Hystrichosphaeridium complex (White, 1842) Deflandre, 1946

Now Oligosphaeridium complex. Originally Xanthidium tubiferum var. complex, subsequently Xanthidium complex, thirdly Hystrichosphaeridium complex, fourthly (and now) Oligosphaeridium complex.
Tax. sr. synonym of Hystrichosphaeridium elegantulum Lejeune-Carpentier, 1940, according to Deflandre, 1946.
Tax. sr. synonym of Hystrichosphaeridium himalayense Mehrotra and Sinha, 1981, according to Jain and Garg, 1986.
Tax. sr. synonym of Oligosphaeridium cephalum Sah et al., 1970, according to Lejeune-Carpentier and Sarjeant, 1981, and Jain, 1981.
Tax. sr. synonym of Geodia? irregularis Merrill, 1895, according to Harker and Sarjeant in Harker et al., 1990.

Holotype: White, 1842, pl.4, fig.11 (lost, according to Davey and Williams, 1966)
Neotype: Davey and Williams, 1966, pl.7, fig.1 (designated by Davey and Williams, 1966)
Age: Senonian