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Abratopdinium
From Williams et al., 2017:
[Abratopdinium, Mao Shaozhi and Mohr, 1992, p. 317-318
Type species: Abratopdinium kerguelense, Mao Shaozhi and Mohr, 1992 (pl.1, fig.1)]
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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 species: Abratopdinium kerguelense, Mao Shaozhi and Mohr, 1992 (pl.1, fig.1)]
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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.