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Caledonidinium
From Williams et al., 2017:
[Caledonidinium, Reid, 1974, p. 589
Type species: Caledonidinium vermiculatum, Reid, 1974 (pl.1, figs.4–5)]
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Original description: [Reid, 1974]:
Diagnosis:
Test with a circular outline and no projections. Wall thick and two layered. Inner layer thin and compact with solid bases for the radial rods (resembling the columellae of pollen) which penetrate the outer layer. Outer layer thick and less dense between the radial rods which penetrate to the surface. Archeopyle precingular formed by the loss of two plates. No tabulation visible.
[Caledonidinium, Reid, 1974, p. 589
Type species: Caledonidinium vermiculatum, Reid, 1974 (pl.1, figs.4–5)]
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Original description: [Reid, 1974]:
Diagnosis:
Test with a circular outline and no projections. Wall thick and two layered. Inner layer thin and compact with solid bases for the radial rods (resembling the columellae of pollen) which penetrate the outer layer. Outer layer thick and less dense between the radial rods which penetrate to the surface. Archeopyle precingular formed by the loss of two plates. No tabulation visible.