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Laciniadinium tianshanense
Laciniadinium tianshanense (He Chengquan, 1991) Lentin and Williams, 1993
Originally Sinocysta, subsequently (and now) Laciniadinium.
Holotype: He Chengquan, 1991, pl.2, fig.8
Age: Late Eocene
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: The cyst is dorsal-ventral flatened, outline peridinioid, length larger than width; Upper cyst is slightly larger than the lower cyst, conical, side edge straight; Apical horn is not developed, low-conical, top circle, length 5μm or so. Lower cyst is inverted trapezoid, antapex edge a little concave, two horns, horns are convex, and sometimes one of them can be blunt conical. Cingulum clear, shallow flat, ring form, width 6-7μm, partial to the lower cyst, decorated with fine ridges on the edge. Sulcus slightly subsidence, limited to the lower cyst. Very thin cyst wall, light color, smooth surface - nearly smooth, partially with weak longitudinal streaks. Archeopyle large, combined, (tl3P)a type, characterized by the regular arched archeopyle main crack, paratabulation is not contained in the composition of the archeopyle. Operculum preserved in situ. Several small yellow-green cores on ventral surface. Cyst length 48-52.5μm, width 32. 5-40μm (measured 2); Holotype length 48μm, width 32.5μm, cingulum width 7μm, the apical horn length 5μm.
Location and stratigraphy: Ulugqat County Basebulak; Basebulak fm member two and three.
Originally Sinocysta, subsequently (and now) Laciniadinium.
Holotype: He Chengquan, 1991, pl.2, fig.8
Age: Late Eocene
Description from He Chengquan, 1991, translated by Suning Hou, 07-01-2019
Description: The cyst is dorsal-ventral flatened, outline peridinioid, length larger than width; Upper cyst is slightly larger than the lower cyst, conical, side edge straight; Apical horn is not developed, low-conical, top circle, length 5μm or so. Lower cyst is inverted trapezoid, antapex edge a little concave, two horns, horns are convex, and sometimes one of them can be blunt conical. Cingulum clear, shallow flat, ring form, width 6-7μm, partial to the lower cyst, decorated with fine ridges on the edge. Sulcus slightly subsidence, limited to the lower cyst. Very thin cyst wall, light color, smooth surface - nearly smooth, partially with weak longitudinal streaks. Archeopyle large, combined, (tl3P)a type, characterized by the regular arched archeopyle main crack, paratabulation is not contained in the composition of the archeopyle. Operculum preserved in situ. Several small yellow-green cores on ventral surface. Cyst length 48-52.5μm, width 32. 5-40μm (measured 2); Holotype length 48μm, width 32.5μm, cingulum width 7μm, the apical horn length 5μm.
Location and stratigraphy: Ulugqat County Basebulak; Basebulak fm member two and three.