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Sentusidinium ovatum
From Fensome et al., 2019:
Sentusidinium ?ovatum (Yu Jingxian and Zhang Wangping, 1980) comb. nov. Chytroeisphaeridia ovata Yu Jingxian and Zhang Wangping, 1980, p.106, pl.1, figs.12–13.
Holotype: Yu Jingxian and Zhang Wangping, 1980, pl.1, fig.13. Originally Chytroeisphaeridia, subsequently Escharisphaeridia?, thirdly (and now) Sentusidinium?. Here we propose the combination Sentusidinium? ovatum as the genus Escharispheridia is now considered a taxonomic junior synonym of Sentusidinium; we do so questionably following its questionable assignment to Escharisphaeridia by He Chengquan et al. (2009, p.224). Age: Late Cretaceous.
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Original description Chytroeisphaeridia ovata sp. nov Yu Jingxian and Zhang Wangping, 1980 [translation Suning Hou 2025]:
Holotype: Slide W3–7 (4), Plate I, Figure 13
Description: Cyst length 45–46µm, Holotype 46µm long. Cyst width 29.9–34.5µm, holotype 34.5µm wide. The dorsal and ventral sides are flat, with an oval contour and a wall thickness of approximately 1.0µm. The surface is densely covered with granular ornamentation. The apex is short and thick, forming an apical archeopyle with a recessed suture line. Along the longitudinal axis of the cyst, elongated folds are often formed.
Comparison: The new species has granular ornamentation, somewhat resembling C. pococki Sarjeant (1966), but can be distinguished by the latter's nearly circular contour and the absence of elongated folds on its surface.
Stratigraphy: Upper part of the Uyitak-Kukbay （乌依塔克–库克拜）Formation
Sentusidinium ?ovatum (Yu Jingxian and Zhang Wangping, 1980) comb. nov. Chytroeisphaeridia ovata Yu Jingxian and Zhang Wangping, 1980, p.106, pl.1, figs.12–13.
Holotype: Yu Jingxian and Zhang Wangping, 1980, pl.1, fig.13. Originally Chytroeisphaeridia, subsequently Escharisphaeridia?, thirdly (and now) Sentusidinium?. Here we propose the combination Sentusidinium? ovatum as the genus Escharispheridia is now considered a taxonomic junior synonym of Sentusidinium; we do so questionably following its questionable assignment to Escharisphaeridia by He Chengquan et al. (2009, p.224). Age: Late Cretaceous.
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Original description Chytroeisphaeridia ovata sp. nov Yu Jingxian and Zhang Wangping, 1980 [translation Suning Hou 2025]:
Holotype: Slide W3–7 (4), Plate I, Figure 13
Description: Cyst length 45–46µm, Holotype 46µm long. Cyst width 29.9–34.5µm, holotype 34.5µm wide. The dorsal and ventral sides are flat, with an oval contour and a wall thickness of approximately 1.0µm. The surface is densely covered with granular ornamentation. The apex is short and thick, forming an apical archeopyle with a recessed suture line. Along the longitudinal axis of the cyst, elongated folds are often formed.
Comparison: The new species has granular ornamentation, somewhat resembling C. pococki Sarjeant (1966), but can be distinguished by the latter's nearly circular contour and the absence of elongated folds on its surface.
Stratigraphy: Upper part of the Uyitak-Kukbay （乌依塔克–库克拜）Formation