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Original Articles

Transapical sutures in dinoflagellate cysts

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Pages 49-56 | Published online: 26 Aug 2010
 

Abstract

Several lacustrine species of Pleistocene and Recent peridiniacean cysts form archeopyles by means of a single transapical suture, with or without accessory sutures. Previously published records of closely similar structures in marine Cretaceous peridiniacean cysts are documented and reinterpreted, and a further type is described from the Albian of Oklahoma. These bipesioid cysts appear to represent a lineage that diverged from the marine peridiniacean stock in the Early Cretaceous and invaded freshwater environments during the Tertiary, completely abandoning marine environments by the Quaternary.

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