Back
Polysphaeridium pastielsii
Polysphaeridium pastielsii Davey and Williams, 1966
NOW Dapsilidinium. Originally Polysphaeridium, subsequently (and now) Dapsilidinium.
Taxonomic junior synoym: Polysphaeridium (now Dapsilidinium) pseudocolligerum according to Mertens et al. (2014, p.532) — however, Fensome et al., in press retained Dapsilidinium pseudocolligerum as a separate species.
Holotype: Davey and Williams, 1966b, pl.4, fig.10; Eisenack and Kjellström, 1972, p.923; Bujak et al., 1980, pl.6, figs.6,9; Fensome et al., 1995, fig.1 — p.1647; Fauconnier and Masure, 2004, pl.19, figs.17–19.
Locus typicus: London Clay, Kent, England
Stratum typicum: Early Eocene
Original diagnosis: Davey and Williams, 1966, p. 93
Ovoidal central body with smooth or granular surface. Apical archaeopyle with zig-zag margin. Processes numerous, all of one type; simple open, tapering distally to narrow neck before spreading slightly to an opening with entire or serrate margin. Processes sometimes united proximally, slightly fibrous.
Dimensions: holotype: diameter of central body 37-43 µm, length of processes 10-14 µm. Range: diameter of central body 31-43 µm, length of processes up to 19 µm.
Original description: Davey and Williams, p. 93
The processes broaden proximally, often quite considerably, and may measure up to 9 µm in width but the latter is very variable. An apical archaeopyle is present.
NOW Dapsilidinium. Originally Polysphaeridium, subsequently (and now) Dapsilidinium.
Taxonomic junior synoym: Polysphaeridium (now Dapsilidinium) pseudocolligerum according to Mertens et al. (2014, p.532) — however, Fensome et al., in press retained Dapsilidinium pseudocolligerum as a separate species.
Holotype: Davey and Williams, 1966b, pl.4, fig.10; Eisenack and Kjellström, 1972, p.923; Bujak et al., 1980, pl.6, figs.6,9; Fensome et al., 1995, fig.1 — p.1647; Fauconnier and Masure, 2004, pl.19, figs.17–19.
Locus typicus: London Clay, Kent, England
Stratum typicum: Early Eocene
Original diagnosis: Davey and Williams, 1966, p. 93
Ovoidal central body with smooth or granular surface. Apical archaeopyle with zig-zag margin. Processes numerous, all of one type; simple open, tapering distally to narrow neck before spreading slightly to an opening with entire or serrate margin. Processes sometimes united proximally, slightly fibrous.
Dimensions: holotype: diameter of central body 37-43 µm, length of processes 10-14 µm. Range: diameter of central body 31-43 µm, length of processes up to 19 µm.
Original description: Davey and Williams, p. 93
The processes broaden proximally, often quite considerably, and may measure up to 9 µm in width but the latter is very variable. An apical archaeopyle is present.