Batiacasphaera extravermiculata, Shaw Chenglong, 1999b, p.183-185, figs.87-95.

Holotype: Shaw Chenglong, 1999b, figs.87-89.
Stratigraphic occurrence: Eocene (OK-1 well 1788m).
Age: Eocene.

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Original description: [Shaw Chenglong, 1999b]:

Description: Cysts spherical, subspherical or lenticular with a characteristic condensed extravermiculare surface and thick autophragm (4-5 μm thick); lateral view of the cyst scabrate; apical archeopyle, operculum generally free, occasionally remains in place; about 26 μm wide.
No indications of paratabulation, paracingulum or parasulcus.

Dimensions:
Holotype – Overall diameter 50 μm, autophragm 4-5- μm thick, apical archeopyle 26 μm wide.
Other specimens - Overall diameter 38-52 μm, autophragm 2.5-5 μm thick, apical archeopyle, 16-28 μm wide. (n=22).

Remarks:
The species differs from Batiacasphaera cassicuka Wilson 1988 in being substantially smaller and in having an extravermiculate processes