Abstract
Abstract Beromia rexroadii gen. emend, et sp. nov. (algae incertae sedis) is described and illustrated from the Red Mountain Formation of Alabama and Georgia, the Lulbegrud Shale Member of the Noland Formation (Crab Orchard Group) of Kentucky, and the Lower Sodus Shale of New York. The wide geographic distribution and apparent short stratigraphic range of this new acritarch suggests it may be significant index fossil for correlation of Upper Llandovery strata of the eastern North American Platform. B. rexroadii gen. emend, et sp. nov. occurs with a diverse and abundant acritarch assemblage suggesting deposition in normal marine, nearshore to open‐shelf environments. The genus Beromia is emended here to incorporate morphologies having more than three processes and a new type of combination excystment structure. This new structure has an epityche on the epiderm, here termed an endodermal epityche. The periderm, in contrast, has a simple lateral split immediately adjacent to the endodermal epityche.
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