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Cassiculosphaeridia cribrosa
Cassiculosphaeridia ? cribrosa, Dodekova, 1994
Holotype: Dodekova 1994: pl. II, fig. 1-3
Locus typicus: borehole R-7 Sultanci, depth 1765 m, Northeastern Bulgaria
Stratum typicum: Tica Formation, Late Tithollian, Crassicollaria Zone
Occurrence: Boreholes: R-3 Brest (depth 1747 m, Middle Tithonian , Kaspican Fm.); R-7 Sultanci (depth 1765 m, Tica Fm., Late Tithonian, Crassicullaria Zone); R-l Junak (depth 1605 m, Tica Fm., Middle Tithonian, Chitinoidella Zone); R-3 Junak (depth 1765 m, Tica Fm., Early Tithonian)
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Original description: [Dodekova 1994, p. 20]:
Description:
A spherical to subspherical proximate cyst. The autophragm is ornamented by an irregular reticulum composed of low, narrow muri outlining circular to irregularly polygonal lumina, variable in dimensions and shape. The cingulum is vague, on some specimens is discernible by linearely arranged lumina and muri.
The tabulation is expressed by the archeopyle and the cingulum.
The archeopyle is apical, type tA, large with zigzag principal margin. One specimen only exhibits accessory archeopyle sutures and they may be due to secondary breakages. But in this breakage the six precingular plates are formed. Free opercula exist in palynological slides.
Dimensions (in µm):
Holotype: length (without apex) 79, height of ridges 4.
Range: diameter 79-94, height of ridges 3-7 (10 specimens measured).
Remarks:
Cassiculosphaeridia? cribrosa sp. n. is placed in the genus Cassiculosphaeridia with some incertitude. The generic diagnosis includes a small archeopyle and a cingulum disposed in the upper part of the cyst, with epicyst - hypocyst ratio 1 to 2 or 1 to 3. C. reticulata Davey, 1969a and C. magna Davey, 1974 differ from the new species, by their coarse reticulum and a high disposes cingulum. C. pygmaea Stevens (1987, p. 183, figs. L-Q) has similar reticulum to that of C? cribrosa but its average size is smaller, ellipsoidal in shape, lacks indication of a cingulum the figured specimens have adherent opercula. C. delicala Stover & Helby (1987, p 103, fig. 2) has an imperfect reticulum and a tabulation expressed by sutural reticulate bands. A specimen similar and may be conspecific to C? cribrosa is figured as C. magna by Ioannides et al. (1976, pl. 1, fig. 7).
Holotype: Dodekova 1994: pl. II, fig. 1-3
Locus typicus: borehole R-7 Sultanci, depth 1765 m, Northeastern Bulgaria
Stratum typicum: Tica Formation, Late Tithollian, Crassicollaria Zone
Occurrence: Boreholes: R-3 Brest (depth 1747 m, Middle Tithonian , Kaspican Fm.); R-7 Sultanci (depth 1765 m, Tica Fm., Late Tithonian, Crassicullaria Zone); R-l Junak (depth 1605 m, Tica Fm., Middle Tithonian, Chitinoidella Zone); R-3 Junak (depth 1765 m, Tica Fm., Early Tithonian)
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Original description: [Dodekova 1994, p. 20]:
Description:
A spherical to subspherical proximate cyst. The autophragm is ornamented by an irregular reticulum composed of low, narrow muri outlining circular to irregularly polygonal lumina, variable in dimensions and shape. The cingulum is vague, on some specimens is discernible by linearely arranged lumina and muri.
The tabulation is expressed by the archeopyle and the cingulum.
The archeopyle is apical, type tA, large with zigzag principal margin. One specimen only exhibits accessory archeopyle sutures and they may be due to secondary breakages. But in this breakage the six precingular plates are formed. Free opercula exist in palynological slides.
Dimensions (in µm):
Holotype: length (without apex) 79, height of ridges 4.
Range: diameter 79-94, height of ridges 3-7 (10 specimens measured).
Remarks:
Cassiculosphaeridia? cribrosa sp. n. is placed in the genus Cassiculosphaeridia with some incertitude. The generic diagnosis includes a small archeopyle and a cingulum disposed in the upper part of the cyst, with epicyst - hypocyst ratio 1 to 2 or 1 to 3. C. reticulata Davey, 1969a and C. magna Davey, 1974 differ from the new species, by their coarse reticulum and a high disposes cingulum. C. pygmaea Stevens (1987, p. 183, figs. L-Q) has similar reticulum to that of C? cribrosa but its average size is smaller, ellipsoidal in shape, lacks indication of a cingulum the figured specimens have adherent opercula. C. delicala Stover & Helby (1987, p 103, fig. 2) has an imperfect reticulum and a tabulation expressed by sutural reticulate bands. A specimen similar and may be conspecific to C? cribrosa is figured as C. magna by Ioannides et al. (1976, pl. 1, fig. 7).