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Oligosphaeridium nannus
Oligosphaeridium nannum Davey, 1974
Now Discorsia. Originally Oligosphaeridium, subsequently (and now) Discorsia.
Holotype: Davey, 1974, pl.4, fig.9; Khowaja-Ateequzzaman et al., 1985, pl.1, fig.1-4
Locus typicus: Speeton, England
Stratum typicum: Barremian
Original description: Davey, 1974, p. 59
Diagnosis: The central body is small (usually under 25 µm diameter), subspherical and bears a low number of processes (usually 13 or 14). The processes are all of similar size; they expand both proximally and distally, and terminate distally with a gently denticulate margin. Each has strong longitudinal ribs which radiate from the process base onto the cyst surface and may join with similar ribs radiating from neighbouring processes. Two or three of the processes may be linked medially by a fine membrane. An archaeopyle has not been observed with certainty and for this reason it is probably small. Dimensions: holotype: central body diameter, 24 x 24 µm, process length, 10-14 µm. Range: central body diameter, 17(22)24 µm, process length, 12-14 µm (maximum).
Now Discorsia. Originally Oligosphaeridium, subsequently (and now) Discorsia.
Holotype: Davey, 1974, pl.4, fig.9; Khowaja-Ateequzzaman et al., 1985, pl.1, fig.1-4
Locus typicus: Speeton, England
Stratum typicum: Barremian
Original description: Davey, 1974, p. 59
Diagnosis: The central body is small (usually under 25 µm diameter), subspherical and bears a low number of processes (usually 13 or 14). The processes are all of similar size; they expand both proximally and distally, and terminate distally with a gently denticulate margin. Each has strong longitudinal ribs which radiate from the process base onto the cyst surface and may join with similar ribs radiating from neighbouring processes. Two or three of the processes may be linked medially by a fine membrane. An archaeopyle has not been observed with certainty and for this reason it is probably small. Dimensions: holotype: central body diameter, 24 x 24 µm, process length, 10-14 µm. Range: central body diameter, 17(22)24 µm, process length, 12-14 µm (maximum).