Hystrichosphaeridium heteracanthum subsp. sparsiprocessum
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"subsp. sparsiprocessum" Varma and Dangwal, 1964, p.64, pl.1, fig.7. Holotype: Varma and Dangwal, 1964, pl.1, fig.7. NOW Heterosphaeridium heteracanthum? subsp. sparsiprocessum. Originally Hystrichosphaeridium heteracanthum subsp. sparsiprocessum, subsequently Heterosphaeridium heteracanthum subsp. sparsiprocessum, thirdly Heterosphaeridium? heterocanthum subsp. sparsiprocessum, fourthly (and now) Heterosphaeridium heteracanthum? subsp. sparsiprocessum. Age: Eocene–Oligocene.
Parent: Hystrichosphaeridium heteracanthum