Batiacasphaera cooperi, Hannah et al., 1998, p.534-535, figs.4j-k.

Questionable assignment: Clowes et al., 2016, p.80. Clowes et al. (2016, p.80) implied that this species might be a taxonomic synonym of Brigantedinium pynei.

Holotype: Hannah et al., 1998, figs.4j-k (not figs.5a-b, as indicated in Hannah et al., 1998, p.534).
Distribution: single appearance at 2 1.04 mbsf (?reworked), otherwise restricted to the Miocene part of the section below 85.36 mbsf.
Age: Miocene.

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Hannah et al., 1998]:

Description:
Shape: large, subspherical.
Phragma: autophragm covered with a dense reticulum. Muri thick but lumen variable in width. No paratabulation indicated by wall features.
Archaeopyle: large apical archaeopyle, operculum detached. Margins of the archaeopyle often indistinct due to cyst damage. No detached opercula found.

Dimensions/Size:
diameter =63(73)84 µm, based on six specimens.

Affinities:
species differs from Batiacasphaera cassiciila Wilson (1988) by having a coarser more variable reticulum