Downiesphaeridium flexuosum (Davey et al., 1966; emend. Sarkar and Singh, 1988) Islam, 1993

Originally Cleistosphaeridium?, subsequently Polysphaeridium?, thirdly Cleistosphaeridium, fourthly (and now) Downiesphaeridium.

Holotype: Davey et al., 1966, pl.2, fig.5
Locus typicus: Fetcham Mill, Surrey, England
Stratum typicum: Cenomanian

Original diagnosis: Davey et al., 1966, p.169: Cleistosphaeridium flexuosum
Central body subsphaerical to elongate, bearing numerous, broadly acuminate, processes. All processes of approximately same length, slightly fibrous and always flexuous.

Original description: Davey et al., 1966, p.169: Cleistosphaeridium flexuosum
The most distinctive feature of ?C. flexuosum is the flexuous nature of the broad fibrous processes. The nature of the surface of the central body is difficult to determine and the presence of an archaeopyle has not been recorded.

Emended diagnosis: Sarkar and Singh, 1988, p.39
Central body subspherical to elongate. Body wall made up of autophragm only which is granulose in ornamentation. Numerous nontabular processes are present all over the body surface. The processes are hollow, unbranched and distally closed with a acuminate end. All processes are of almost same sizes and shape fibrous and flexuosus in nature. The archaeopyle is apical in position. Paratabulation is not very clear due to the clustering of processes.
Dimensions: Observed range: Size of the central body 35x30 Ám to 65x40 Ám; length of the processes 8 to 20 Ám.

Affinities:
Davey et al., 1966, p.169: Cleistosphaeridium flexuosum
The nature of the processes easily differentiate ?C. flexuosum from all other previously described species.