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Phthanoperidinium eocenicum
From Fensome et al., 2019:
Pthanoperidinium? eocenicum (Cookson and Eisenack, 1965a, p.119–120, pl.11, figs.1–5) Lentin and Williams, 1973, p.113. Holotype: Cookson and Eisenack, 1965a, pl.11, figs.1–2. Originally Peridinium (Appendix B), subsequently (and now) Phthanoperidinium?. Questionable assignment: Lentin and Williams (1973, p.113). Stover and Evitt (1978, p.119) considered Phthanoperidinium stockmansii and Phthanoperidinium resistente to be possible taxonomic junior synonyms of Phthanoperidinium? eocenicum. Eaton (1976, p.294) also proposed this combination. Age: Late Eocene.
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Locus typicus: Browns Creek Clays, SW. Victoria
Stratum typicum: Late Eocene
Original description: Cookson and Eisenack, 1965, p.119: Peridinium eocenicum
Shell small, oval, tabulated and divided almost equally by a relatively broad, helicoid girdle. Both epitheca and hypotheca with a small, solid horn. Wall of shell finely granular with or without small dot-like thickenings of variable size on the surface of the plates (Pl. 11, fig. 5). The borders of the girdle and the thin transparent ledges of the plates are lightly granular and their edges dotted with evenly spaced granules and small tubercles, or sparsely denticulate. Tabulation is of the Peridinium type, 4'?, 3[a], 7", 5''', 1p, 2''''. Plate 1' is kite-like in shape, the two upper sides of the "rhomb" being shorter than the two lower Plate 1''' is very narrow. Intercalary strips are sometimes evident. The archeopyle is relatively large, hexagonal, and intercalary.
Dimensions: Holotype c. 60 µm long, 40 µm broad. Range c. 48-62 µm long 33-48 µm broad.
Pthanoperidinium? eocenicum (Cookson and Eisenack, 1965a, p.119–120, pl.11, figs.1–5) Lentin and Williams, 1973, p.113. Holotype: Cookson and Eisenack, 1965a, pl.11, figs.1–2. Originally Peridinium (Appendix B), subsequently (and now) Phthanoperidinium?. Questionable assignment: Lentin and Williams (1973, p.113). Stover and Evitt (1978, p.119) considered Phthanoperidinium stockmansii and Phthanoperidinium resistente to be possible taxonomic junior synonyms of Phthanoperidinium? eocenicum. Eaton (1976, p.294) also proposed this combination. Age: Late Eocene.
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Locus typicus: Browns Creek Clays, SW. Victoria
Stratum typicum: Late Eocene
Original description: Cookson and Eisenack, 1965, p.119: Peridinium eocenicum
Shell small, oval, tabulated and divided almost equally by a relatively broad, helicoid girdle. Both epitheca and hypotheca with a small, solid horn. Wall of shell finely granular with or without small dot-like thickenings of variable size on the surface of the plates (Pl. 11, fig. 5). The borders of the girdle and the thin transparent ledges of the plates are lightly granular and their edges dotted with evenly spaced granules and small tubercles, or sparsely denticulate. Tabulation is of the Peridinium type, 4'?, 3[a], 7", 5''', 1p, 2''''. Plate 1' is kite-like in shape, the two upper sides of the "rhomb" being shorter than the two lower Plate 1''' is very narrow. Intercalary strips are sometimes evident. The archeopyle is relatively large, hexagonal, and intercalary.
Dimensions: Holotype c. 60 µm long, 40 µm broad. Range c. 48-62 µm long 33-48 µm broad.