Cleistosphaeridium granulatum, Burger, 1980

Holotype: Burger, 1980a, pl.33, fig.2; Fauconnier and Masure, 2004, pl.49, figs.3-4.
Type locality: Wallumbilla Formation, Coreena Member; Cretaceous, early Albian
Distribution: A rare to uncommon species in the marine sequence of the Surat Basin.
Age: Albian

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Original description: [Burger, 1980]:

Description:
Cyst spherical, dehisced cyst cup-shaped.
Archaeopyle, if formed, medium to large, apical, outline circular; margin almost smooth or undulate.
Cyst wall single-layered, granulate, and covered with about 100 thin, solid, slightly tapering and frequently curved spines 2-8 µm high, with acuminate tips.
No parasuture pattern is apparent from the distribution of the processes.

Dimensions:
Width (16 specimens) 27-62 µm.

Comments:
This species is distinguished by its granulate cyst wall and the relatively small number of short, curved spines. C. aciculare Davey, 1969, has longer and thicker processes and a thicker wall.