Hystrichosphaeropsis nuda
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"nuda" (Wetzel, 1961, p.340, pl.2, fig.2) Sarjeant, 1985b, p.140. Holotype: Wetzel, 1961, pl.2, fig.2. Originally Triblastula, subsequently Hystrichosphaeropsis. Taxonomic senior synonym: Triblastula (as Hystrichosphaeropsis) quasicribrata, according to Marheinecke (1992, p.44). Age: ?Late Cretaceous (erratic).
Parent: Hystrichosphaeropsis