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Bosedinia micirugosa
From Fensome et al., 2019:
Bosedinia micirugosa He Chengquan, 1984b, p.174–175, pl.7, figs.16–20; pl.8, figs.6–8. Holotype: He Chengquan, 1984b,
pl.7, fig.16. Age: latest Eocene–Early Miocene.
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Original description: [He Chengquan, 1984b] (translated from Chinese with Google):
Bosedinia micirugosa (sp. nov.)
(Plate VII, Figures 16-20; Plate VIII, Figures 6-8)
Description: The shell is medium to small, with a nearly circular to triangular outline. The shell wall is thin, single or double-layered; the surface is finely wrinkled, straight or slightly curved. Some wrinkles have slightly enlarged, vermiform tips, giving the surface a grainy appearance. Some wrinkles may be connected, low, and slightly serrated, about 0.6 microns wide and 2-3.5 microns long. In some specimens, wrinkles may be obscured by corrosion, resulting in a reticular appearance. The palate is large, perhaps subapical or epiphyseal, with a width equal to or less than the shell width. The palate outline is nearly straight; the operculum is connected. It may be wrinkled or contain a nucleus.
Shell diameter 30-52.5 μm; holotype diameter 47.5 μm.
Discussion: This species is distinguished from Bosedinia operculata (Jiabo) by its shorter, denser wrinkles. Based on shell size, this species can be divided into two subspecies: the fine-wrinkled subspecies and the small subspecies.
Origin: Shangsi, Guangxi, the second section of the Yongning Group (the first section is sporadically seen); the northern suburbs of Nanning, the lower coal-bearing section of the Yongning Group; Hepu, the upper section of the Qiaotoupu Formation to the bottom of the Shagang Formation; Xuwen, Guangdong, the Liushagang Formation.
Bosedinia micirugosa He Chengquan, 1984b, p.174–175, pl.7, figs.16–20; pl.8, figs.6–8. Holotype: He Chengquan, 1984b,
pl.7, fig.16. Age: latest Eocene–Early Miocene.
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Original description: [He Chengquan, 1984b] (translated from Chinese with Google):
Bosedinia micirugosa (sp. nov.)
(Plate VII, Figures 16-20; Plate VIII, Figures 6-8)
Description: The shell is medium to small, with a nearly circular to triangular outline. The shell wall is thin, single or double-layered; the surface is finely wrinkled, straight or slightly curved. Some wrinkles have slightly enlarged, vermiform tips, giving the surface a grainy appearance. Some wrinkles may be connected, low, and slightly serrated, about 0.6 microns wide and 2-3.5 microns long. In some specimens, wrinkles may be obscured by corrosion, resulting in a reticular appearance. The palate is large, perhaps subapical or epiphyseal, with a width equal to or less than the shell width. The palate outline is nearly straight; the operculum is connected. It may be wrinkled or contain a nucleus.
Shell diameter 30-52.5 μm; holotype diameter 47.5 μm.
Discussion: This species is distinguished from Bosedinia operculata (Jiabo) by its shorter, denser wrinkles. Based on shell size, this species can be divided into two subspecies: the fine-wrinkled subspecies and the small subspecies.
Origin: Shangsi, Guangxi, the second section of the Yongning Group (the first section is sporadically seen); the northern suburbs of Nanning, the lower coal-bearing section of the Yongning Group; Hepu, the upper section of the Qiaotoupu Formation to the bottom of the Shagang Formation; Xuwen, Guangdong, the Liushagang Formation.