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Impletosphaeridium apodastum
From Fensome et al., 2019:
Impletosphaeridium apodastum Fensome et al., 2016b, p.52, pl.9, figs.5–8. Holotype: Fensome et al., 2016b, pl.9, fig.5. Age: last occurrence, Selandian.
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Original description Fensome et al., 2016b:
Holotype. Plate 9, fig. 5, from a cuttings sample at 4565–4575 m in Hekja O-71, GSC type collection no. 137903, sample P18737, slide 01, co-ordinates 13.3 × 108.0, England Finder N37/3. Central body length 30 μm, width 26 μm; length of processes up to 17 μm, width less than 1 μm. The age determined for the sample from which the holotype was recovered is late Danian.
Etymology. The epithet is from the Greek apodastos, meaning separated or apportioned, in reference to the bifurcations of the processes distally.
Diagnosis. A species of Impletosphaeridium with solid delicate processes that divide distally into two relatively long branches. The branches are bifurcate at the tips and usually curve back towards the central body.
Description. This species has a rounded, small central body that is granulate. Distally, the solid delicate pro -cesses divide into two, relatively long branches, each of which is bifurcate at its tip. These distal branches usually curve back towards the central body. The initial bifurcations are generally one-quarter to one-third as long as the main stem of the process but can be as much as a half or as little as a quarter the length. There are about 50 processes per specimen. Size. Central body length 20–33 μm, width 18–27 μm, length of processes 10–18 μm; six specimens measured.
Age. LO: Selandian.
Remarks. Impletosphaeridium apodastum is characterised by the high number of processes and their distinctive distal extremities, which branch. Tips of the two branches are usually bifid. Occasional processes have three branches. Because of the unknown nature of the archaeopyle, this species is included in Impletosphaeridium.
Impletosphaeridium apodastum Fensome et al., 2016b, p.52, pl.9, figs.5–8. Holotype: Fensome et al., 2016b, pl.9, fig.5. Age: last occurrence, Selandian.
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Original description Fensome et al., 2016b:
Holotype. Plate 9, fig. 5, from a cuttings sample at 4565–4575 m in Hekja O-71, GSC type collection no. 137903, sample P18737, slide 01, co-ordinates 13.3 × 108.0, England Finder N37/3. Central body length 30 μm, width 26 μm; length of processes up to 17 μm, width less than 1 μm. The age determined for the sample from which the holotype was recovered is late Danian.
Etymology. The epithet is from the Greek apodastos, meaning separated or apportioned, in reference to the bifurcations of the processes distally.
Diagnosis. A species of Impletosphaeridium with solid delicate processes that divide distally into two relatively long branches. The branches are bifurcate at the tips and usually curve back towards the central body.
Description. This species has a rounded, small central body that is granulate. Distally, the solid delicate pro -cesses divide into two, relatively long branches, each of which is bifurcate at its tip. These distal branches usually curve back towards the central body. The initial bifurcations are generally one-quarter to one-third as long as the main stem of the process but can be as much as a half or as little as a quarter the length. There are about 50 processes per specimen. Size. Central body length 20–33 μm, width 18–27 μm, length of processes 10–18 μm; six specimens measured.
Age. LO: Selandian.
Remarks. Impletosphaeridium apodastum is characterised by the high number of processes and their distinctive distal extremities, which branch. Tips of the two branches are usually bifid. Occasional processes have three branches. Because of the unknown nature of the archaeopyle, this species is included in Impletosphaeridium.