Hystrichokolpoma cinctum subsp. turgidum
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subsp. turgidum (Williams and Downie, 1966a, p.178–179, pl.17, fig.5) Lentin and Williams, 1985, p.173. Holotype: Williams and Downie, 1966a, pl.17, fig.5. Originally Hystrichokolpoma eisenackii var. turgidum, subsequently Hystrichokolpoma eisenackii subsp. turgidum, thirdly Hystrichokolpoma bulbosum subsp. turgidum, fourthly (and now) Hystrichokolpoma cinctum subsp. turgidum. Age: early Eocene.
Parent: Hystrichokolpoma cinctum