Apteodinium variabile, He Chengquan, 1991

Holotype: He Chengquan, 1991, pl.3, fig.11.
Location and stratigraphy: Wuqia County Urukqiati, the middle of the Kukebai fm; Basebulak, lower Qimugen fm and Wulagen fm.
Age: Cenomanian-Eocene

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Original description: [He Chengquan, 1991]: (translated by Suning Hou, 07-01-2019):

Description:
The cyst has a long oval - cylindrical shape, waist not convex, divided into equal or unequal members by the cingulum. Upper cyst (sometimes larger) conical or bell-shaped, usually with a slightly less centered short apical horn, horn straight or bend, shape variable, conical, cylindrical or irregular shape, length 2-10μm, hypocyst high arched, lack of antapical horn.
Cingulum equatorial position or deviating to the lower cyst, shallow concave on the sides, annular, width 5-7.5μm, the edges are marked by weak ridges.
Lack of sulcus.
Thin wall, surface granular- short wrinkle, usually showing the corroded irregular reticular wrinkles, and sometimes irregular knife-shaped wrinkle.
The archeopyle is generally not easy to see, in some specimens it seems to be precingular, P type.

Dimensions:
Cyst length 80-87μm, width 70μm (measured 8);
Holotype length 87μm, width 70μm, waist width 5μm.