Polysphaeridium perovatum
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"?perovatum" (Tasch in Tasch et al., 1964, p.194, pl.3, fig.13) Davey and Williams, 1969, p.6. Holotype: Tasch et al., 1964, pl.3, fig.13. Originally Hystrichosphaeridium, subsequently Polysphaeridium?. Taxonomic senior synonym: Hystrichosphaeridium (as and now Kiokansium) unituberculatum, according to Stover and Evitt (1978, p.76). Questionable assignment: Davey and Williams (1969, p.6). 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.
Parent: Polysphaeridium
