Polysphaeridium tribrachiosum
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"?tribrachiosum" (Tasch in Tasch et al., 1964, p.195, pl.1, fig.3) Davey and Williams, 1969, p.7. Holotype: Tasch et al., 1964, pl.1, fig.3. Originally Hystrichosphaeridium, subsequently Polysphaeridium?. Questionable assignment: Davey and Williams (1969, p.7). Taxonomic senior synonym: Hystrichosphaeridium (as and now Kiokansium) unituberculatum, according to Stover and Evitt (1978, p.76). This combination was not validly published in Davey and Williams (1966b, p.95), since these authors did not fully reference the basionym. Age: Albian.
Parent: Polysphaeridium