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Thalassiphora kacharica
From Fensome et al., 2019:
Thalassiphora kacharica Vasilyeva in Vasilyeva et al., 2001, p.68, pl.2, figs.1–2 ex Vasilyeva in Andreeva-Grigorovich et al., 2011, p.32–33, pl.4, figs.9–12.
Holotype: Vasilyeva et al., 2001, pl.2, fig.1; Andreeva-Grigorovich et al., 2011, pl.4, fig.9.
This species was not validly published in Vasilyeva et al. (2001), since no English or Latin diagnosis was provided.
Age: Late Eocene–Early Oligocene.
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Original description: [Vasilyeva in Vasilyeva et al., 2001, ex Vasilyeva in Andreeva-Grigorovich et al., 2011] (translated from Russian):
Thalassiphora kacharica Vassilyeva sp. Nov. Tab. IV, 9-12
Name. Location: Kachar quarry, Kostanay region. Kazakhstan.
Diagnosis. Circumcavate subsphàerical cyst of intermediate size with small apical and antapical projections on pericyst. Endocyst large, oval. Periphragm smooth, dense, not perforate. Endophragm thin, smooth or granulate. Paratabulation indicated by archeopyle and paracingulum. Paracingulum indicated by fine folds of periphragm and more thin periphragm. Periarcheopyle semicircular, precingular. Pericel wide.
Description. Circumcavate cyst is spherical or oval in shape and medium in size. There is a thin projection at the apical pole. A small carina is developed in the antapical part of the pericyst. The hypocyst has a large opening. The endocyst is large, round-oval in shape, located in the central part or slightly displaced into the epicyst. Periphragm smooth dense transparent. The endophragm is thin, smooth or slightly granular, and forms folds. Signs of paratabulation are not clearly expressed. The paracingulum is marked by two parallel, barely protruding ridges of slightly thickened periphragm and a thinner layer of periphragm between them. The periarchaeopile is semicircular in shape, precingular in position. The pericelium is wide, equal in size over the entire sphere or slightly larger in the antapical part of the cyst.
Holotype. Table IV, 9. Rev. K-163, Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences.
Location. Kachar quarry, upper part of the Chegan formation (Kostanay region, Rudny).
Dimensions (µm). Holotype: pericyst length 84.6; pericyst width 79.2; endocyst length 51.2; endocyst width 48.5; keel height 8; cingulum width 6. Other specimens (3 specimens): pericyst length - 86-78; pericyst width 82-76; keel height 8-6.
Variability. The configuration of the pericyst and endocyst can vary from almost spherical to oval.
Comparison. In terms of the general appearance and density of the shells, this species is comparable with Thalassiphora delicata, Williams et Downie, 1966, but differs in the absence of such clear signs of paratabulation as in the latter.
Spreading. Kazakhstan, Southern Trans-Urals, Turgai Plain, roof of the Chegan and Tavda formations, Kurgan layers. Upper Eocene (Pri-Abonian), Lower Oligocene (Rupelian).
Thalassiphora kacharica Vasilyeva in Vasilyeva et al., 2001, p.68, pl.2, figs.1–2 ex Vasilyeva in Andreeva-Grigorovich et al., 2011, p.32–33, pl.4, figs.9–12.
Holotype: Vasilyeva et al., 2001, pl.2, fig.1; Andreeva-Grigorovich et al., 2011, pl.4, fig.9.
This species was not validly published in Vasilyeva et al. (2001), since no English or Latin diagnosis was provided.
Age: Late Eocene–Early Oligocene.
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Original description: [Vasilyeva in Vasilyeva et al., 2001, ex Vasilyeva in Andreeva-Grigorovich et al., 2011] (translated from Russian):
Thalassiphora kacharica Vassilyeva sp. Nov. Tab. IV, 9-12
Name. Location: Kachar quarry, Kostanay region. Kazakhstan.
Diagnosis. Circumcavate subsphàerical cyst of intermediate size with small apical and antapical projections on pericyst. Endocyst large, oval. Periphragm smooth, dense, not perforate. Endophragm thin, smooth or granulate. Paratabulation indicated by archeopyle and paracingulum. Paracingulum indicated by fine folds of periphragm and more thin periphragm. Periarcheopyle semicircular, precingular. Pericel wide.
Description. Circumcavate cyst is spherical or oval in shape and medium in size. There is a thin projection at the apical pole. A small carina is developed in the antapical part of the pericyst. The hypocyst has a large opening. The endocyst is large, round-oval in shape, located in the central part or slightly displaced into the epicyst. Periphragm smooth dense transparent. The endophragm is thin, smooth or slightly granular, and forms folds. Signs of paratabulation are not clearly expressed. The paracingulum is marked by two parallel, barely protruding ridges of slightly thickened periphragm and a thinner layer of periphragm between them. The periarchaeopile is semicircular in shape, precingular in position. The pericelium is wide, equal in size over the entire sphere or slightly larger in the antapical part of the cyst.
Holotype. Table IV, 9. Rev. K-163, Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences.
Location. Kachar quarry, upper part of the Chegan formation (Kostanay region, Rudny).
Dimensions (µm). Holotype: pericyst length 84.6; pericyst width 79.2; endocyst length 51.2; endocyst width 48.5; keel height 8; cingulum width 6. Other specimens (3 specimens): pericyst length - 86-78; pericyst width 82-76; keel height 8-6.
Variability. The configuration of the pericyst and endocyst can vary from almost spherical to oval.
Comparison. In terms of the general appearance and density of the shells, this species is comparable with Thalassiphora delicata, Williams et Downie, 1966, but differs in the absence of such clear signs of paratabulation as in the latter.
Spreading. Kazakhstan, Southern Trans-Urals, Turgai Plain, roof of the Chegan and Tavda formations, Kurgan layers. Upper Eocene (Pri-Abonian), Lower Oligocene (Rupelian).