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Rhombodinium rotundatum
From Fensome et al., 2019:
Rhombodinium ?rotundatum Balteş, 1969, p.35, pl.5, fig.10 ex Lentin and Williams, 1973, p.121. Holotype: Balteş, 1969, pl.5, fig.10. Originally Wetzeliella (name not validly published), subsequently (and now) Rhombodinium. Questionable assignment: Williams et al. (2015, p.311). Taxonomic junior synonym (at specific rank): Rhombodinium draco forma freienwaldense (as Rhombodinium freienwaldense), by implication in Costa and Downie (1979, p.44), who believed Rhombodinium freienwaldense to be the senior name — however, Grabowska in Malinowskiej and Piwockiego (1996, p.343) retained Rhombodinium freienwaldense. This name was not validly published in Balteş (1969) since that author considered it a provisional designation. Age: Oligocene.
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Original description (Baltes, 1969) Translation from PKB 2025:
Descroption: Rhomboidal cyst, total length 140–160 microns, width 120–126 microns. Apical and especially lateral horns considerably rounded. Antapical horn, however, molding two slight prominences. No processes. Outer membrane smooth or finely granulated. Endophragm with an ovoid outline, occupying almost the entire internal cavity. Age and locality: Oligocene marls and sands of the Precarpathian Depression, Rm. Vilcea (Muiereasca) zone.
Rhombodinium ?rotundatum Balteş, 1969, p.35, pl.5, fig.10 ex Lentin and Williams, 1973, p.121. Holotype: Balteş, 1969, pl.5, fig.10. Originally Wetzeliella (name not validly published), subsequently (and now) Rhombodinium. Questionable assignment: Williams et al. (2015, p.311). Taxonomic junior synonym (at specific rank): Rhombodinium draco forma freienwaldense (as Rhombodinium freienwaldense), by implication in Costa and Downie (1979, p.44), who believed Rhombodinium freienwaldense to be the senior name — however, Grabowska in Malinowskiej and Piwockiego (1996, p.343) retained Rhombodinium freienwaldense. This name was not validly published in Balteş (1969) since that author considered it a provisional designation. Age: Oligocene.
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Original description (Baltes, 1969) Translation from PKB 2025:
Descroption: Rhomboidal cyst, total length 140–160 microns, width 120–126 microns. Apical and especially lateral horns considerably rounded. Antapical horn, however, molding two slight prominences. No processes. Outer membrane smooth or finely granulated. Endophragm with an ovoid outline, occupying almost the entire internal cavity. Age and locality: Oligocene marls and sands of the Precarpathian Depression, Rm. Vilcea (Muiereasca) zone.