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Isabelidinium acuminatum
From Fensome et al., 2019:
Isabelidinium acuminatum (Cookson and Eisenack, 1958, p.27, pl.4, figs.5–8) Stover and Evitt, 1978, p.109. Holotype: Cookson and Eisenack, 1958, pl.4, fig.5. Originally Deflandrea, subsequently Alterbia (combination illegitimate), thirdly Senegalinium, fourthly (and now) Isabelidinium. Age: Cenomanian–early Turonian.
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Locus typicus: Wapet"s Rough Range Well No. 8, W Australia
Stratum typicum: Cenomanian-Early Turoniuan
Original description: Cookson and Eisenack, 1958, p. 27: Deflandrea acuminata
Description: Theca broadly oval with convex sides or almost spherical, apex acuminate, antapex obliquely truncate, prolonged on one side into a small pointed horn. A transverse girdle is perceptible at the lateral margins of the theca. The capsule, which is always separated from the membrane of theca by a relatively wide space is approximately spherical, and slightly pointed on the side directed towards the apex of the theca. Both the internal and external membranes are smooth. A rounded or polygonal pylome is present above the apex of the capsule.
Dimensions: Range: theca 66-99 x 52-62 µm; capsule 38-47 x 38-47 µm.
Isabelidinium acuminatum (Cookson and Eisenack, 1958, p.27, pl.4, figs.5–8) Stover and Evitt, 1978, p.109. Holotype: Cookson and Eisenack, 1958, pl.4, fig.5. Originally Deflandrea, subsequently Alterbia (combination illegitimate), thirdly Senegalinium, fourthly (and now) Isabelidinium. Age: Cenomanian–early Turonian.
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Locus typicus: Wapet"s Rough Range Well No. 8, W Australia
Stratum typicum: Cenomanian-Early Turoniuan
Original description: Cookson and Eisenack, 1958, p. 27: Deflandrea acuminata
Description: Theca broadly oval with convex sides or almost spherical, apex acuminate, antapex obliquely truncate, prolonged on one side into a small pointed horn. A transverse girdle is perceptible at the lateral margins of the theca. The capsule, which is always separated from the membrane of theca by a relatively wide space is approximately spherical, and slightly pointed on the side directed towards the apex of the theca. Both the internal and external membranes are smooth. A rounded or polygonal pylome is present above the apex of the capsule.
Dimensions: Range: theca 66-99 x 52-62 µm; capsule 38-47 x 38-47 µm.