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Adnatosphaeridium reticulense
Adnatosphaeridium reticulense, (Pastiels, 1948), De Coninck, 1969
Now Nematosphaeropsis. Originally Cannosphaeropsis, subsequently Adnatosphaeridium, thirdly (and now) Nematosphaeropsis.
Holotype: unrecognizable, according to Sarjeant, 1986.
Lectotype: Pastiels, 1948, pl.5, fig.10; designated by Sarjeant, 1986.
Age: Early Eocene
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Original description: [Gocht, 1969, p. 64] (Translation: Geological Survey of Canada):
Description:
This species is dispersed in a number of samples from the Early Eocene. The main body is globose, often more or less flattened, and has a six-jagged apical pylome seen on a number of well preserved specimens. These findings are not consistent with the data of Williams and Downie, who noted precingular openings on finds from the London Clay and confirmed the determination of Cannosphaeropsis. Both these finds and those of Morgenroth, 1966 seem to be more finely reticulate than Pastiels" and the material from Meckelfeld. Only comparison with the Belgian originals can resolve which forms actually represent the species. The arrangement of processes on the main body is highly variable, and this fact could favor classification under Adnatosphaeridium. However, the ventral precingular fields usually have only one process each, while the dorsals have more than one. The precingular processes form a series just below the archeopyle margin, all standing at about the same level. Below this, in the middle of the dorsal side, there are sometimes large concentrations of processes, which may be arranged in arcs open toward the apex.
Now Nematosphaeropsis. Originally Cannosphaeropsis, subsequently Adnatosphaeridium, thirdly (and now) Nematosphaeropsis.
Holotype: unrecognizable, according to Sarjeant, 1986.
Lectotype: Pastiels, 1948, pl.5, fig.10; designated by Sarjeant, 1986.
Age: Early Eocene
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Original description: [Gocht, 1969, p. 64] (Translation: Geological Survey of Canada):
Description:
This species is dispersed in a number of samples from the Early Eocene. The main body is globose, often more or less flattened, and has a six-jagged apical pylome seen on a number of well preserved specimens. These findings are not consistent with the data of Williams and Downie, who noted precingular openings on finds from the London Clay and confirmed the determination of Cannosphaeropsis. Both these finds and those of Morgenroth, 1966 seem to be more finely reticulate than Pastiels" and the material from Meckelfeld. Only comparison with the Belgian originals can resolve which forms actually represent the species. The arrangement of processes on the main body is highly variable, and this fact could favor classification under Adnatosphaeridium. However, the ventral precingular fields usually have only one process each, while the dorsals have more than one. The precingular processes form a series just below the archeopyle margin, all standing at about the same level. Below this, in the middle of the dorsal side, there are sometimes large concentrations of processes, which may be arranged in arcs open toward the apex.