Hystrichosphaeropsis minimum

"minimum" Zevenboom and Santarelli in Zevenboom, 1995, p.144, pl.5, figs.5,7,9. Holotype: Zevenboom, 1995, pl.5, figs.5,7,9. Name not validly published: considered a manuscript name. Age: latest Late Oligocene-Early Miocene.