Paucisphaeridium inversibuccinum forma bipolare
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"forma bipolare" de Coninck, 1986b, p.17, pl.6, figs.31–32,40–41. Name not validly published: holotype not designated. NOW Paucisphaeridium inversibuccinum subsp. bipolare. Originally Paucisphaeridium inversibuccinum forma bipolare (name not validly published), subsequently (and now) Paucisphaeridium inversibuccinum subsp. bipolare. Age: middle Eocene–early Oligocene (Bartonian–Tongrian).
Parent: Paucisphaeridium inversibuccinum