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Amphorosphaeridium multispinosum
Amphorosphaeridium? multispinosum, (Davey and Williams, 1966), Sarjeant, 1981
At the time of the transfer, Sarjeant (1981, p.123) questionably included this species in Amphorosphaeridium.
Holotype: Davey and Williams, 1966, pl.3, fig.6 and Bujak et al., 1980, pl.7, figs.1-2
Locus typicus: London Clay, Kent, England
Stratum typicum: Early Eocene
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Original description as Cordosphaeridium multispinosum: [Davey and Williams, 1966, p. 89-90]:
Diagnosis:
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.
Description:
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.
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.
Affinities:
In the linear arrangement of some of the processes and the haphazardous nature of others C. multispinosum differs from all other species of Cordosphaeridium.
At the time of the transfer, Sarjeant (1981, p.123) questionably included this species in Amphorosphaeridium.
Holotype: Davey and Williams, 1966, pl.3, fig.6 and Bujak et al., 1980, pl.7, figs.1-2
Locus typicus: London Clay, Kent, England
Stratum typicum: Early Eocene
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Original description as Cordosphaeridium multispinosum: [Davey and Williams, 1966, p. 89-90]:
Diagnosis:
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.
Description:
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.
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.
Affinities:
In the linear arrangement of some of the processes and the haphazardous nature of others C. multispinosum differs from all other species of Cordosphaeridium.