Africa, eastern Newfoundland, South China, and in western, central and northeastern Europe. The morphologic variability within two populations of Arbusculidium filamentosum from Lower Ordovician of Bohemia and China was investigated. A critical review of the literature regarding all established species of the genus and an evaluation of published information concerning about ten Lower Ordovician genera which are morphologically comparable with Arbusculidium, has resulted in an emendation of the diagnosis of Arbusculidium and the following new combinations: A. destombesii var. destombesii Deunff 1968 autonym, A. destombesii var. frondiferum Deunff 1968 stat. nov., comb. nov., A. destombesii var. striatulum Volkova 1988 stat. nov., comb, nov., A. filamento sum var. filamentosum (Vavrdová 1965) Vavrdová 1972, A. filamentosum var. coronatum Fang 1987 stat. nov., comb, nov., A. filamentosum var. gratiosum Cramer & Díez 1977 stat. nov., comb. nov., A. filamentosum var. latum Fang 1987 stat. nov., comb. nov., A. filamentosum var. sutile Cramer & Díez 1977 stat. nov., comb. nov., A. filamentosum var. yunnanensis (Gao 1991) stat. nov., comb. nov., Ladogella mamillosa (Welsch 1986) stat. nov., comb. nov., Arbusculidium? bicrure (Burmann 1968) comb. nov., Arbusculidium? fulcratum (Burmann 1968) comb. nov., Arbusculidium? fulcratum procerum (Burmann 1968) comb. nov., Arbusculidium? retiforme (Burmann 1968) comb. nov.