From Fensome et al., 2019:
Achomosphaera alcicornu forma columnaeformis, Aristova, 1971, p.117–118, pl.1, fig.2.
Holotype: Aristova, 1971, pl.1, fig.2.
NOW Achomosphaera alcicornu subsp. columnaeformis.
Originally Achomosphaera alcicornu forma columnaeformis, subsequently (and now) Achomosphaera alcicornu subsp. columnaeformis.
Age: Eocene.

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