From Fensome et al., 2019:
Subtilisphaera crassigranulosa Jain and Millepied, 1973, p.28, pl.2, fig.25. Holotype: Jain and Millepied, 1973, pl.2, fig.25 (centre of plate). This name was listed incorrectly as invalid in Fensome and Williams (2004, p.637). Age: Aptian.

---------------------------------------------------------------------------------------------------
Original description [Jain and Millepied, 1973]:

Subtilisphaera crassigranulosa sp. nov.
PI. 2, Fig. 25

Holotype - PI. 2, Fig. 25; Slide No. 7300-4.
Type locality - Bore Hole No. BR-1, Senegal, N.W. Africa.
Horizon - Aptian.

Diagnosis - Shell small, biconical, lateral sides convex, periphragm thin, coarsely granular, divided by a well developed girdle into two almost equal halves. Epitract with one apical horn, broader than long; hypotract broadly rounded, periphragm extends to form two unequal horns. Capsule completely fills the pcripnragm, endopnragm smooth.

Dimensions
Holotype - Shell-length 54 μ, breadth 43 μ;
Capsule-length 45 μ, breadth 45 μ;
Apical horn-length 5·2 μ; breadth 20 μ;
Antapical horn-length 5·2 μ, breadth 5·2 μ.
Observed range - Shell-length 50-60 μ, breadth 40-50 μ;
Capsule-diameter 40-50 μ;
Antapical horn-length 5·8 μ; breadth 5-12 μ.

Comparison - S. crassigranulosa sp. nov., differs from all the known species of the genus in its coarsely granular periphragm.