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Cordosphaeridium multispinosum
Cordosphaeridium multispinosum Davey and Williams, 1966
Now Amphorosphaeridium?. Originally Cordosphaeridium, subsequently (and now) Amphorosphaeridium?.
Holotype: Davey and Williams, 1966, pl.3, fig.6; Bujak et al., 1980, pl.7, figs.1-2
Locus typicus: London Clay, Kent, England
Stratum typicum: Eocene
Original diagnosis: Davey and Williams, 1966, p. 89-90
Sub-spherical to ovoidal central body. Thin endophragm and fibrous periphragm giving rise to numerous, more than 45, short fibrous processes. Processes taeniate, solid, undulose with serrate or digitate distal margins, sometimes arranged in meridional rows, sometimes haphazard in position.
Dimensions: holotype: diameter of central body 56 by 59 µm, length of processes up to 15 µm. Range: diameter of central body 45-59 µm, length of processes up to 24 µm.
Original description: Davey and Williams, 1966, p. 90
The processes are numerous, generally simple with parallel edges expanding proximally and distally. Some of the processes are regularly linked proximally in such a manner as to give rise to six long rows, running from apex to antapex. Between these rows the arrangement of the other processes appears to be haphazard. There appear to be 2, rarely 3, processes per plate area. The maximum width of the processes is 7 µm, and their length one-quarter to one-third (rarely up to one-half) the diameter of the central body. Occasionally fine, acuminate processes are present on the central body. There is a well developed archaeopyle with an uninterrupted margin.
Affinities:
Davey and Williams 1966, p. 90: In the linear arrangement of some of the processes and the haphazardous nature of others C. multispinosum differs from all other species of Cordosphaeridium.
Now Amphorosphaeridium?. Originally Cordosphaeridium, subsequently (and now) Amphorosphaeridium?.
Holotype: Davey and Williams, 1966, pl.3, fig.6; Bujak et al., 1980, pl.7, figs.1-2
Locus typicus: London Clay, Kent, England
Stratum typicum: Eocene
Original diagnosis: Davey and Williams, 1966, p. 89-90
Sub-spherical to ovoidal central body. Thin endophragm and fibrous periphragm giving rise to numerous, more than 45, short fibrous processes. Processes taeniate, solid, undulose with serrate or digitate distal margins, sometimes arranged in meridional rows, sometimes haphazard in position.
Dimensions: holotype: diameter of central body 56 by 59 µm, length of processes up to 15 µm. Range: diameter of central body 45-59 µm, length of processes up to 24 µm.
Original description: Davey and Williams, 1966, p. 90
The processes are numerous, generally simple with parallel edges expanding proximally and distally. Some of the processes are regularly linked proximally in such a manner as to give rise to six long rows, running from apex to antapex. Between these rows the arrangement of the other processes appears to be haphazard. There appear to be 2, rarely 3, processes per plate area. The maximum width of the processes is 7 µm, and their length one-quarter to one-third (rarely up to one-half) the diameter of the central body. Occasionally fine, acuminate processes are present on the central body. There is a well developed archaeopyle with an uninterrupted margin.
Affinities:
Davey and Williams 1966, p. 90: In the linear arrangement of some of the processes and the haphazardous nature of others C. multispinosum differs from all other species of Cordosphaeridium.