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Bosea operculata
Bosea operculata, (Jiabo, 1978), He Chengquan and Qian Zeshu, 1979
Combination not validly published since He Chengquan and Qian Zeshu, 1979, did not fully reference the basionym.
Now Bosedinia. Originally Rugasphaera, an acritarch genus, subsequently Bosea (combination illegitimate), thirdly (and now) Bosedinia.
Holotype: Jiabo, 1978, pl.40, fig.19
Age: Late Eocene-Oligocene
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Description: [He Chengquan and Qian Zeshu, 1979]:
Description:
The tract has a subcircular to rounded triangular ambital outline.
It possesses a large "pylome", which may, however, represent an epitractal archaeopyle. The operculum is attached (or may be lost). When the operculum has been lost, the margin of the opening is not straight, and its central area protrudes outward in an arc-like manner.
The hypotract is larger than the epitract. The wall of the tract is comparatively thin and may be folded. Rugose ornamentation is observed, with the rugulae being relatively long and curving to varying degrees, some of them being "U"-shaped and others being gently undulating; the rugulae are of different thicknesses and are arranged in vermicular fashion; some of the rugulae appear like short spines (length up to 1 µm) on the outer contour line. [The tract] contains a nucleus-like structure. The diameter of the tract is 40 - 52 µm.
Remarks:
These specimens have features comparable to Rugosphaera operculata Jiabo (1978). Since in some of the specimens the operculum is lost and the edges of the folds are fairly high, sometimes extending, beyond the outer contour line, these specimens are being identified as a comparative species.
Combination not validly published since He Chengquan and Qian Zeshu, 1979, did not fully reference the basionym.
Now Bosedinia. Originally Rugasphaera, an acritarch genus, subsequently Bosea (combination illegitimate), thirdly (and now) Bosedinia.
Holotype: Jiabo, 1978, pl.40, fig.19
Age: Late Eocene-Oligocene
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Description: [He Chengquan and Qian Zeshu, 1979]:
Description:
The tract has a subcircular to rounded triangular ambital outline.
It possesses a large "pylome", which may, however, represent an epitractal archaeopyle. The operculum is attached (or may be lost). When the operculum has been lost, the margin of the opening is not straight, and its central area protrudes outward in an arc-like manner.
The hypotract is larger than the epitract. The wall of the tract is comparatively thin and may be folded. Rugose ornamentation is observed, with the rugulae being relatively long and curving to varying degrees, some of them being "U"-shaped and others being gently undulating; the rugulae are of different thicknesses and are arranged in vermicular fashion; some of the rugulae appear like short spines (length up to 1 µm) on the outer contour line. [The tract] contains a nucleus-like structure. The diameter of the tract is 40 - 52 µm.
Remarks:
These specimens have features comparable to Rugosphaera operculata Jiabo (1978). Since in some of the specimens the operculum is lost and the edges of the folds are fairly high, sometimes extending, beyond the outer contour line, these specimens are being identified as a comparative species.