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Operculodinium erinaceum
Operculodinium erinaceum (Morgenroth, 1966) Stover and Evitt, 1978
Originally Impletosphaeridium, subsequently (and now) Operculodinium.
Holotype: Morgenroth, 1966, pl.8, fig.10
Age: Early Eocene
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Original description: [Morgenroth, 1966a] (translated from German):
Impletosphaeridium erinaceum n. sp.
Plate 8 Fig. 10-12
Nominal derivation: erinaceus Iat.: del' Igel.
Holotype: The specimen preserved in specimen HF 65 and illustrated on Plate 8 Fig. 10.
Paratypoids: HF No. 4, HF No. 18, HF31, HF63.
Typical location: Fehmarn, Katharinenhof.
Typical stratum: Lower Eocene (?2).
Diagnosis: A species of the genus Impletosphaeridium with sturdy, 41-foot-long spines that can occasionally branch. The spines are usually connected by ridge-like thickenings on the capsule wall.
Description: The mostly slightly ellipsoidal capsule has a smooth, rarely finely granulated, surface. From it rise a large number of approximately 41 long, sturdy, massive spines, which may occasionally branch into two or three lateral points. These spiny processes are usually connected by low, ridge-like thickenings of the capsule wall. All specimens have a trapezoidal pyloma located below one pole, which is thus designated as the apical pole.
Comparison: The new species is reminiscent of Hystrichosphaeridium multifureatum DEFLANDRE, but differs from it in its significantly smaller dimensions and the consistently observed ridges connecting the processes.
Dimensions: Capsule length 38μ (33μ/45μ), capsule width 33μ (31μ/36μ), process length: 4μ (3μ/8μ), pyloma Ø 14μ x 20μ (30 measurements). Number of specimens examined: 150.
Originally Impletosphaeridium, subsequently (and now) Operculodinium.
Holotype: Morgenroth, 1966, pl.8, fig.10
Age: Early Eocene
------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Morgenroth, 1966a] (translated from German):
Impletosphaeridium erinaceum n. sp.
Plate 8 Fig. 10-12
Nominal derivation: erinaceus Iat.: del' Igel.
Holotype: The specimen preserved in specimen HF 65 and illustrated on Plate 8 Fig. 10.
Paratypoids: HF No. 4, HF No. 18, HF31, HF63.
Typical location: Fehmarn, Katharinenhof.
Typical stratum: Lower Eocene (?2).
Diagnosis: A species of the genus Impletosphaeridium with sturdy, 41-foot-long spines that can occasionally branch. The spines are usually connected by ridge-like thickenings on the capsule wall.
Description: The mostly slightly ellipsoidal capsule has a smooth, rarely finely granulated, surface. From it rise a large number of approximately 41 long, sturdy, massive spines, which may occasionally branch into two or three lateral points. These spiny processes are usually connected by low, ridge-like thickenings of the capsule wall. All specimens have a trapezoidal pyloma located below one pole, which is thus designated as the apical pole.
Comparison: The new species is reminiscent of Hystrichosphaeridium multifureatum DEFLANDRE, but differs from it in its significantly smaller dimensions and the consistently observed ridges connecting the processes.
Dimensions: Capsule length 38μ (33μ/45μ), capsule width 33μ (31μ/36μ), process length: 4μ (3μ/8μ), pyloma Ø 14μ x 20μ (30 measurements). Number of specimens examined: 150.