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Cleistosphaeridium xinjiangense
Cleistosphaeridium xinjiangense, Lentin and Williams, 1993, nom. nov. subst. pro Cleistosphaeridium elegans He Chengquan, 1991 non Cleistosphaeridium elegans He Chengquan, Zhu Shenzhao and Jin Guangxing in He Chengquan et al., 1989
Holotype: He Chenquan, 1991, pl.24, fig.5
Location and stratigraphy: Wuqia County Bashibulac; Qimugen fm, the lower member.
Age: Paleocene
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Original description: [He Chengquan, 1991]: (translated by Suning Hou, 07-01-2019):
Description:
Small body, outline nearly circular.
Wall is thin, transparent, layers unclear, smooth surface.
There are a lot of non-tabular thin processes (about 25), the shape is more consistent, solid, firm, width consistent or tapering distally, the distal end with 4 branches (For example the holotype) or a trifurcated; Branches weak spiny, up to 5 μm, end pointed; Individual processes end simple, perhaps related to the breakage of its distal part.
Acheopyle apical, tA type, formed by the absence of the apex, the edge angular. Operculum free.
Dimensions:
The total diameter 47.5 -50 μm, the body diameter of 30-34 μm, the process length of 10-15 μm (measured 2); the total diameter of the holotype 47.5 μm, the body diameter about 30μm, process length 10 μm.
Affinities:
The new species differs from Cleistosphaeridium tribuliferum in its nearly circular outline, shorter and solid processes, the latter’s were long and hollow.
Holotype: He Chenquan, 1991, pl.24, fig.5
Location and stratigraphy: Wuqia County Bashibulac; Qimugen fm, the lower member.
Age: Paleocene
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [He Chengquan, 1991]: (translated by Suning Hou, 07-01-2019):
Description:
Small body, outline nearly circular.
Wall is thin, transparent, layers unclear, smooth surface.
There are a lot of non-tabular thin processes (about 25), the shape is more consistent, solid, firm, width consistent or tapering distally, the distal end with 4 branches (For example the holotype) or a trifurcated; Branches weak spiny, up to 5 μm, end pointed; Individual processes end simple, perhaps related to the breakage of its distal part.
Acheopyle apical, tA type, formed by the absence of the apex, the edge angular. Operculum free.
Dimensions:
The total diameter 47.5 -50 μm, the body diameter of 30-34 μm, the process length of 10-15 μm (measured 2); the total diameter of the holotype 47.5 μm, the body diameter about 30μm, process length 10 μm.
Affinities:
The new species differs from Cleistosphaeridium tribuliferum in its nearly circular outline, shorter and solid processes, the latter’s were long and hollow.