Clypeina teakolarae sp. nov., a dasycladalean alga from Lower Eocene of Rakitovec (Čičarija, Slovenia)

Abstract

A new species, Clypeina teakolarae, is described from the Lower Eocene of ^i~arija, in Slovenia. The pattern of calcification, known so far only from the Upper Jurassic and the Lower Cretaceous, is structurally equal to that of the Clypeina jurassica group of species, having an intracellular, radial-fibrous calcite infilling and a micritic cell wall. Contrary to other species of the C. jurassica group, the main stem of the new taxon consists of spaced out twinwhorls bearing numerous, commonly irregularly arranged laterals. Izvle~ekIz spodnjeeocenskih plasti ^i~arije v Sloveniji je opisana nova vrsta dazikladaceje Clypeina teakolarae. Kalcifikacija vrste je strukturno enaka kot pri algah grupe Clypeina jurassica po tem, da ima intracelularno fibroznoradialno kalcifikacijo in kalcitno-mikritno celi~no steno. Od vrst te grupe se razlikuje po steljki (talusu), na kateri si v presledkih sledita po dve skupaj leže~i vretenci (dvoj~ka) s {tevilnimi, pretežno nepravilno postavljenimi vejicami.

Clypeina tibanai, sp. nov. (Polyphysacea, Dasycladales, Chlorophyta), mid-Cretaceous green alga fro

“…Morellet, 1922, a junior synonym of Clypeina digitata (Parker & Jones, 1860) • C. somalica Conrad et al, 1983, transferred to genus Holosporella Pia, 1930 to Similiclypeina in the opinion of Bucur (1993) • C. ? teakolarae Radoičić et al, 2011(transferred to Falsolikanella Granier, 1987a, by Sokač et al (2012).…”

Clypeina helvetica Morellet and Morellet, 1918, revisited. A Priabonian (Late Eocene) dasycladalean alga from the Diablerets Nappe of the Helvetic Alps, southwestern Switzerland

“…Clypeina? teakolarae, for instance, exhibits spaced double verticils (= twin whorls sensu Radoičić et al 2011), which are incompatible with the spaced single whorls displayed by Clypeina (e.g., Génot 2009, fig. 2).…”

“…9b). Given that Clypeina jurassica is the most widespread and well-known species of all these, Radoičić et al (2011) referred to them to as the ''Clypeina jurassica group''. With respect to these examples, one could get the impression that this calcification pattern is restricted to the genus Clypeina, which is not the case.…”