Back
Cleistosphaeridium perforoconum
Cleistosphaeridium perforoconum, Yun, 1981
Holotype: Yun, 1981, pl.15, fig.4; Fensome et al., 1991, fig.4-p.707
Locus typicus: Timmermann brickyard near Esbeck, Germany
Stratum typicum: Early Santonian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original diagnosis: [Yun, 1981, p. 43]: (Translation: Fensome, 1991, p. 707-708)
Diagnosis:
The proximochorate, spherical cyst consists of a smooth endophragm and a thin, densely perforate periphragm (pore diameter = 0.6 - 0.8 µm), which gives rise to numerous, small, relatively uniformly shaped processes. Their tips are usually rounded, rarely truncate or bulbous. They are closed distally and not forked. Apart from these processes, there are very occasionally processes of quadrangular outline with concave sides. Apparently there is a small relict-like cavity at the base of the spine. An apical archeopyle is commonly present.
Holotype: Yun, 1981, pl.15, fig.4; Fensome et al., 1991, fig.4-p.707
Locus typicus: Timmermann brickyard near Esbeck, Germany
Stratum typicum: Early Santonian
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original diagnosis: [Yun, 1981, p. 43]: (Translation: Fensome, 1991, p. 707-708)
Diagnosis:
The proximochorate, spherical cyst consists of a smooth endophragm and a thin, densely perforate periphragm (pore diameter = 0.6 - 0.8 µm), which gives rise to numerous, small, relatively uniformly shaped processes. Their tips are usually rounded, rarely truncate or bulbous. They are closed distally and not forked. Apart from these processes, there are very occasionally processes of quadrangular outline with concave sides. Apparently there is a small relict-like cavity at the base of the spine. An apical archeopyle is commonly present.