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Pentadinium taeniagerum ssp. imaginatum
Pentadinium taeniagerum ssp. imaginatum Benedek, 1972; Emendation: Benedek et al., 1982, p.279,281, as Toenisbergia imaginata.
Originally (and now) Pentadinium taeniagerum subsp. imaginatum, subsequently Toenisbergia imaginatum. Lentin and Williams (1985, p.279) retained this taxon as Pentadinium laticinctum subsp. imaginatum.
Taxonomic junior synonym: Pentadinium laticinctum subsp. imaginatum, according to Benedek et al. (1982, p.279) — however, Lentin and Williams (1985, p.279) retained Pentadinium laticinctum subsp. imaginatum.
Holotype: Benedek, 1972, pl.6, figs.12a–b; Eisenack and Kjellström, 1975a; Benedek et al., 1982, figs.7A,C,E,8C–D (not 8A–B); Fensome et al., 1995, figs.1–4 — p.1557.
Age: Late Oligocene
Emended diagnosis: Benedek et al., 1982, p. 21-22
Cyst circumcavate. Periblast rounded-hexagonal in polar view (with a marked sulcal indentation), irregularly subpolygonal in ambitus, with outbulges at the apex and equator and with antapex rather flat. Endoblast ovoidal to rounded-subpolygonal, thick and two-layered (mesophragm + endophragm). Horns absent; crests and processes lacking. Cingulum not clearly defined, but faintly suggested by equatorial folding: sulcus not readily visible in lateral view, but clearly indicated in polar view by the ventral inbulge of the periblast. Archaeopyle intercalary (type I/I); very large in the periblast, with archaeopyle index greater than 0.5, somewhat smaller proportionately in the endoblast. Surface of periphragm lightly granular; endoblast apparently punctate, surface of mesophragm granular.
Originally (and now) Pentadinium taeniagerum subsp. imaginatum, subsequently Toenisbergia imaginatum. Lentin and Williams (1985, p.279) retained this taxon as Pentadinium laticinctum subsp. imaginatum.
Taxonomic junior synonym: Pentadinium laticinctum subsp. imaginatum, according to Benedek et al. (1982, p.279) — however, Lentin and Williams (1985, p.279) retained Pentadinium laticinctum subsp. imaginatum.
Holotype: Benedek, 1972, pl.6, figs.12a–b; Eisenack and Kjellström, 1975a; Benedek et al., 1982, figs.7A,C,E,8C–D (not 8A–B); Fensome et al., 1995, figs.1–4 — p.1557.
Age: Late Oligocene
Emended diagnosis: Benedek et al., 1982, p. 21-22
Cyst circumcavate. Periblast rounded-hexagonal in polar view (with a marked sulcal indentation), irregularly subpolygonal in ambitus, with outbulges at the apex and equator and with antapex rather flat. Endoblast ovoidal to rounded-subpolygonal, thick and two-layered (mesophragm + endophragm). Horns absent; crests and processes lacking. Cingulum not clearly defined, but faintly suggested by equatorial folding: sulcus not readily visible in lateral view, but clearly indicated in polar view by the ventral inbulge of the periblast. Archaeopyle intercalary (type I/I); very large in the periblast, with archaeopyle index greater than 0.5, somewhat smaller proportionately in the endoblast. Surface of periphragm lightly granular; endoblast apparently punctate, surface of mesophragm granular.