Back
Paucisphaeridium inversibuccinum subsp. inversibuccinum
Paucisphaeridium 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.
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.
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.
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.