From Fensome et al., 2019:
Batiacasphaera extravermiculata (Shaw Chenglong, 1999b, p.183–185, figs.87–95) Wood et al., 2016, p.85. Holotype: Shaw Chenglong, 1999b, figs.87–89. Originally Batiacasphaera, subsequently (and now) Sentusidinium. Taxonomic
junior synonym: Batiacasphaera granulata, according to Wood et al. (2016, p.85). Age: Eocene.

---------------------------------------------------------------------------------------------------

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