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Bosedinia laevigata
From Fensome et al., 2019:
Bosedinia laevigata (Jiabo, 1978, p.126–127, pl.32, fig.23 ex He Chengquan and Qian Zeshu, 1979, p.179) He Chengquan,
1984b, p.174. Holotype: Jiabo, 1978, pl.32, fig.23. Originally Palaeostomocystis laevigata (name illegitimate;
Appendix A), subsequently Bosea laevigata (generic name illegitimate), thirdly Fromea laevigata (combination
illegitimate; Appendix A), fourthly Fromea psilata (Appendix A), fifthly (and now) Bosedinia laevigata. The name
Palaeostomocystis laevigata was illegitimate in Jiabo (1978), since that name is preoccupied. See Bosea laevigata
for further discussion. Age: early Tertiary.
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Description as Bosea laevigata: [He Chengquan and Qian Zeshu, 1979]:
Description:
The ambital outline of the tract is ovoidal or subcircular to rounded triangular.
The tract possesses a "pylome" (the opening shown in Fig. 8 appears to be angular), which is usually situated at the broadest part of the tract; the operculum is either attached or lost.
No apical or antapical horns are observed, nor a cingulum or tabulation.
The hypotract is larger than the epitract. The wall of the tract is relatively thin, as it measures approximately 1.2 µm in thickness; it is divided into two layers that are more or less equally thick; the surface of the wall is almost smooth and often bears folds. [The tract] may contain a yellow-coloured structure suggestive of a nucleus. The diameter of the tract ranges from 35 - 60 µm.
Bosedinia laevigata (Jiabo, 1978, p.126–127, pl.32, fig.23 ex He Chengquan and Qian Zeshu, 1979, p.179) He Chengquan,
1984b, p.174. Holotype: Jiabo, 1978, pl.32, fig.23. Originally Palaeostomocystis laevigata (name illegitimate;
Appendix A), subsequently Bosea laevigata (generic name illegitimate), thirdly Fromea laevigata (combination
illegitimate; Appendix A), fourthly Fromea psilata (Appendix A), fifthly (and now) Bosedinia laevigata. The name
Palaeostomocystis laevigata was illegitimate in Jiabo (1978), since that name is preoccupied. See Bosea laevigata
for further discussion. Age: early Tertiary.
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Description as Bosea laevigata: [He Chengquan and Qian Zeshu, 1979]:
Description:
The ambital outline of the tract is ovoidal or subcircular to rounded triangular.
The tract possesses a "pylome" (the opening shown in Fig. 8 appears to be angular), which is usually situated at the broadest part of the tract; the operculum is either attached or lost.
No apical or antapical horns are observed, nor a cingulum or tabulation.
The hypotract is larger than the epitract. The wall of the tract is relatively thin, as it measures approximately 1.2 µm in thickness; it is divided into two layers that are more or less equally thick; the surface of the wall is almost smooth and often bears folds. [The tract] may contain a yellow-coloured structure suggestive of a nucleus. The diameter of the tract ranges from 35 - 60 µm.