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Cassiculosphaeridia
From Williams et al., 2017:
[Cassiculosphaeridia, Davey, 1969a, p.141
Tax. sen. syn.: Valensiella, according to Courtinat (1989, p.182) - however, Slimani (1994, p.98) retained Cassiculosphaeridia.
Type species: Cassiculosphaeridia reticulata, Davey, 1969a (pl.4, fig.3)]
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Original description: [Davey, 1969]:
Diagnosis:
Proximate cysts; shell spherical to subspherical, composed of two layers, without apical or antapical protuberances. Periphragm giving rise to low crests or membranes which form a reticulate pattern. Tabulation absent. Archeopyle apical with angular margin.
Affinities:
The surface reticulation of Cassiculosphaeridia is very similar to that of Ellipsoidictyum cinctum Klement (196). Both possess an apical archaeopyle, but whereas in Cassiculosphaeridia all signs of a tabulation are absent, in Ellipsoidictyum there is an obvious cingulum. Dictyopyxidia Eisenack (1961) is also very similar but possesses a cingulum and sulcus.
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Modified description:
Stover and Evitt 1978, p. 25-26:
Synopsis:
Cysts proximate, subspherical; autophragm with low ridges that form a reticulum, latter not covered by an ectophragm; archeopyle apical, Type tA.
Description:
Shape: Subspherical.
Wall relationships: Autophragm only.
Wall features: No parasutural features. Autophragm with low ridges that form an imperfect to complete reticulum with mostly polygonal lumina; latter irregular in size and shape. Autophragm smooth to faintly ornamented and not covered by an ectophragm.
Paratabulation: Indicated generally by archeopyle only; formula unknown. Archeopyle: Apical, Type tA; principal archeopyle suture zigzag; operculum free.
Paracingulum: Generally not indicated, or indicated feebly by faint alignment of muri.
Parasulcus: Not indicated.
Size: Small to intermediate.
Affinities:
Cassiculosphaeridia differs from Ellipsoidictyum in lacking indications of a paracingulum and in having an archeopyle with a more nearly circular outline. It differs from Histiocysta in not having parasutural features.
[Cassiculosphaeridia, Davey, 1969a, p.141
Tax. sen. syn.: Valensiella, according to Courtinat (1989, p.182) - however, Slimani (1994, p.98) retained Cassiculosphaeridia.
Type species: Cassiculosphaeridia reticulata, Davey, 1969a (pl.4, fig.3)]
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Original description: [Davey, 1969]:
Diagnosis:
Proximate cysts; shell spherical to subspherical, composed of two layers, without apical or antapical protuberances. Periphragm giving rise to low crests or membranes which form a reticulate pattern. Tabulation absent. Archeopyle apical with angular margin.
Affinities:
The surface reticulation of Cassiculosphaeridia is very similar to that of Ellipsoidictyum cinctum Klement (196). Both possess an apical archaeopyle, but whereas in Cassiculosphaeridia all signs of a tabulation are absent, in Ellipsoidictyum there is an obvious cingulum. Dictyopyxidia Eisenack (1961) is also very similar but possesses a cingulum and sulcus.
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Modified description:
Stover and Evitt 1978, p. 25-26:
Synopsis:
Cysts proximate, subspherical; autophragm with low ridges that form a reticulum, latter not covered by an ectophragm; archeopyle apical, Type tA.
Description:
Shape: Subspherical.
Wall relationships: Autophragm only.
Wall features: No parasutural features. Autophragm with low ridges that form an imperfect to complete reticulum with mostly polygonal lumina; latter irregular in size and shape. Autophragm smooth to faintly ornamented and not covered by an ectophragm.
Paratabulation: Indicated generally by archeopyle only; formula unknown. Archeopyle: Apical, Type tA; principal archeopyle suture zigzag; operculum free.
Paracingulum: Generally not indicated, or indicated feebly by faint alignment of muri.
Parasulcus: Not indicated.
Size: Small to intermediate.
Affinities:
Cassiculosphaeridia differs from Ellipsoidictyum in lacking indications of a paracingulum and in having an archeopyle with a more nearly circular outline. It differs from Histiocysta in not having parasutural features.