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Aldorfia
From Williams et al., 2017:
[Aldorfia, Stover and Evitt, 1978, p. 140
Riding and Fensome (2003, p.19) considered that Aldorfia may be a tax. jr. syn. of Apteodinium.
Type species: originally as Gonyaulacysta aldorfensis, Gocht, 1970b (pl.31, figs.10a–c)] ; Aldorfia aldorfensis, Stover and Evitt, 1978
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Original description: [Stover and Evitt, 1978]:
Synopsis: Cysts subspherical with an apical projection; autophragm and ectophragm separated; ectocoel with continuous muri or isolated processes, or combination thereof; paratabulation partly indicated by faint parasutural features or by archeopyle only; latter precingular, type P.
Description:
Shape: Cysts subspherical, usually with a short apical projection.
Wall relationships: Autophragm and ectophragm clearly separated. Resultant ectocoel filled with isolated to nearly contiguous structures.
Wall features: Parasutural features absent or appear as weakly developed linear markings (low ridges?) on ectophragm. Ectocoel with wide to slender isolated projections and/or discontinuous muri, which form an internal reticulum whose lumina vary greatly in shape and size. Projections somewhat longer at apical pole than elsewhere.
Paratabulation: Indicated generally by archaeopyle only, occasionally by faint linear parasutural features (low ridges?) as well.
Archaeopyle: Precingular, type P (3`` only); operculum free.
Paracingulum: Indicates by an equatorial depression.
Parasulcus: Indicated by a midventral depression on hypocyst.
Size: Intermediate to large.
Affinities:
Aldorfia differs from Apteodinium in having separated autophragm and ectophragm, the ectocoel thus formed being filled with various structures. Apteodinium normally has an autophragm only, and in examples where two wall layers are distinguishable, they are appressed.
[Aldorfia, Stover and Evitt, 1978, p. 140
Riding and Fensome (2003, p.19) considered that Aldorfia may be a tax. jr. syn. of Apteodinium.
Type species: originally as Gonyaulacysta aldorfensis, Gocht, 1970b (pl.31, figs.10a–c)] ; Aldorfia aldorfensis, Stover and Evitt, 1978
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Stover and Evitt, 1978]:
Synopsis: Cysts subspherical with an apical projection; autophragm and ectophragm separated; ectocoel with continuous muri or isolated processes, or combination thereof; paratabulation partly indicated by faint parasutural features or by archeopyle only; latter precingular, type P.
Description:
Shape: Cysts subspherical, usually with a short apical projection.
Wall relationships: Autophragm and ectophragm clearly separated. Resultant ectocoel filled with isolated to nearly contiguous structures.
Wall features: Parasutural features absent or appear as weakly developed linear markings (low ridges?) on ectophragm. Ectocoel with wide to slender isolated projections and/or discontinuous muri, which form an internal reticulum whose lumina vary greatly in shape and size. Projections somewhat longer at apical pole than elsewhere.
Paratabulation: Indicated generally by archaeopyle only, occasionally by faint linear parasutural features (low ridges?) as well.
Archaeopyle: Precingular, type P (3`` only); operculum free.
Paracingulum: Indicates by an equatorial depression.
Parasulcus: Indicated by a midventral depression on hypocyst.
Size: Intermediate to large.
Affinities:
Aldorfia differs from Apteodinium in having separated autophragm and ectophragm, the ectocoel thus formed being filled with various structures. Apteodinium normally has an autophragm only, and in examples where two wall layers are distinguishable, they are appressed.