Paucisphaeridium inversibuccinum subsp. inversibuccinum

subsp. inversibuccinum.  Autonym.  Holotype: Davey and Williams, 1966b, pl.12, fig.3; Eisenack and Kjellström, 1972, p.781; Bujak et al., 1980, pl.2, figs.4-5; Fensome et al., 1995, fig.1 - p.1567; Fauconnier and Masure, 2004, pl.63, fig.1.  Age: Early Eocene. Parent: Paucisphaeridium inversibuccinum