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Polystephanosphaera valensii
Polystephanosphaera valensii Sarjeant, 1960
NOW Systematophora. Originally Polystephanosphaera, subsequently (and now) Systematophora.
Taxonomic senior synonym: Hystrichosphaeridium (as and now Surculosphaeridium?) vestitum, according to Courtinat (1989, p.173) — however, Stancliffe and Sarjeant (1990, p.209) retained Polystephanosphaera (as and now Systematophora) valensii.
Holotype: Sarjeant, 1960a, pl.6, fig.6; text-fig.3c; Eisenack and Kjellström, 1972, p.143; Stancliffe and Sarjeant, 1990, pl.3, figs.5,7,10; Fensome et al., 1995, figs.2,4 — p.1871.
Locus typicus:Osmington Mills, Dorset, England
Stratum typicum: Late Oxfordian
Original diagnosis: Sarjeant, 1960, p. 142
A species of Polystephanosphaera having processes of very varied form, bifurcate or ramifying, slender or widened, sometimes linked to adjacent processes in the same group either at the base or by trabeculae at some point along its length (but never at the outer extremity). 12 to 16 rings of processes present.
Original description: Sarjeant, 1960, p. 142
Shell spheroidal, yellowish in colour, its surface granular. There is some suggestion of a circular outline on the shell surface at the position of origin of each group of processes.
Dimensions: Type: overall diameter 100 µm. Diameter of shell 62 µm, processes c. 20 µm long. Range observed: overall diameters 80 to 110 µm.
NOW Systematophora. Originally Polystephanosphaera, subsequently (and now) Systematophora.
Taxonomic senior synonym: Hystrichosphaeridium (as and now Surculosphaeridium?) vestitum, according to Courtinat (1989, p.173) — however, Stancliffe and Sarjeant (1990, p.209) retained Polystephanosphaera (as and now Systematophora) valensii.
Holotype: Sarjeant, 1960a, pl.6, fig.6; text-fig.3c; Eisenack and Kjellström, 1972, p.143; Stancliffe and Sarjeant, 1990, pl.3, figs.5,7,10; Fensome et al., 1995, figs.2,4 — p.1871.
Locus typicus:Osmington Mills, Dorset, England
Stratum typicum: Late Oxfordian
Original diagnosis: Sarjeant, 1960, p. 142
A species of Polystephanosphaera having processes of very varied form, bifurcate or ramifying, slender or widened, sometimes linked to adjacent processes in the same group either at the base or by trabeculae at some point along its length (but never at the outer extremity). 12 to 16 rings of processes present.
Original description: Sarjeant, 1960, p. 142
Shell spheroidal, yellowish in colour, its surface granular. There is some suggestion of a circular outline on the shell surface at the position of origin of each group of processes.
Dimensions: Type: overall diameter 100 µm. Diameter of shell 62 µm, processes c. 20 µm long. Range observed: overall diameters 80 to 110 µm.