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Paucisphaeridium
From Williams et al., 2017:
[Paucisphaeridium, Bujak, 1980, p. 30, 32
Type species: originally as Litosphaeridium? inversibuccinum, Davey and Williams, 1966b (pl.12, fig.3)] ; Paucisphaeridium inversibuccium, Bujak, 1980
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Original description: [Bujak, 1980]:
Description:
Chorate cysts with a spherical to subspherical central body. The processes are proximally expanded, hollow, and constricted near the distal end.
Process formula ?4`, 6", 0c, 6```, 0````, xs. When present, the sulcal processes are slender. Archaeopyle apical, presumably tetratabular. Operculum not observed.
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Modified description:
Stover and Williams, 1987, p. 173:
Synopsis:
Cysts skolochorate, body subspherical, but shape modified by confluence of proximally expanded intratabular processes, which are also constricted near their distal ends; paratabulation indicated by processes; cingular, antapical and possibly apical processes absent; archeopyle apical, type uncertain; operculum free.
Description:
Shape: Body subspherical, but shape modified by merging of body with expanded? process bases.
Wall relationships: Undifferentiated autophragm.
Wall features: No parasutural features. Hollow intratabular processes greatly expanded proximally, less so distally.
Archeopyle: Apical, type uncertain; operculum free, but unobserved.
Paratabulation: Indicated by intratabular processes; process formula: ?`, 6", Oc, 6```, O```` and Xs.
Paracingulum: Indicated by lack of processes between the precingular and postcingular series.
Parasulcus: Not indicated, or expressed by slender processes; number of processes not stated.
Size: Intermediate; overall size about 55 µm in diameter.
Affinities:
The shape of the processes on Paucisphaeridium serves to distinguish this genus from Litosphaeridium Davey and Williams in Davey et al. 1966 emended Lucas-Clark 1984, which has subcylindrical to dome-shaped to conical processes.
[Paucisphaeridium, Bujak, 1980, p. 30, 32
Type species: originally as Litosphaeridium? inversibuccinum, Davey and Williams, 1966b (pl.12, fig.3)] ; Paucisphaeridium inversibuccium, Bujak, 1980
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Bujak, 1980]:
Description:
Chorate cysts with a spherical to subspherical central body. The processes are proximally expanded, hollow, and constricted near the distal end.
Process formula ?4`, 6", 0c, 6```, 0````, xs. When present, the sulcal processes are slender. Archaeopyle apical, presumably tetratabular. Operculum not observed.
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Modified description:
Stover and Williams, 1987, p. 173:
Synopsis:
Cysts skolochorate, body subspherical, but shape modified by confluence of proximally expanded intratabular processes, which are also constricted near their distal ends; paratabulation indicated by processes; cingular, antapical and possibly apical processes absent; archeopyle apical, type uncertain; operculum free.
Description:
Shape: Body subspherical, but shape modified by merging of body with expanded? process bases.
Wall relationships: Undifferentiated autophragm.
Wall features: No parasutural features. Hollow intratabular processes greatly expanded proximally, less so distally.
Archeopyle: Apical, type uncertain; operculum free, but unobserved.
Paratabulation: Indicated by intratabular processes; process formula: ?`, 6", Oc, 6```, O```` and Xs.
Paracingulum: Indicated by lack of processes between the precingular and postcingular series.
Parasulcus: Not indicated, or expressed by slender processes; number of processes not stated.
Size: Intermediate; overall size about 55 µm in diameter.
Affinities:
The shape of the processes on Paucisphaeridium serves to distinguish this genus from Litosphaeridium Davey and Williams in Davey et al. 1966 emended Lucas-Clark 1984, which has subcylindrical to dome-shaped to conical processes.