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Abratopdinium
From Fensome et al., 2019:
Abratopdinium, Mao Shaozhi and Mohr, 1992, p. 317-318
Type: Mao Shaozhi and Mohr, 1992, pl.1, fig.1, as Abratopdinium kerguelense.
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Original description: Mao Shaozhi and Mohr, 1992
Description:
Circumcavate cysts, ambital outline circular, subcircular, to heartlike. Both periphragm and endophragm thin and hyaline; periphragm smooth or with features of low relief; endophragm smooth.
Paracingulum generally indicated by ridges only seen marginally, seldom by sparse verrucae seen on the surface. Parasulcus, where present, limited to the hypocyst.
Archeopyle intercalary [2a], standard hexastyle, iso-thetaform or rounded at each corner, AI = 0.53-0.63; operculum free.
Affinities:
Abratopdinium differs from any published genus in its thin and hyaline wall, small to medium size, archeopyle type, and rounded shape with no distinct horns. Nelsoniella, which may have a similar outline, has a thicker wall and is epicavate only.
Abratopdinium, Mao Shaozhi and Mohr, 1992, p. 317-318
Type: Mao Shaozhi and Mohr, 1992, pl.1, fig.1, as Abratopdinium kerguelense.
---------------------------------------------------------------------------------------------------
Original description: Mao Shaozhi and Mohr, 1992
Description:
Circumcavate cysts, ambital outline circular, subcircular, to heartlike. Both periphragm and endophragm thin and hyaline; periphragm smooth or with features of low relief; endophragm smooth.
Paracingulum generally indicated by ridges only seen marginally, seldom by sparse verrucae seen on the surface. Parasulcus, where present, limited to the hypocyst.
Archeopyle intercalary [2a], standard hexastyle, iso-thetaform or rounded at each corner, AI = 0.53-0.63; operculum free.
Affinities:
Abratopdinium differs from any published genus in its thin and hyaline wall, small to medium size, archeopyle type, and rounded shape with no distinct horns. Nelsoniella, which may have a similar outline, has a thicker wall and is epicavate only.