Fascinorbis gen. nov., a new genus of Stephanodiscaceae (Bacillariophyta) from a Late Miocene lacustrine diatomite. Issue 2 (2nd April 2020)

• Record Type: Journal Article
• Authors: Stone, Jeffery R.; Edlund, Mark B.; Alverson, Andrew J.
• Is Part Of: Diatom research. Volume 35:Issue 2(2020)
• Page Start: 127
• Page End: 139
• Publication Date: 2020-04-02
• Subjects: Lindavia -- fossil -- taxonomy -- extinct -- Thalassiosirales -- Cyclotella; Diatoms -- Periodicals; Diatoms -- Research -- Periodicals; Diatoms; Diatoms -- Research; Periodicals; 579.85
• DOI: 10.1080/0269249X.2020.1764870
• Languages: English
• ISSNs: 0269-249X

Abstract

Abstract : We used light and electron microscopy to characterize a Late Miocene freshwater diatomite deposit in the Chalk Hills Formation, near Payette, Idaho, USA. The diatom assemblage from this sample was nearly monotypic, dominated by a single taxon with similarities to Lindavia bodanica (Thalassiosirales) but with several features uncharacteristic of the genus Lindavia, such as a rimoportula(e) on the valve mantle located on a costa, simple alveolar structure, and spines at the external valve face-mantle junction. A combination of other characters for this species complicate its placement into existing genera, including a lack of central fultoportulae, central area with loculate areolae with domed cribra, and a single ring of mantle fultoportulae with three satellite pores with well-developed cowlings and broad satellite pore covers. Based on this unique set of features, we have established a new genus, Fascinorbis, which appears to represent an important transitional form in the evolution of the Lindavia lineage.