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Escharisphaeridia
From Fensome et al., 2019:
"Escharisphaeridia", Erkmen and Sarjeant, 1980, p.62–63.
Taxonomic senior synonym: Sentusidinium, according to Wood et al. (2016, p.79).
Type: Sarjeant, 1968, pl.3, fig.9, as Chytroeisphaeridia pocockii.
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Original description: [Erkmen and Sarjeant, 1980]:
Proximate cysts, sphaeroidal to ovoidal in shape, without crests, septa, spines or processes. Phragma composed of a single layer (an autophragm) or of two layers in close and continuous contact. Surface of phragma smooth to scabrate, punctate, or very minutely reticulate, but without verrucae or other coarser ornamentational features. A paracingulum may be indicated by indentation of the cyst or by lack of ornament. Archaeopyle apical, accessory archaeopyle sutures being developed to varying degrees.
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Modified description:
Stover and Williams, 1987, p. 89:
Synopsis:
Cysts subspherical and without ridges, septa, spines or processes; autophragm smooth or scabrate to microreticulate, or punctate; archeopyle apical, type [tA], operculum free; other indications of paratabulation faint or absent.
Description:
Shape: Subspherical.
Wall relationships: Autophragm only.
Wall features: No projecting features indicating paratabulation, autophragm smooth, or scabrate to microreticulate, or punctate.
Archeopyle: Apical, type [tA], operculum free.
Paratabulation: Normally indicted by archeopyle only.
Paracingulum: Generally not indicated.
Parasulcus: Not indicated.
Size: Small to intermediate; about 25 to 80 µm.
Affinities:
Escharisphaeridia differs from Batiacasphaera Drugg 1970 in having a smooth or scabrate to microreticulate, or punctate autophragm rather than an autophragm with low, isolated or fused projections, or other types of ornamentation of moderate relief exclusive of spines or processes.
"Escharisphaeridia", Erkmen and Sarjeant, 1980, p.62–63.
Taxonomic senior synonym: Sentusidinium, according to Wood et al. (2016, p.79).
Type: Sarjeant, 1968, pl.3, fig.9, as Chytroeisphaeridia pocockii.
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Original description: [Erkmen and Sarjeant, 1980]:
Proximate cysts, sphaeroidal to ovoidal in shape, without crests, septa, spines or processes. Phragma composed of a single layer (an autophragm) or of two layers in close and continuous contact. Surface of phragma smooth to scabrate, punctate, or very minutely reticulate, but without verrucae or other coarser ornamentational features. A paracingulum may be indicated by indentation of the cyst or by lack of ornament. Archaeopyle apical, accessory archaeopyle sutures being developed to varying degrees.
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Modified description:
Stover and Williams, 1987, p. 89:
Synopsis:
Cysts subspherical and without ridges, septa, spines or processes; autophragm smooth or scabrate to microreticulate, or punctate; archeopyle apical, type [tA], operculum free; other indications of paratabulation faint or absent.
Description:
Shape: Subspherical.
Wall relationships: Autophragm only.
Wall features: No projecting features indicating paratabulation, autophragm smooth, or scabrate to microreticulate, or punctate.
Archeopyle: Apical, type [tA], operculum free.
Paratabulation: Normally indicted by archeopyle only.
Paracingulum: Generally not indicated.
Parasulcus: Not indicated.
Size: Small to intermediate; about 25 to 80 µm.
Affinities:
Escharisphaeridia differs from Batiacasphaera Drugg 1970 in having a smooth or scabrate to microreticulate, or punctate autophragm rather than an autophragm with low, isolated or fused projections, or other types of ornamentation of moderate relief exclusive of spines or processes.