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Lanternosphaeridium bipolare
Lanternosphaeridium bipolare (Cookson and Eisenack, 1965) De Coninck, 1969
Now Fibrocysta. Originally Cordosphaeridium subsequently Lanternosphaeridium, thirdly Amphorosphaeridium, fourthly (and now) Fibrocysta.
Davey, 1969, transferred this species to Amphorosphaeridium Davey, 1969. Lentin and Williams, 1977, retained it in Lanternosphaeridium.
The transfer of this species to Lanternosphaeridium by Gocht, 1969, was not validly published, since he did not fully reference the basionym.
Holotype: Cookson and Eisenack, 1965, pl.16, fig.8
Paratype: Cookson and Eisenack, 1965
Locus typicus: North bank of the Glenelg River, SE corner of Drajurk, 9 miles SW of Casterton, SW Victoria, Australia
Stratum typicum: Early Eocene
Translation Gocht, 1969: Geological Survey of Canada
Original description: Cookson and Eisenack, 1965, p.135: Cordosphaeridium bipolare
Shell typically oval, well-covered with narrow, solid, unbranched appendages of varying length, and width. Usually the appendages narrow somewhat from broadish bases to widen distally to shallow funnel-shaped apices, the recurved edges of which may bear minute hair-like branches. In the larger appendages fine, longitudinal fibrils may be seen. The shell is bipolar, being characterized by the development of a distinctive apical and antapical appendage. The apical appendage is relatively short and broad, solid, densely granular and with a bluntish tip. It may be simple or with one or two short, slender, lateral branches. In the type specimen ([Cookson and Eisenack, 1965] Pl. 16, fig. 8) it appears to be connected with three broad, flattened, longitudinally striated appendages. The antapical appendage is longer than the neighbouring ones, unstriated, unbranched with approximately straight sides and a pointed tip.
The surface of the shell is densely granular with a linear arrangement evident near the bases of the appendages. A large archeopyle extends from close to the apical pole to the equatorial region of one surface.
Size: Holotype: overall length 128 Ám, overall width 90 Ám, central body 80 x 62 Ám, length of apical appendage 17 Ám, length of antapical appendage 29 Ám. Range: overall length 124-128 Ám, overall width 88-98 Ám, central body 80-90 x 57-70 Ám, length of apical appendage 12-17 Ám, length of antapical appendage 20-33 Ám.
Gocht, 1969, p.49:
Lanternosphaeridium cf. bipolare (Cookson and Eisenack, 1965)
Very common, but evidently also highly variable in the Early Eocene strata at Meckelfeld, this form is characterized by a spherical to ovoid body with a strong, sometimes distinctly thick wall and solid processes of varying thickness.
The archeopyle is relatively large, and reminiscent of that of C. inodes. At the cingular level there are mostly thin cingular processes numbering up to twelve. The polar processes are frequently highly branched, and exceed the cingulars in length and girth. The archeopyle plate bears 3-4 processes. The cingular appendages have relatively slender shafts with a round to flattened cross section, and are subdivided to different degrees distally. In the ventral region, we again find groups of fine, hairlike appendages. In contrast to the species description by Cookson and Eisenack, 1965, it should be noted that the Meckelfeld form is often globose (i.e., the main body), and hardly differs, apart from the
polarity and the number of processes, from C. inodes, with which it also occurs.
Measurements: Maximal extension: 123-150 Ám; main body diameter 59-80 Ám, process length 21-40 Ám.
Occurrence: Early Eocene.
Now Fibrocysta. Originally Cordosphaeridium subsequently Lanternosphaeridium, thirdly Amphorosphaeridium, fourthly (and now) Fibrocysta.
Davey, 1969, transferred this species to Amphorosphaeridium Davey, 1969. Lentin and Williams, 1977, retained it in Lanternosphaeridium.
The transfer of this species to Lanternosphaeridium by Gocht, 1969, was not validly published, since he did not fully reference the basionym.
Holotype: Cookson and Eisenack, 1965, pl.16, fig.8
Paratype: Cookson and Eisenack, 1965
Locus typicus: North bank of the Glenelg River, SE corner of Drajurk, 9 miles SW of Casterton, SW Victoria, Australia
Stratum typicum: Early Eocene
Translation Gocht, 1969: Geological Survey of Canada
Original description: Cookson and Eisenack, 1965, p.135: Cordosphaeridium bipolare
Shell typically oval, well-covered with narrow, solid, unbranched appendages of varying length, and width. Usually the appendages narrow somewhat from broadish bases to widen distally to shallow funnel-shaped apices, the recurved edges of which may bear minute hair-like branches. In the larger appendages fine, longitudinal fibrils may be seen. The shell is bipolar, being characterized by the development of a distinctive apical and antapical appendage. The apical appendage is relatively short and broad, solid, densely granular and with a bluntish tip. It may be simple or with one or two short, slender, lateral branches. In the type specimen ([Cookson and Eisenack, 1965] Pl. 16, fig. 8) it appears to be connected with three broad, flattened, longitudinally striated appendages. The antapical appendage is longer than the neighbouring ones, unstriated, unbranched with approximately straight sides and a pointed tip.
The surface of the shell is densely granular with a linear arrangement evident near the bases of the appendages. A large archeopyle extends from close to the apical pole to the equatorial region of one surface.
Size: Holotype: overall length 128 Ám, overall width 90 Ám, central body 80 x 62 Ám, length of apical appendage 17 Ám, length of antapical appendage 29 Ám. Range: overall length 124-128 Ám, overall width 88-98 Ám, central body 80-90 x 57-70 Ám, length of apical appendage 12-17 Ám, length of antapical appendage 20-33 Ám.
Gocht, 1969, p.49:
Lanternosphaeridium cf. bipolare (Cookson and Eisenack, 1965)
Very common, but evidently also highly variable in the Early Eocene strata at Meckelfeld, this form is characterized by a spherical to ovoid body with a strong, sometimes distinctly thick wall and solid processes of varying thickness.
The archeopyle is relatively large, and reminiscent of that of C. inodes. At the cingular level there are mostly thin cingular processes numbering up to twelve. The polar processes are frequently highly branched, and exceed the cingulars in length and girth. The archeopyle plate bears 3-4 processes. The cingular appendages have relatively slender shafts with a round to flattened cross section, and are subdivided to different degrees distally. In the ventral region, we again find groups of fine, hairlike appendages. In contrast to the species description by Cookson and Eisenack, 1965, it should be noted that the Meckelfeld form is often globose (i.e., the main body), and hardly differs, apart from the
polarity and the number of processes, from C. inodes, with which it also occurs.
Measurements: Maximal extension: 123-150 Ám; main body diameter 59-80 Ám, process length 21-40 Ám.
Occurrence: Early Eocene.