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Silicisphaera tenera
Silicisphaera tenera Davey and Verdier, 1976
Now Florentinia. Originally Silicisphaera, subsequently (and now) Florentinia.
Holotype: Davey and Verdier, 1976, pl.3, figs.8-11
Locus typicus: Loffre Borehole, Nord, France
Stratum typicum: Senonian
Original diagnosis: Davey and Verdier, 1976, p.326
The cyst is subspherical to ovoidal and is composed of a relatively thin, smooth wall bearing both simple and inflated complex processes. The processes are thin-walled, faintly striate; the finer, simple processes appear to be acuminate whereas the remainder are truncated distally. The simple processes occupy the apical, cingular and sulcal regions and number two to four per reflected area. An apical process, or processes, may be situated on an apical boss. The antapical process may be simple, bifurcate or trifurcate but is never distinctively large. The pre- and postcingular processes tend to be complex and are extremely large with several to numerous narrow terminal tubules or spines. The base of each process covers most of each plate area. Typically five of these processes are precingular and four are postcingular. The endophragm layer is slightly thicker and raised into ridges where the processes join the main body of the cyst. The archaeopyle is consistently formed by the loss of precingular plate 3".
Now Florentinia. Originally Silicisphaera, subsequently (and now) Florentinia.
Holotype: Davey and Verdier, 1976, pl.3, figs.8-11
Locus typicus: Loffre Borehole, Nord, France
Stratum typicum: Senonian
Original diagnosis: Davey and Verdier, 1976, p.326
The cyst is subspherical to ovoidal and is composed of a relatively thin, smooth wall bearing both simple and inflated complex processes. The processes are thin-walled, faintly striate; the finer, simple processes appear to be acuminate whereas the remainder are truncated distally. The simple processes occupy the apical, cingular and sulcal regions and number two to four per reflected area. An apical process, or processes, may be situated on an apical boss. The antapical process may be simple, bifurcate or trifurcate but is never distinctively large. The pre- and postcingular processes tend to be complex and are extremely large with several to numerous narrow terminal tubules or spines. The base of each process covers most of each plate area. Typically five of these processes are precingular and four are postcingular. The endophragm layer is slightly thicker and raised into ridges where the processes join the main body of the cyst. The archaeopyle is consistently formed by the loss of precingular plate 3".