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Glabridinium
From Williams et al., 2017:
[Glabridinium, Brideaux, 1977, p. 35
Type species: originally as Scriniodinium apatelum, Cookson and Eisenack, 1960b (pl.37, fig.12)] ; Glabridinium apelatum, Brideaux, 1977
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Original description: [Brideaux, 1977]:
Description:
Shape: Pericyst ambitus elongate; the epipericyst produced to form an apical horn; the hypopericyst tapering slightly from the presumed latitude of the paracingulum, with a tubular to inverted frustum shape, quadrate in cross-section and open and the antapex to form an antapical breach. Endocyst distinctly elongate; endocyst produced to form a short apical horn or prominence. Apical and antapical pericoels developed by separation of the apical pericyst and the antapical pericyst. Ambital pericoel not developed; compression dorso-ventral.
Phragma: Periphragm of constant thickness, the exception being the possible presence of four thin longitudinal rib-like thickenings on the frustum shaped part of the hypoperiphragm; surface smooth to scabrate. No evidence of paratabulation.
Paratabulation: Evidence for paratabulation lacking except in vicinity of the periarchaeopyle.
Archaeopyle/operculum: Periarchaeropyle formed by the loss of the third precingular paraplate; perioperculum simple, detached. Endoarchaeopyle formed by the loss of the third precingular paraplate, endoperculum simple, detached.
Formula: P/P
Pericingulum/perisulcus: Pericingulum generally indistinct or absent. Perisulcus present or absent.
Other features: Antapex of the hypopericyst bears a quadrate opening; the edges smooth or serrate, sometimes with short, spiny projections at each angle (prolongations of the longitudinal rib-like thickenings on the hypopericyst)
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Stover and Williams, 1987, p. 109:
Remark:
Sarjeant (1982, p.41) regarded Glabridinium as a junior synonym of Tubotuberella.
[Glabridinium, Brideaux, 1977, p. 35
Type species: originally as Scriniodinium apatelum, Cookson and Eisenack, 1960b (pl.37, fig.12)] ; Glabridinium apelatum, Brideaux, 1977
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Brideaux, 1977]:
Description:
Shape: Pericyst ambitus elongate; the epipericyst produced to form an apical horn; the hypopericyst tapering slightly from the presumed latitude of the paracingulum, with a tubular to inverted frustum shape, quadrate in cross-section and open and the antapex to form an antapical breach. Endocyst distinctly elongate; endocyst produced to form a short apical horn or prominence. Apical and antapical pericoels developed by separation of the apical pericyst and the antapical pericyst. Ambital pericoel not developed; compression dorso-ventral.
Phragma: Periphragm of constant thickness, the exception being the possible presence of four thin longitudinal rib-like thickenings on the frustum shaped part of the hypoperiphragm; surface smooth to scabrate. No evidence of paratabulation.
Paratabulation: Evidence for paratabulation lacking except in vicinity of the periarchaeopyle.
Archaeopyle/operculum: Periarchaeropyle formed by the loss of the third precingular paraplate; perioperculum simple, detached. Endoarchaeopyle formed by the loss of the third precingular paraplate, endoperculum simple, detached.
Formula: P/P
Pericingulum/perisulcus: Pericingulum generally indistinct or absent. Perisulcus present or absent.
Other features: Antapex of the hypopericyst bears a quadrate opening; the edges smooth or serrate, sometimes with short, spiny projections at each angle (prolongations of the longitudinal rib-like thickenings on the hypopericyst)
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Stover and Williams, 1987, p. 109:
Remark:
Sarjeant (1982, p.41) regarded Glabridinium as a junior synonym of Tubotuberella.