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Paucisphaeridium inversibuccinum
Paucisphaeridium inversibuccinum (Davey and Williams, 1966b, p.82, pl.12, fig.3) Bujak et al., 1980, p.32. Emendation: Bujak et al., 1980, p.32, as Paucisphaeridium inversibuccinum.
Originally Litosphaeridium?, subsequently (and now) Paucisphaeridium.
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.
Locus typicus: Enbourne, Berkshire, England
Stratum typicum: Early Eocene
Original diagnosis: Davey and Williams, 1966, p. 82: Litosphaeridium? inversibuccinum
Sub-sphaerical or ovoidal central body, not exceeding 20 µm. An apical tetragonal archaeopyle was seen in one specimen, the archaeopyle being surrounded by by 6 precingular processes. However the remaining tabulation is obscure.
Emended diagnosis: Bujak in Bujak et al., 1980, p. 32
Chorate cysts with a spherical to subspherical central body of less than 20 µm.
The processes are proximally expanded and hollow, constricted near the distal end and are expanded distally with a denticulate or aculeate margin. Processes may be proximally connected within the precingular and postcingular series. Process length is 4 to 12 µm. Process formula is ?4", 6", Oc, 6""", O"""", xs. When present the sulcal processes are slender. Archaeopyle apical, presumably tetratabular. Operculum detached and not observed.
Originally Litosphaeridium?, subsequently (and now) Paucisphaeridium.
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.
Locus typicus: Enbourne, Berkshire, England
Stratum typicum: Early Eocene
Original diagnosis: Davey and Williams, 1966, p. 82: Litosphaeridium? inversibuccinum
Sub-sphaerical or ovoidal central body, not exceeding 20 µm. An apical tetragonal archaeopyle was seen in one specimen, the archaeopyle being surrounded by by 6 precingular processes. However the remaining tabulation is obscure.
Emended diagnosis: Bujak in Bujak et al., 1980, p. 32
Chorate cysts with a spherical to subspherical central body of less than 20 µm.
The processes are proximally expanded and hollow, constricted near the distal end and are expanded distally with a denticulate or aculeate margin. Processes may be proximally connected within the precingular and postcingular series. Process length is 4 to 12 µm. Process formula is ?4", 6", Oc, 6""", O"""", xs. When present the sulcal processes are slender. Archaeopyle apical, presumably tetratabular. Operculum detached and not observed.