From Fensome et al., 2019:
Triblastula tubulata Wetzel, 1961, p.340, pl.2, fig.4.
Holotype: Wetzel, 1961, pl.2, fig.4.
Originally Triblastula, subsequently Hystrichosphaeropsis.
Taxonomic senior synonym: Triblastula (as and now Hystrichosphaeropsis) quasicribrata, according to Marheinecke (1992, p.44).

Locus typicus: Feuerstein-Einschluß, Senonian
Stratum typicum: Erratikum ?Late Cretaceous

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Original diagnosis: O. Wetzel, 1961, p.340
Overall appearance slender, the tripartition less abrupt then in Triblastula nuda O. Wetzel; like that form, it also lacks bristles. The two "pole-caps" narrowly embrace the equatorial circle of the central sphere and are drawn out with somewhat concave outlines in opposite directions; one (the "epitheca") ends in a short, humplike "apex", but the other remains cylindrical, like a truncated tube. A pylome appears to be present below the "apex"; in other respects the fossil is not sufficiently transparent to permit further observations.
Dimensions: 80 x 45 µm.