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Phthanoperidinium ovoideum
Phthanoperidinium ovoideum He Chengquan, 1991
Holotype: He Chengquan, 1991, pl.2, fig.14; text-fig.8
Age: Late Eocene
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: The cyst is small, outline oval, length and width nearly the same. Upper cyst slightly larger than the lower cyst, no apical antapical horns, but with a top hole. Cingulum narrow, width 5μm, micro-spiral. Sulcus slightly concave, extending to the upper cyst, no plates on it. Paratabulation is 4', 3a, 7", 6c, 5'’', 2""; The plates (including the cingulum) boundaries are marked by fine ridges, which partially reflect the boundaries of the plate, especially the preservation of the lower cyst is not clear enough. Thin cyst wall, the surface is fine or nearly smooth. The archeopyle was not seen, but undoubtedly intercalary, type I (only 2a). Cyst length 30-47μm, width 30-45μm, (measured 2); Holotype length 47μm1 width 45μm
Location and stratigraphy: Ulugqat County Basebulak; Basebulak fm member two and three.
Holotype: He Chengquan, 1991, pl.2, fig.14; text-fig.8
Age: Late Eocene
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: The cyst is small, outline oval, length and width nearly the same. Upper cyst slightly larger than the lower cyst, no apical antapical horns, but with a top hole. Cingulum narrow, width 5μm, micro-spiral. Sulcus slightly concave, extending to the upper cyst, no plates on it. Paratabulation is 4', 3a, 7", 6c, 5'’', 2""; The plates (including the cingulum) boundaries are marked by fine ridges, which partially reflect the boundaries of the plate, especially the preservation of the lower cyst is not clear enough. Thin cyst wall, the surface is fine or nearly smooth. The archeopyle was not seen, but undoubtedly intercalary, type I (only 2a). Cyst length 30-47μm, width 30-45μm, (measured 2); Holotype length 47μm1 width 45μm
Location and stratigraphy: Ulugqat County Basebulak; Basebulak fm member two and three.