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Impletosphaeridium granulatum
Impletosphaeridium granulatum (Burger, 1980a, p.77, pl.33, figs.2-4,6-10) Islam, 1993, p.86.
Holotype: Burger, 1980a, pl.33, fig.2; Fauconnier and Masure, 2004, pl.49, figs.3-4.
Originally Cleistosphaeridium, subsequently (and now) Impletosphaeridium.
Age: Albian.
Original description (Burger, 19080a)
Holotype: BMR Roma 9, depth 30.5 m (100 ft 2 in); Wallumbilla Formation, Coreena Member. Cretaceous, early Albian (MFP 4615-1,419/1184; CPC 16385. PI. 33, fig. 2).
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.
Distribution: A rare to uncommon species in the marine sequence of the Surat Basin.
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.
Holotype: Burger, 1980a, pl.33, fig.2; Fauconnier and Masure, 2004, pl.49, figs.3-4.
Originally Cleistosphaeridium, subsequently (and now) Impletosphaeridium.
Age: Albian.
Original description (Burger, 19080a)
Holotype: BMR Roma 9, depth 30.5 m (100 ft 2 in); Wallumbilla Formation, Coreena Member. Cretaceous, early Albian (MFP 4615-1,419/1184; CPC 16385. PI. 33, fig. 2).
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.
Distribution: A rare to uncommon species in the marine sequence of the Surat Basin.
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.