Bacchidinium polypes subsp. clavulum

"subsp. clavulum" (Davey, 1969a, p.154–155, pl.6, figs.9–10) Lentin and Williams, 1981, p.24.  Holotype: Davey, 1969a, pl.6, fig.9; Fauconnier and Masure, 2004, pl.50, fig.1.  NOW Impletosphaeridium? clavulum.  Originally Cleistosphaeridium polypes var. clavulum, subsequently Cleistosphaeridium polypes subsp. clavulum, thirdly Impletosphaeridium polypes subsp. clavulum, fourthly Bacchidinium polypes subsp. clavulum, fifthly Cleistosphaeridium clavulum, sixthly Impletosphaeridium clavulum, seventhly (and now) Impletosphaeridium? clavulum.  This combination was not validly published in Davey (1979b, p.553), since that author did not fully reference the basionym.  Age: Cenomanian.

Parent: Bacchidinium polypes