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Rhombodinium tuberculatum
Rhombodinium tuberculatum He Chengquan, 1991
Holotype: He Chengquan, 1991, pl.37, fig.1
Age: Middle Eocene
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: The cyst is dorsal-ventral flattened , contour kite-shaped, length and width are nearly equal or width larger than the length, the body pentagonal or oval. With a conspicuous apical horn, apex conical, 26-27.5μm, base somewhat constricted, top with a few blunt conical spines (about 2μm); There are 2 unequal antapical horn sat the antapex, conical, end blunt, left antapical horn length 25-27.5μm, right length 16-20μm, both lateral horns are also very developed, cylindrical or base slightly wider, length 25-27.5μm, the width of the middle is 17μm, distally with short rod-spine processes, length around 2.5μm. The cingulum r is very clear on both lateral horns. Outer wall surface with nodules and particles, most nodules are low-circular, hollow, variable size, diameter 1-2.5μm, usually in the distal end of the horns the nodules are slightly higher, or forming rod tumors, 2μm long, the tumor distribution did not show any regularity. Inner body is oval or nearly oval, more or less protruding into both lateral horns, the wall is thin, the surface is smooth;It is separated from the outer wall, except at the horns, outer cavity on the lateral side is 0-2μm wide. Archeopyle intercalary, the outline is trapezoid, length larger than width. The operculum is completely separated and stored in place. The cyst length 140-142.5μm, width 142-145μm, inner body length 90-95μm, width 85-90μm (measured 2); Holotype length 142μm, width 142 μm, inner body length 90μm, width 85μm, apical horn length 27.5μm, left antapical horn length 27.5μm , right one length 20μm , lateral horns length 25μm.
Location and stratigraphy: Wucha County Basebulak; Wulagen fm.
Holotype: He Chengquan, 1991, pl.37, fig.1
Age: Middle Eocene
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: The cyst is dorsal-ventral flattened , contour kite-shaped, length and width are nearly equal or width larger than the length, the body pentagonal or oval. With a conspicuous apical horn, apex conical, 26-27.5μm, base somewhat constricted, top with a few blunt conical spines (about 2μm); There are 2 unequal antapical horn sat the antapex, conical, end blunt, left antapical horn length 25-27.5μm, right length 16-20μm, both lateral horns are also very developed, cylindrical or base slightly wider, length 25-27.5μm, the width of the middle is 17μm, distally with short rod-spine processes, length around 2.5μm. The cingulum r is very clear on both lateral horns. Outer wall surface with nodules and particles, most nodules are low-circular, hollow, variable size, diameter 1-2.5μm, usually in the distal end of the horns the nodules are slightly higher, or forming rod tumors, 2μm long, the tumor distribution did not show any regularity. Inner body is oval or nearly oval, more or less protruding into both lateral horns, the wall is thin, the surface is smooth;It is separated from the outer wall, except at the horns, outer cavity on the lateral side is 0-2μm wide. Archeopyle intercalary, the outline is trapezoid, length larger than width. The operculum is completely separated and stored in place. The cyst length 140-142.5μm, width 142-145μm, inner body length 90-95μm, width 85-90μm (measured 2); Holotype length 142μm, width 142 μm, inner body length 90μm, width 85μm, apical horn length 27.5μm, left antapical horn length 27.5μm , right one length 20μm , lateral horns length 25μm.
Location and stratigraphy: Wucha County Basebulak; Wulagen fm.