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Agerasphaera
From Williams et al., 2017:
[Agerasphaera, Harland, 1979a, p.28–29
Taxonomic senior synonym: Eisenackia, according to Quattrocchio and Sarjeant (2003, p.144) — however, Fensome et al. (in press) retained Alisocysta, with Agerasphaera as its nomenclatural junior synonym.
Type species: originally as Eisenackia circumtabulata, Drugg, 1967 (pl.1, fig.12)]; Agerasphaera circumtabulata, Harland, 1979
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Original description: [Harland, 1979]:
Diagnosis:
Small, spherical to ovoidal cysts bearing distinct penitabular membranes whose arrangement indicates a paratabulation of ?pr, 4`, 6", 6c, 4s, 6```, 1p, 1````. Wall layers closely adpressed with no thickening of the periphragm in the plate areas. Ornamentation smooth to microreticulate, microgranulate or micropunctate- penitabular membranes smooth to microgranulate, or micropunctate. Archeopyle apical, formed by loss of the four apical plates as a single opercular piece.
[Agerasphaera, Harland, 1979a, p.28–29
Taxonomic senior synonym: Eisenackia, according to Quattrocchio and Sarjeant (2003, p.144) — however, Fensome et al. (in press) retained Alisocysta, with Agerasphaera as its nomenclatural junior synonym.
Type species: originally as Eisenackia circumtabulata, Drugg, 1967 (pl.1, fig.12)]; Agerasphaera circumtabulata, Harland, 1979
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Original description: [Harland, 1979]:
Diagnosis:
Small, spherical to ovoidal cysts bearing distinct penitabular membranes whose arrangement indicates a paratabulation of ?pr, 4`, 6", 6c, 4s, 6```, 1p, 1````. Wall layers closely adpressed with no thickening of the periphragm in the plate areas. Ornamentation smooth to microreticulate, microgranulate or micropunctate- penitabular membranes smooth to microgranulate, or micropunctate. Archeopyle apical, formed by loss of the four apical plates as a single opercular piece.