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Okerisphaeridium
From Williams et al., 2017:
[Okerisphaeridium, Kunz, 1990, p. 22
Type species: Okerisphaeridium fragile, Kunz, 1990 (pl.4, figs.11a–b; text-figs.9a–c)]
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Original description: [Kunz, 1990]: (Translation: LPP):
Diagnosis:
Cysts proximate, sphaeroidal to subsphaeroidal. Areation gonyaulacoid, areation formula ?pr, 4`, 0a, 6``, 6c, 6```, 1p, 1````, xs. Archeopyle results of the loss of four precingular areas. Archaeopyle formula 2``+3``+4``+5``. Operculum secate and sovate. Opercular formula 2``(s)+3``(s)+4``(s)+5``(s). Wall composed of pedium and luxuriate ornaments. Sutural elements or horns not developed.
Affinities:
The most similar genera are Dissiliodinium Drugg, 1978 and Occisucysta Gitmez, 1970 emend. Jan du Chêne et al., 1986. Dissiliodinium shows areation on the epicyst only and a different archaeopyle (six areas involved). Occisucysta has an 2``+3`` archaeopyle, an apical horn and finate ridges.
[Okerisphaeridium, Kunz, 1990, p. 22
Type species: Okerisphaeridium fragile, Kunz, 1990 (pl.4, figs.11a–b; text-figs.9a–c)]
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Original description: [Kunz, 1990]: (Translation: LPP):
Diagnosis:
Cysts proximate, sphaeroidal to subsphaeroidal. Areation gonyaulacoid, areation formula ?pr, 4`, 0a, 6``, 6c, 6```, 1p, 1````, xs. Archeopyle results of the loss of four precingular areas. Archaeopyle formula 2``+3``+4``+5``. Operculum secate and sovate. Opercular formula 2``(s)+3``(s)+4``(s)+5``(s). Wall composed of pedium and luxuriate ornaments. Sutural elements or horns not developed.
Affinities:
The most similar genera are Dissiliodinium Drugg, 1978 and Occisucysta Gitmez, 1970 emend. Jan du Chêne et al., 1986. Dissiliodinium shows areation on the epicyst only and a different archaeopyle (six areas involved). Occisucysta has an 2``+3`` archaeopyle, an apical horn and finate ridges.