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Inversidinium
From Fensome et al., 2019:
"Inversidinium", McLean, 1973b, p.730.
Taxonomic senior synonym: Palaeotetradinium, according to Stover and Evitt (1978, p.70–71).
Type: McLean, 1973b, pl.90, figs.1–2, as Inversidinium exilimurum.
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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.
Taxonomic senior synonym: Palaeotetradinium, according to Stover and Evitt (1978, p.70–71).
Type: McLean, 1973b, pl.90, figs.1–2, as Inversidinium exilimurum.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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.