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Senoniasphaera turensis
From Fensome et al., 2019:
Senoniasphaera turensis Vasilyeva in Andreeva-Grigorovich et al., 2011, p.34, pl.2, fig.6. Holotype: Andreeva-Grigorovich et al., 2011, pl.2, fig.6; Fensome et al., 2019a, fig.17J. Questionable assignment: Fensome et al. (2019a. p.44–45). Age: Danian.
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Original description (Andreeva-Grigorovich et al., 2011):
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Comments Fensome et al., 2019a:
Vasilyeva in Andreeva-Grigorovich et al. (2011, p. 34) provided the following description for this species:
Pericyst almost round, with barely noticeable antapical horns. Pericyst outline seems to be jagged, slightly wavy. Endocyst is round, coinciding in shape with pericyst. Pericoel is very narrow, slightly expanded antapically. Periphragm is quite dense, transparent and forms wrinkles over the whole surface and, typical for this species, has small folds over the whole pericyst outline, which look like a range of open perforations in the pericoel. Periphragm is occasionally perforated. Endophragm is quite dense, single-layered, smooth. Periarchaeopyle is apical (type tA). Operculum is attached or absent. Archaeopyle outline is uneven. Paratabulation is expressed by the archaeopyle; small wrinkles of the periphragm indicate the paracingulum. [Translation courtesy Alina Iakovleva, personal communucation]
It is unclear whether connections exist between the wall layers, both from the description and illustration. For this reason, because the pericoel is narrower than is typical for Senoniasphaera, and because the single specimen illustrated shows no unequivocal features of areoligeracean affinity, we question the assignment of this species to Senoniasphaera.
Stratigraphical occurrence. This species was originally described from the Danian of the southern Ural Mountains, Russia.
Senoniasphaera turensis Vasilyeva in Andreeva-Grigorovich et al., 2011, p.34, pl.2, fig.6. Holotype: Andreeva-Grigorovich et al., 2011, pl.2, fig.6; Fensome et al., 2019a, fig.17J. Questionable assignment: Fensome et al. (2019a. p.44–45). Age: Danian.
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Original description (Andreeva-Grigorovich et al., 2011):
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Comments Fensome et al., 2019a:
Vasilyeva in Andreeva-Grigorovich et al. (2011, p. 34) provided the following description for this species:
Pericyst almost round, with barely noticeable antapical horns. Pericyst outline seems to be jagged, slightly wavy. Endocyst is round, coinciding in shape with pericyst. Pericoel is very narrow, slightly expanded antapically. Periphragm is quite dense, transparent and forms wrinkles over the whole surface and, typical for this species, has small folds over the whole pericyst outline, which look like a range of open perforations in the pericoel. Periphragm is occasionally perforated. Endophragm is quite dense, single-layered, smooth. Periarchaeopyle is apical (type tA). Operculum is attached or absent. Archaeopyle outline is uneven. Paratabulation is expressed by the archaeopyle; small wrinkles of the periphragm indicate the paracingulum. [Translation courtesy Alina Iakovleva, personal communucation]
It is unclear whether connections exist between the wall layers, both from the description and illustration. For this reason, because the pericoel is narrower than is typical for Senoniasphaera, and because the single specimen illustrated shows no unequivocal features of areoligeracean affinity, we question the assignment of this species to Senoniasphaera.
Stratigraphical occurrence. This species was originally described from the Danian of the southern Ural Mountains, Russia.