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Bohaidina micirugosa
From Fensome et al., 2019:
Bohaidina micirugosa (He Chengquan, 1984b, p.158, pl.2, figs.12–17) He Chengquan et al., 2009, p.454. Holotype: He
Chengquan, 1984b, pl.2, fig.14. Originally Prominangularia, subsequently (and now) Bohaidina. Taxonomic
senior synonym: Bohaidina rugosa, according to Sun Xuekun (1994, p.71) — however, He Chengquan et al. (2009,
p.454) retained this species separately. Age: Tertiary.
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Original description: [He Chengquan, 1984b] (translated with Google):
Prominangularia micirugosa (sp. nov.)
(Plate II, Figures 12-17)
Description: The shell has a rounded triangular outline, with generally concave edges and wide, rounded or flat corners. The shell wall is thin; the surface is short and wrinkled, some of which may be connected and not high, with a finely serrated outline. A small number of grains may be seen. The corners on either side of the waist region are weakly raised, and when flattened, they become sickle-shaped. There is no transverse groove, but a transverse fold is often present in the waist region, which may be related to the transverse groove. A few specimens have a palaeostoma, with slightly curved, nearly straight, or subangular margins; the palaeostoma type is undetermined; the operculum is connected. A nucleus is present.
The shell is 32.5-40 microns long and 45-47.5 microns wide; the holotype is 50 microns long and 37.5 microns wide; the paratype is 45 microns long and 40 microns wide.
Discussion: Currently, a few specimens with palaeostomatous features are tentatively accepted for this species. This new species is distinguished from other species of the genus by its short, wrinkled ornamentation.
Origin: Xuwen, Guangdong, the Liushagang Formation of the Lower Tertiary; Shangsi, Guangxi, the second member of the Yongning Group.
Bohaidina micirugosa (He Chengquan, 1984b, p.158, pl.2, figs.12–17) He Chengquan et al., 2009, p.454. Holotype: He
Chengquan, 1984b, pl.2, fig.14. Originally Prominangularia, subsequently (and now) Bohaidina. Taxonomic
senior synonym: Bohaidina rugosa, according to Sun Xuekun (1994, p.71) — however, He Chengquan et al. (2009,
p.454) retained this species separately. Age: Tertiary.
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Original description: [He Chengquan, 1984b] (translated with Google):
Prominangularia micirugosa (sp. nov.)
(Plate II, Figures 12-17)
Description: The shell has a rounded triangular outline, with generally concave edges and wide, rounded or flat corners. The shell wall is thin; the surface is short and wrinkled, some of which may be connected and not high, with a finely serrated outline. A small number of grains may be seen. The corners on either side of the waist region are weakly raised, and when flattened, they become sickle-shaped. There is no transverse groove, but a transverse fold is often present in the waist region, which may be related to the transverse groove. A few specimens have a palaeostoma, with slightly curved, nearly straight, or subangular margins; the palaeostoma type is undetermined; the operculum is connected. A nucleus is present.
The shell is 32.5-40 microns long and 45-47.5 microns wide; the holotype is 50 microns long and 37.5 microns wide; the paratype is 45 microns long and 40 microns wide.
Discussion: Currently, a few specimens with palaeostomatous features are tentatively accepted for this species. This new species is distinguished from other species of the genus by its short, wrinkled ornamentation.
Origin: Xuwen, Guangdong, the Liushagang Formation of the Lower Tertiary; Shangsi, Guangxi, the second member of the Yongning Group.