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Paucisphaeridium inversibuccinum subsp. bipolare
Paucisphaeridium inversibuccinum subsp. bipolare de Coninck, 1986b, p.17, pl.6, figs.31–32,40–41 ex Masure and Courtinat in Fauconnier and Masure, 2004, p.437.
Originally Paucisphaeridium inversibuccinum forma bipolare (name not validly published), subsequently (and now) Paucisphaeridium inversibuccinum subsp. bipolare.
The name Paucisphaeridium inversibuccinum forma bipolare was not validly published in de Coninck (1986b) since no holotype was designated.
Holotype: de Coninck, 1986b, pl.6, figs.31–32, designated by Masure and Courtinat in Fauconnier and Masure (2004, p.437); Fauconnier and Masure, 2004, pl.63, figs.2–7.
Age: middle Eocene–early Oligocene (Bartonian–Tongrian).
Original description (De Coninck, 1986)
Remarks: This form differs from the holotype (Davey & Williams, 1966b, p. 82, pl. 12, fig. 3) in the bipolar distribution of the processes: six to seven around the apical pole and six around the antapical pole. Eaton recorded a similar form with processes distributed in a precingular and postcingular series, among the specimens recovered from the Bracklesham Beds. In my material other specimens do not show such a marked bipolar distribution and show more resemblence to the species holotype. For that reason I propose the forma bipolaris for the specimens with marked bipolar ornamentation.
Originally Paucisphaeridium inversibuccinum forma bipolare (name not validly published), subsequently (and now) Paucisphaeridium inversibuccinum subsp. bipolare.
The name Paucisphaeridium inversibuccinum forma bipolare was not validly published in de Coninck (1986b) since no holotype was designated.
Holotype: de Coninck, 1986b, pl.6, figs.31–32, designated by Masure and Courtinat in Fauconnier and Masure (2004, p.437); Fauconnier and Masure, 2004, pl.63, figs.2–7.
Age: middle Eocene–early Oligocene (Bartonian–Tongrian).
Original description (De Coninck, 1986)
Remarks: This form differs from the holotype (Davey & Williams, 1966b, p. 82, pl. 12, fig. 3) in the bipolar distribution of the processes: six to seven around the apical pole and six around the antapical pole. Eaton recorded a similar form with processes distributed in a precingular and postcingular series, among the specimens recovered from the Bracklesham Beds. In my material other specimens do not show such a marked bipolar distribution and show more resemblence to the species holotype. For that reason I propose the forma bipolaris for the specimens with marked bipolar ornamentation.