Hystrichosphaeropsis arctica
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arctica Matsuoka and Bujak, 1988, p.47–48, pl.5, figs.1a–b,2a–b,3,4a–b. Holotype: Matsuoka and Bujak, 1988, pl.5, figs.1a–b. Age: late Miocene.
Parent: Hystrichosphaeropsis