Hystrichosphaeridium duplum subsp. duplum
From dinoflaj3
"subsp. duplum". Autonym. Holotype: White, 1842, pl.4, fig.12. Name illegitimate: the species name is illegitimate. Originally Hystrichosphaeridium palmatum subsp. palmatum (combination illegitimate), subsequently Hystrichosphaeridium duplum subsp. duplum (name illegitimate). Age: Senonian.
Parent: Hystrichosphaeridium duplum