Back
Exochosphaeridium punctatum
From Fensome et al., 2019:
Exochosphaeridium punctatum (Jain and Millepied, 1975, p.151, pl.5, figs.71–72) Masure in Fauconnier and Masure, 2004, p.164.
Holotype: Jain and Millepied, 1975, pl.5, fig.72. Originally Polysphaeridium, subsequently Polysphaeridium?, thirdly Dapsilidinium?, fourthly (and now) Exochosphaeridium?. Questionable assignment: Masure in Fauconnier and Masure (2004, p.164). Age: Maastrichtian.
---------------------------------------------------------------------------------------------------
Original description: [Jain and Millepied, 1975]:
Polysphaeridium punctatum sp. nov. (PI. 5, Figs. 71-72)
Holotype - Pl. 5, Fig. 72; Slide No. 7762-7.
Type locality - Bore hole no. CM-1, depth 861 metres; Senegal Basin, W. Africa.
Horizon - Maestrichtian.
Diagnosis - Cyst spherical in outline, wall thick, periphragm micropunctate, proccsses of two types, one shorter, distally truncate and other longer with bifid or spinose apex; both hollow distally. Archaeopyle apical with anglar margin.
Measurements
Cyst diameter: holotype: 65 μm, range: 60-80 μm
Process size: holotype: 10 x 6.5 μm, range: 10-13 x 5-7 μm
Wall thickness: holotype: 1.5 μm, range: 1.5 x 2 μm
Comparison - P. punctatum sp. nov. comes nearest to P. elongatum sp. nov. in having similar mixed type of processes and punctate test surface. But differs in having spherical shape than elongate with dropping processes.
Exochosphaeridium punctatum (Jain and Millepied, 1975, p.151, pl.5, figs.71–72) Masure in Fauconnier and Masure, 2004, p.164.
Holotype: Jain and Millepied, 1975, pl.5, fig.72. Originally Polysphaeridium, subsequently Polysphaeridium?, thirdly Dapsilidinium?, fourthly (and now) Exochosphaeridium?. Questionable assignment: Masure in Fauconnier and Masure (2004, p.164). Age: Maastrichtian.
---------------------------------------------------------------------------------------------------
Original description: [Jain and Millepied, 1975]:
Polysphaeridium punctatum sp. nov. (PI. 5, Figs. 71-72)
Holotype - Pl. 5, Fig. 72; Slide No. 7762-7.
Type locality - Bore hole no. CM-1, depth 861 metres; Senegal Basin, W. Africa.
Horizon - Maestrichtian.
Diagnosis - Cyst spherical in outline, wall thick, periphragm micropunctate, proccsses of two types, one shorter, distally truncate and other longer with bifid or spinose apex; both hollow distally. Archaeopyle apical with anglar margin.
Measurements
Cyst diameter: holotype: 65 μm, range: 60-80 μm
Process size: holotype: 10 x 6.5 μm, range: 10-13 x 5-7 μm
Wall thickness: holotype: 1.5 μm, range: 1.5 x 2 μm
Comparison - P. punctatum sp. nov. comes nearest to P. elongatum sp. nov. in having similar mixed type of processes and punctate test surface. But differs in having spherical shape than elongate with dropping processes.