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Diconodinium psilatum
From Fensome et al., 2019:
Diconidinium psilatum Morgan, 1977, p.128, pl.1, fig.5. Holotype: Morgan, 1977, pl.1, fig.5. Age: Albian–Maastrichtian.
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Original description: Morgan, 1977, p. 128
Ambitus rhomboidal to fusiform, prolonged into a truncate apical horn and a single sharp antapical horn set close to the midline. Epicyst and hypocyst of approximately equal size, or epicyst slightly larger. Apparent autophragm mostly thin, but may thicken to form a partly or wholly solid antapical horn. Surface psilate. Paracingulum may be delineated by two slightly raised ridges which may bear aligned granules or may not be discernible. Individual plates or parasulcus not discernible. Archeopyle rare, probably la or IPa.
Dimensions: 70-89 µm long and 36-54 µm broad. Average 77 µm long and 47 µm broad (10 specimens).
Affinities:
Morgan, 1977, p. 128: The lack of surface ornamentation, except at the paracingulum, is characteristic of D. psilatum. For discussion of other species, see treatment of D. arcticum.
Diconidinium psilatum Morgan, 1977, p.128, pl.1, fig.5. Holotype: Morgan, 1977, pl.1, fig.5. Age: Albian–Maastrichtian.
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Original description: Morgan, 1977, p. 128
Ambitus rhomboidal to fusiform, prolonged into a truncate apical horn and a single sharp antapical horn set close to the midline. Epicyst and hypocyst of approximately equal size, or epicyst slightly larger. Apparent autophragm mostly thin, but may thicken to form a partly or wholly solid antapical horn. Surface psilate. Paracingulum may be delineated by two slightly raised ridges which may bear aligned granules or may not be discernible. Individual plates or parasulcus not discernible. Archeopyle rare, probably la or IPa.
Dimensions: 70-89 µm long and 36-54 µm broad. Average 77 µm long and 47 µm broad (10 specimens).
Affinities:
Morgan, 1977, p. 128: The lack of surface ornamentation, except at the paracingulum, is characteristic of D. psilatum. For discussion of other species, see treatment of D. arcticum.