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Disphaeria velata
Disphaeria velata (Deflandre and Cookson, 1955) Yun, 1981
Originally Pterocystidiopsis, subsequently Thalassiphora, thirdly Disphaeria.
Taxonomic senior synonym: Pterospermopsis (as Thalassiphora) pelagica, according to Benedek and Gocht (1981, p.59) and Sarjeant (1981, p.117) - however, Brinkhuis and Biffi (1993, p.179) retained Disphaeria (as and now Thalassiphora) velata.
Holotype: Deflandre and Cookson 1955, pl. 8, fig. 8.
Stratum typicum: Early Tertiary
Locus typicus: Hay-Denmark railway deviation at 345 miles, W Australia
Original description: Deflandre and Cookson, 1955, p. 291: Pterocystidiopsis velata
Central shell ellipsoidal with a slightly thickened membrane, from which groups of radially arranged fibrils diverge towards the periphery of the relatively wide, delicate, finely reticulate membrane that envelops the shell.
Supplemental description: Cookson and Eisenack, 1961: Pterocystidiopsis velata
The shells of T. velata consist of a spherical to oval body and a thin and relatively wide saucershaped wing-like membrane. The body has a rather firm, faintly granular wall and a distinct pylome is developed. The body is attached to the central region of the wing by numerous root-like strands from which fibrils separate out in a fan-shaped manner.
Originally Pterocystidiopsis, subsequently Thalassiphora, thirdly Disphaeria.
Taxonomic senior synonym: Pterospermopsis (as Thalassiphora) pelagica, according to Benedek and Gocht (1981, p.59) and Sarjeant (1981, p.117) - however, Brinkhuis and Biffi (1993, p.179) retained Disphaeria (as and now Thalassiphora) velata.
Holotype: Deflandre and Cookson 1955, pl. 8, fig. 8.
Stratum typicum: Early Tertiary
Locus typicus: Hay-Denmark railway deviation at 345 miles, W Australia
Original description: Deflandre and Cookson, 1955, p. 291: Pterocystidiopsis velata
Central shell ellipsoidal with a slightly thickened membrane, from which groups of radially arranged fibrils diverge towards the periphery of the relatively wide, delicate, finely reticulate membrane that envelops the shell.
Supplemental description: Cookson and Eisenack, 1961: Pterocystidiopsis velata
The shells of T. velata consist of a spherical to oval body and a thin and relatively wide saucershaped wing-like membrane. The body has a rather firm, faintly granular wall and a distinct pylome is developed. The body is attached to the central region of the wing by numerous root-like strands from which fibrils separate out in a fan-shaped manner.