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Rugasphaera operculata
Rugasphaera operculata Jiabo, 1978
Acritarch species
Now Bosedinia. Originally Rugasphaera, subsequently (and now) Bosedinia; see also Bosea (combination illegitimate).
Holotype: Jiabo, 1978, pl.40, fig.19
Age: Late Eocene-Oligocene
He Chengquan and Qian Zeshu, 1979: Bosea cf. operculata (Jiabo) comb. nov.
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.
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.
Acritarch species
Now Bosedinia. Originally Rugasphaera, subsequently (and now) Bosedinia; see also Bosea (combination illegitimate).
Holotype: Jiabo, 1978, pl.40, fig.19
Age: Late Eocene-Oligocene
He Chengquan and Qian Zeshu, 1979: Bosea cf. operculata (Jiabo) comb. nov.
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.
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.