Polysphaeridium "?fabium" (Tasch in Tasch et al., 1964, p.195, pl.2, fig.5) Davey and Williams, 1969, p.6. Holotype: Tasch et al., 1964, pl.2, fig.5. Originally Hystrichosphaeridium, subsequently Polysphaeridium?. Questionable assignment: Davey and Williams (1969, p.6). Taxonomic senior synonym: Hystrichosphaeridium (as and now Kiokansium) unituberculatum, according to Stover and Evitt (1978, p.76). This combination, as a questionable assignment, was not validly published in Davey and Williams (1966b, p.95), since these authors did not fully reference the basionym. Age: Albian.