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Kallosphaeridium callosum
Kallosphaeridium callosum Dodekova 1994
Holotype: Dodekova 1994: pl. IV, fig. 7
Locus typicus: borehole R-1 Junak, depth 1605 m, Northeastern Bulgaria
Stratum typicum: Tica Fm., Middle Tithonian, Chitinoidella Zone
Dimensions (in µm). Holotype: diameter: 72. Range: diameter: 68-72 (10 specimens measured).
Description: Dodekova 1994, p. 22-23:
A spherical to subspherical proximate cyst, weakly flattened dorso-ventrally. The autophragm is smooth or with uncertain foveolae. The latter may be owing to a bacterial intervention, since some of the specimens possess secondary perforations (pl. IV, fig. 8). The autophragm is thick (1.5--2 m) with rare folds (pl. IV, fig. 9). The tabulation indicated by the archeopyle only. The archeopyle is apical, type tA with angular margin. Operculum attached with a thicker place in the very center of the apex.
Remarks. Dodekova 1994, p. 22-23:
Kallosphaeridium callosum sp. n. is similar and may be conspecific with Callosphaeridium .sp. A from Late Tithonian, Kawhia, New Zealand (Helby et al., 1988, p. 151. fig 2J). The new species is very close to the Kimmeridgian cyst described by Davey (1987, p. 40, pl. 2, figs. 14, 15) as Levisphaera crassicingulata Burger, 1980b). Davey noted the lack of the cingular thickening on his specimens, observed in the Australian type material (Burger, 1980b, p. 268). They are also rather spherical than ovoidal as the Burger"s specimens and the figured cysts possess all attached operculum. Finally Levisphaera crassisingulata sensu Davey, 1987 may
be conspecific with Kallosphaeridium callosum.
Occurrence. Boreholes: R-1 Junak (depth 1536 m, Late Tithonian, Crassicollaria Zone; depth 1605 m, Middle Tithonian Tica Fm.); R-3 Junak (depth 1695.5 m, Middle Tithonian, Tica Fm.); R-6 Sultanci (depth 1664 m, Tica Fm., boundary Late Tithonian-Berriasian, Calpionella Zone, C. alpina Subzone).
Holotype: Dodekova 1994: pl. IV, fig. 7
Locus typicus: borehole R-1 Junak, depth 1605 m, Northeastern Bulgaria
Stratum typicum: Tica Fm., Middle Tithonian, Chitinoidella Zone
Dimensions (in µm). Holotype: diameter: 72. Range: diameter: 68-72 (10 specimens measured).
Description: Dodekova 1994, p. 22-23:
A spherical to subspherical proximate cyst, weakly flattened dorso-ventrally. The autophragm is smooth or with uncertain foveolae. The latter may be owing to a bacterial intervention, since some of the specimens possess secondary perforations (pl. IV, fig. 8). The autophragm is thick (1.5--2 m) with rare folds (pl. IV, fig. 9). The tabulation indicated by the archeopyle only. The archeopyle is apical, type tA with angular margin. Operculum attached with a thicker place in the very center of the apex.
Remarks. Dodekova 1994, p. 22-23:
Kallosphaeridium callosum sp. n. is similar and may be conspecific with Callosphaeridium .sp. A from Late Tithonian, Kawhia, New Zealand (Helby et al., 1988, p. 151. fig 2J). The new species is very close to the Kimmeridgian cyst described by Davey (1987, p. 40, pl. 2, figs. 14, 15) as Levisphaera crassicingulata Burger, 1980b). Davey noted the lack of the cingular thickening on his specimens, observed in the Australian type material (Burger, 1980b, p. 268). They are also rather spherical than ovoidal as the Burger"s specimens and the figured cysts possess all attached operculum. Finally Levisphaera crassisingulata sensu Davey, 1987 may
be conspecific with Kallosphaeridium callosum.
Occurrence. Boreholes: R-1 Junak (depth 1536 m, Late Tithonian, Crassicollaria Zone; depth 1605 m, Middle Tithonian Tica Fm.); R-3 Junak (depth 1695.5 m, Middle Tithonian, Tica Fm.); R-6 Sultanci (depth 1664 m, Tica Fm., boundary Late Tithonian-Berriasian, Calpionella Zone, C. alpina Subzone).