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Bosedinia hepuensis
From Fensome et al., 2019:
Bosedinia hepuensis He Chengquan, 1984b, p.173–174, pl.8, figs.9–11. Holotype: He Chengquan, 1984b, pl.8, fig.10. Age:
Late Oligocene–Early Miocene.
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Original description: [He Chengquan, 1984b] (translated from Chinese with Google):
Bosedinia hepuensis (sp. nov.)
(Plate VIII, Figures 9-11)
Description: The shell is flat, with a nearly circular or triangular outline. The shell wall is thin, 0.6-1 micrometer thick, with one or two layers. The surface is divided into two decorative zones: (1) In the middle and rear part of the shell, the wrinkles are very long (5-7.5 micrometers), with a micro-wave shape, arranged roughly longitudinally, forming a circle of distinctive decorative bands, 7.5-10 micrometers wide, which may indicate a girdle. (2) Except for the girdle, the decorative patterns are short, mostly arranged horizontally, with fine serrations in the outline. The palate is of the ancient type, with a width close to or less than the shell width, which seems to indicate a certain angle: the palate is connected.
The shell is 40-50 microns long (including the mouth cover) and 37.5-45 microns wide; the holotype is 49 microns long and 42.5 microns wide.
Discussion: Numerous specimens show a longitudinally arranged wrinkled zone near the middle of the shell, forming a girdle. This indicates that these specimens are dinoflagellates, not apodigestives, and that they are cysts of dinoflagellates, not motile cells. The presence of a girdle suggests that the paleostome was apical. Therefore, Bosedinia includes specimens of both apodigestive and supracrustal paleostomes; this seems to be a taxonomic flaw, and further research is needed.
In terms of waist belt characteristics, it is somewhat similar to that of Palaeohystrichophora; however, the latter has thorn-like patterns on its surface and its ancient mouth is still unknown, so it may not be a member of this genus.
Origin: Hepu, Guangxi; upper part of Qiaotoupu Formation.
Bosedinia hepuensis He Chengquan, 1984b, p.173–174, pl.8, figs.9–11. Holotype: He Chengquan, 1984b, pl.8, fig.10. Age:
Late Oligocene–Early Miocene.
---------------------------------------------------------------------------------------------------
Original description: [He Chengquan, 1984b] (translated from Chinese with Google):
Bosedinia hepuensis (sp. nov.)
(Plate VIII, Figures 9-11)
Description: The shell is flat, with a nearly circular or triangular outline. The shell wall is thin, 0.6-1 micrometer thick, with one or two layers. The surface is divided into two decorative zones: (1) In the middle and rear part of the shell, the wrinkles are very long (5-7.5 micrometers), with a micro-wave shape, arranged roughly longitudinally, forming a circle of distinctive decorative bands, 7.5-10 micrometers wide, which may indicate a girdle. (2) Except for the girdle, the decorative patterns are short, mostly arranged horizontally, with fine serrations in the outline. The palate is of the ancient type, with a width close to or less than the shell width, which seems to indicate a certain angle: the palate is connected.
The shell is 40-50 microns long (including the mouth cover) and 37.5-45 microns wide; the holotype is 49 microns long and 42.5 microns wide.
Discussion: Numerous specimens show a longitudinally arranged wrinkled zone near the middle of the shell, forming a girdle. This indicates that these specimens are dinoflagellates, not apodigestives, and that they are cysts of dinoflagellates, not motile cells. The presence of a girdle suggests that the paleostome was apical. Therefore, Bosedinia includes specimens of both apodigestive and supracrustal paleostomes; this seems to be a taxonomic flaw, and further research is needed.
In terms of waist belt characteristics, it is somewhat similar to that of Palaeohystrichophora; however, the latter has thorn-like patterns on its surface and its ancient mouth is still unknown, so it may not be a member of this genus.
Origin: Hepu, Guangxi; upper part of Qiaotoupu Formation.