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Hystrichosphaeridium cylindratum
Hystrichosphaeridium cylindratum Morgenroth, 1966
Sr. homonym of Hystrichosphaeridium cylindratum Brideaux, 1971.
Holotype: Morgenroth 1966a, Pl. 8, figs. 3,4
Locus typicus: Katharinenhof Fehmarn.
Stratum typicum: Lower Eocene (?2).
Age: Early Eocene
Translation Morgenroth 1966a: GSC
Original diagnosis: Morgenroth 1966a, p.30: Hystrichosphaeridium cylindricatum
A species of the genus Hystrichosphaeridium with a thin-walled capsule which is covered with 20 to 30 strongly cylindrical relatively long thin-walled processes which are distally open, the lips of which are covered with tiny hooklets.
Original description: Morgenroth 1966a, p.30: Hystrichosphaeridium cylindricatum
The spherical, occasionally ellipsoidal capsule is very weakly granular and colorless (the axial ratio of the ellipsoidal capsule can reach a value of 1 to 1.6). From the extremely thin-walled capsule arise 20 to 30 strongly cylindrical hollow processes whose distal opening is generally covered with tiny hooklets. Sometimes, however, the margin of the opening is completely undistorted (regular or smooth). The wall of the processes shows no structure. The development of the processes seems extremely constant, only their length can in some specimens differ by a maximum of 7 microns.
Comparisons: Morgenroth 1966a, p.30
In view of the process type as well as the capsule structure, the new species seems to belong to the "Tubiferen" since it is closely related in the Lower Eocene to Hvstrichosphaeridium tubiferum Ehrenberg. The difference lies in the cyllndrical and slightly longer processes. Forms that are transitional to Hystrichosphaeridium tubiferum have not been found. There is a strong resemblance ln the structure of the processes to Hystrichosphaeridium siphoniphorum Cookson and Eisenack 1958 from the Lower Cretaceous of Australia which are, however, distinguished through a relatively thick granular capsule wall and a smaller number of processes. Hystrichosphaeridium breviatum n. sp. differs from the new species through the very short processes and through the robust approximately 2 microns thick capsule wall.
Measurements: Capsule diameter: 32 microns (28/36 microns), process length:11-14 microns (8/22 microns) (20 measurements). Number of specimens-examined: 34.
Sr. homonym of Hystrichosphaeridium cylindratum Brideaux, 1971.
Holotype: Morgenroth 1966a, Pl. 8, figs. 3,4
Locus typicus: Katharinenhof Fehmarn.
Stratum typicum: Lower Eocene (?2).
Age: Early Eocene
Translation Morgenroth 1966a: GSC
Original diagnosis: Morgenroth 1966a, p.30: Hystrichosphaeridium cylindricatum
A species of the genus Hystrichosphaeridium with a thin-walled capsule which is covered with 20 to 30 strongly cylindrical relatively long thin-walled processes which are distally open, the lips of which are covered with tiny hooklets.
Original description: Morgenroth 1966a, p.30: Hystrichosphaeridium cylindricatum
The spherical, occasionally ellipsoidal capsule is very weakly granular and colorless (the axial ratio of the ellipsoidal capsule can reach a value of 1 to 1.6). From the extremely thin-walled capsule arise 20 to 30 strongly cylindrical hollow processes whose distal opening is generally covered with tiny hooklets. Sometimes, however, the margin of the opening is completely undistorted (regular or smooth). The wall of the processes shows no structure. The development of the processes seems extremely constant, only their length can in some specimens differ by a maximum of 7 microns.
Comparisons: Morgenroth 1966a, p.30
In view of the process type as well as the capsule structure, the new species seems to belong to the "Tubiferen" since it is closely related in the Lower Eocene to Hvstrichosphaeridium tubiferum Ehrenberg. The difference lies in the cyllndrical and slightly longer processes. Forms that are transitional to Hystrichosphaeridium tubiferum have not been found. There is a strong resemblance ln the structure of the processes to Hystrichosphaeridium siphoniphorum Cookson and Eisenack 1958 from the Lower Cretaceous of Australia which are, however, distinguished through a relatively thick granular capsule wall and a smaller number of processes. Hystrichosphaeridium breviatum n. sp. differs from the new species through the very short processes and through the robust approximately 2 microns thick capsule wall.
Measurements: Capsule diameter: 32 microns (28/36 microns), process length:11-14 microns (8/22 microns) (20 measurements). Number of specimens-examined: 34.