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Inversidinium
From Williams et al., 2017:
[Inversidinium, McLean, 1973b, p. 730
Type species: Inversidinium exilimurum, McLean, 1973b (pl.90, figs.1–2)]
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Original description: [McLean, 1973]:
Diagnosis:
Bi-layered cyst; periblast outline peridinioid with pointed apex and truncated antapex; lacks indications of tabulation- endoblast outline variable. Convex-outward folds of the periblast reflect cingulum and sulcus. Excystment apparatus (= archeopyle?) antapical; forms by rupture of antapical tips of periblast and endoblast. Periphragm and endophragm externally smooth to granulose.
[Inversidinium, McLean, 1973b, p. 730
Type species: Inversidinium exilimurum, McLean, 1973b (pl.90, figs.1–2)]
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Original description: [McLean, 1973]:
Diagnosis:
Bi-layered cyst; periblast outline peridinioid with pointed apex and truncated antapex; lacks indications of tabulation- endoblast outline variable. Convex-outward folds of the periblast reflect cingulum and sulcus. Excystment apparatus (= archeopyle?) antapical; forms by rupture of antapical tips of periblast and endoblast. Periphragm and endophragm externally smooth to granulose.