Aloisalthella, a new genus of fossil Polyphysacean green algae (Chlorophyta, Dasycladales), with notes on the genus Clypeina (Michelin, 1845)

Abstract

Following a preliminary historical survey of the Cenozoic Clypeina marginoporella Michelin, 1845, which is the type species of the respective genus, and of the Mesozoic Clypeina sulcata (Alth, 1882), the point was made that these two species may not be ascribed to the same genus. Accordingly, the new genus Aloisalthella is introduced with Clypeina sulcata as type-species. In addition, the generic diagnosis of Clypeina is amended (i.e., shortened) in order to exclude all features that are not present in its type, e.g., there are no verticils of sterile laterals inserted between successive verticils of fertile laterals. A rather large collection of algae was used to illustrate some key characteristics of these algal taxa as well as a few features rarely observed in C. sulcata.

Carbonate Clasts From Cretaceous Conglomerate Deposits of the Postăvaru Massif (Southern Carpathians, Romania) – Depositional Environments and Biostratigraphic Remarks

“…Lower Cretaceous shallow water microfossils characterize clast category C. The vast majority of these microfossils have a long stratigraphic distribution. Aloisalthella sulcata was described from Kimmeridgian-Berriasian deposits (Bassoullet, 1997;Bucur, 1999;Mircescu et al, 2014;Granier & Lethiers, 2019). Protopeneroplis ultragranulata is known from middle Tithonian-Barremian deposits with high frequency in Berriasian-Valanginian carbonate rocks (Altiner, 1991;Bucur, 1997).…”

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“…The large distance between successive whorls leads to a rare potential of preservation within the succession (see the example of Clypeina besici Pantić in Granier & Deloffre, 1994(Pantić, 1965), or Clypeina helvetica Morellet & Morellet, 1918from Eocene (cf. Schlagintweit et al, 2013; see also Clypeina in Genot, 1980;2009, andLethier, 2019). By contrast, Heteroporella?…”