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Oligosphaeridium pulcherrimum
Oligosphaeridium pulcherrimum (Deflandre and Cookson, 1955) Davey and Williams, 1966
Originally Hystrichosphaeridium, subsequently (and now) Oligosphaeridium.
Holotype: Deflandre and Cookson, 1955, pl.1, fig.8, text-figs.21-22
Locus typicus: Onepah Station, Australia
tratum typicum: Albian
Original diagnosis: Deflandre and Cookson, 1955, p.270: Hystrichosphaeridium pulcherrimum
Shell ellipsoidal, with about 14 appendages, the longest of which are generally shorter than the diameter of the shell. At about half their length the appendages gradually widen into deep, strongly perforated funnels, the walls of which are almost reticulate. The rims of the funnels are fringed with numerous spines which may be connected by small threads. Dimensions: Holotype: overall diameter c. 118 µm, shell 47 by c. 61 µm, appendages 26-38 µm.
Supplemental description: Davey and Williams, 1966, p.75
The processes of the London Clay specimens indicate a reflected tabulation of 4", 6"", 6""", 1p, 1"""" . The apical processes are relatively small and an apical archaeopyle is usually present. The fenestrate appearance of the processes in this species are extremely distinctive.
Originally Hystrichosphaeridium, subsequently (and now) Oligosphaeridium.
Holotype: Deflandre and Cookson, 1955, pl.1, fig.8, text-figs.21-22
Locus typicus: Onepah Station, Australia
tratum typicum: Albian
Original diagnosis: Deflandre and Cookson, 1955, p.270: Hystrichosphaeridium pulcherrimum
Shell ellipsoidal, with about 14 appendages, the longest of which are generally shorter than the diameter of the shell. At about half their length the appendages gradually widen into deep, strongly perforated funnels, the walls of which are almost reticulate. The rims of the funnels are fringed with numerous spines which may be connected by small threads. Dimensions: Holotype: overall diameter c. 118 µm, shell 47 by c. 61 µm, appendages 26-38 µm.
Supplemental description: Davey and Williams, 1966, p.75
The processes of the London Clay specimens indicate a reflected tabulation of 4", 6"", 6""", 1p, 1"""" . The apical processes are relatively small and an apical archaeopyle is usually present. The fenestrate appearance of the processes in this species are extremely distinctive.