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Pseudokomewuia communis
Pseudokomewuia communis (He Chengquan, 1984b, p.159, pl.5, figs.18–20) He Chengquan et al., 2009, p.534.
Originally Pareodinia, subsequently Pareodinia?, thirdly (and now) Pseudokomewuia.
Holotype: He Chengquan, 1984b, pl.5, fig.18.
Age: middle-late Oligocene.
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Original description: [He Chengquan, 1984b] (translated from Chinese with Google):
Pareodinia communis (sp. nov.)
(Plate V, Figures 18-20)
Description: The shell is approximately taro-shaped in outline. It has a strong apex (6-7.5 µm long, about 7.5 µm wide at the base and about 5 µm wide at the distal end), the base communicating with the shell cavity, and the distal end being blunt. The shell wall is thin and single-layered; the surface is granular, coarse or fine, with the coarse ones being about 0.7 µm and about 0.5 µm high. The granules may sometimes connect in the middle of the shell. There are no longitudinal or transverse grooves, plates, or endosomes, and no palaeoostium is observed. The shell may be wrinkled or contain a nucleus.
The shell is 47.5-55 microns long (including corners) and 38-52 microns wide; the holotype is 50 microns long (including corners) and 42.5 microns wide, with the top corner about 6 microns long and 5-7.5 microns wide; the paratype is 52 microns long and 52 microns wide, with the top corner 7.5 microns long and 5-7.5 microns wide.
Discussion This species differs from Pareodinia ceratophora Deflandre by its prominent granular shell wall and short apex angle. P. aphelia Cookson et Eisenack contains members with both granular and smooth shell walls (patterns) and may represent both types; however, these individuals are larger than the present species (66–114 μm long, 33–62 μm wide) and date to the Middle Jurassic–Early Cretaceous, thus being distinct.
Origin: Shangsi, Guangxi, the second section of the Yongning Group; the lower coal-bearing section of the Yongning Group in the northern suburbs of Nanning.
Originally Pareodinia, subsequently Pareodinia?, thirdly (and now) Pseudokomewuia.
Holotype: He Chengquan, 1984b, pl.5, fig.18.
Age: middle-late Oligocene.
--------------------------------------------------------------------------------------------------------------
Original description: [He Chengquan, 1984b] (translated from Chinese with Google):
Pareodinia communis (sp. nov.)
(Plate V, Figures 18-20)
Description: The shell is approximately taro-shaped in outline. It has a strong apex (6-7.5 µm long, about 7.5 µm wide at the base and about 5 µm wide at the distal end), the base communicating with the shell cavity, and the distal end being blunt. The shell wall is thin and single-layered; the surface is granular, coarse or fine, with the coarse ones being about 0.7 µm and about 0.5 µm high. The granules may sometimes connect in the middle of the shell. There are no longitudinal or transverse grooves, plates, or endosomes, and no palaeoostium is observed. The shell may be wrinkled or contain a nucleus.
The shell is 47.5-55 microns long (including corners) and 38-52 microns wide; the holotype is 50 microns long (including corners) and 42.5 microns wide, with the top corner about 6 microns long and 5-7.5 microns wide; the paratype is 52 microns long and 52 microns wide, with the top corner 7.5 microns long and 5-7.5 microns wide.
Discussion This species differs from Pareodinia ceratophora Deflandre by its prominent granular shell wall and short apex angle. P. aphelia Cookson et Eisenack contains members with both granular and smooth shell walls (patterns) and may represent both types; however, these individuals are larger than the present species (66–114 μm long, 33–62 μm wide) and date to the Middle Jurassic–Early Cretaceous, thus being distinct.
Origin: Shangsi, Guangxi, the second section of the Yongning Group; the lower coal-bearing section of the Yongning Group in the northern suburbs of Nanning.