Elucidation of the cretaceous dinoflagellatediconodiniumEisenack and Cookson, 1960, and related peridinioid species from Australia

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Abstract
The peridinioid dinoflagellate Diconodinium and morphologically similar species are reviewed, following extensive microscopic examination of Australian holotypes and abundant Australian specimens. Descriptions are emended of all species for which the holotype has been studied, and for the genera Diconodinium and Dioxya. Accepted in Diconodinium are D. arcticum, D. cristatum, D. davidii, D. dispersum, D. multispinum, D. pelliferum and D. psilatum sp. nov. D. acutum and D. pussilum are junior synonyms of D. arcticum and D, multispinum, respectively. ?D. caulleryi, ?D. glabrum, and ?D. rhombiforme are too poorly known for confident assignment. "D. dabendorfense”;, “D. inequicorrutum”; and "D. fehmarnense”; do not belong to Diconodinium, but are too poorly known for confident assignment elsewhere. D. minutum is a synonym of Alterbia balmei. D. firmum, D. inflatum and D. tenuistriatum are transferred to Laciniadinium. Dioxya is a senior synonym of Vozzhennikovia. Accepted in Dioxya are D. apertura comb. nov., D. armata, ?D. extensa comb. nov., ?D. filigrana comb. nov., D. rotunda comb. nov., ?D. tenella comb. nov. and D. villosa.

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