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Cyclonephelium reticulosum
From Fensome et al., 2019:
Cyclonephelium reticulosum Gerlach, 1961, p.204, pl.29, fig.2. Holotype: Gerlach, 1961, pl.29, fig.2. NOW Glaphyrocysta. Originally Cyclonephelium, subsequently Glaphyrocysta?, thirdly (and now) Glaphyrocysta. Age: middle–Late Oligocene.
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Original description Gerlach, 1961 [as Cyclonephelium reticulosum]:
Holotype: Pr 1170/67 (674), Plate 29, Fig. 2.
Paratypes: Pr 1170/68 (677) and Pr 1170/69 (670).
Locus typicus: WEll Emsburen 7.
Stratum typicum: Upper Oligocene
Derivation of name: reticulum = net, in reference to the net-like membranous adhesions of the processes.
Diagnosis:
Typical species of the genus Cyclonephelium with slender, massive processes that fork into several branches or are connected by finely membranous, net-like intergrowths. Appendages fused basally on the capsule surface. Membrane finely reticulated.
Description:
The originally probably spheroidal to ellipsoidal carapaces appear wider in outline than they are tall due to the apical archeopyle being raised, as has been observed in other forms. The outline of the archeopyle is sometimes jagged. On both sides of the antapex, the theca often appears to be bulged like a stool. The arrangement of the processes is predominantly marginal in a meridian direction, while only a few appendages can be observed dorsoventrally. At the base, the processes are often fused longitudinally. These basal connecting ridges can be observed not far from the right and left lateral edges of the theca, both dorsally and ventrally, thus creating two marginal, parallel groups of processes. The length of the processes corresponds to approximately two-thirds of the capsule diameter. The appendages are slender and massive, forked into several fine branches in the upper third and connected distally by thread-like strands, or connected by finely membranous, net-like perforated seams.
The delicate-walled membrane of the sheaths exhibits a fine reticulation consisting of tiny, irregularly polygonal to round meshes. The color of the membrane is light yellow. Despite the delicate wall of the carapaces and the net-like interwoven strands, the preservation of the forms is excellent.
In the core samples examined, the occurrence of this species is limited to the Oligocene. Whether these are leading forms must be determined by further investigations.
Dimensions:
Holotype: 84(53):115(39), 35
Paratype: 84(42):102(51), 32; 74(51):94(51), 21
Maximum: 84(53):115(59), 35
Minimum: 68(52):103(59), 32
Average: 77(51):100(55), 31
Cyclonephelium reticulosum Gerlach, 1961, p.204, pl.29, fig.2. Holotype: Gerlach, 1961, pl.29, fig.2. NOW Glaphyrocysta. Originally Cyclonephelium, subsequently Glaphyrocysta?, thirdly (and now) Glaphyrocysta. Age: middle–Late Oligocene.
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Original description Gerlach, 1961 [as Cyclonephelium reticulosum]:
Holotype: Pr 1170/67 (674), Plate 29, Fig. 2.
Paratypes: Pr 1170/68 (677) and Pr 1170/69 (670).
Locus typicus: WEll Emsburen 7.
Stratum typicum: Upper Oligocene
Derivation of name: reticulum = net, in reference to the net-like membranous adhesions of the processes.
Diagnosis:
Typical species of the genus Cyclonephelium with slender, massive processes that fork into several branches or are connected by finely membranous, net-like intergrowths. Appendages fused basally on the capsule surface. Membrane finely reticulated.
Description:
The originally probably spheroidal to ellipsoidal carapaces appear wider in outline than they are tall due to the apical archeopyle being raised, as has been observed in other forms. The outline of the archeopyle is sometimes jagged. On both sides of the antapex, the theca often appears to be bulged like a stool. The arrangement of the processes is predominantly marginal in a meridian direction, while only a few appendages can be observed dorsoventrally. At the base, the processes are often fused longitudinally. These basal connecting ridges can be observed not far from the right and left lateral edges of the theca, both dorsally and ventrally, thus creating two marginal, parallel groups of processes. The length of the processes corresponds to approximately two-thirds of the capsule diameter. The appendages are slender and massive, forked into several fine branches in the upper third and connected distally by thread-like strands, or connected by finely membranous, net-like perforated seams.
The delicate-walled membrane of the sheaths exhibits a fine reticulation consisting of tiny, irregularly polygonal to round meshes. The color of the membrane is light yellow. Despite the delicate wall of the carapaces and the net-like interwoven strands, the preservation of the forms is excellent.
In the core samples examined, the occurrence of this species is limited to the Oligocene. Whether these are leading forms must be determined by further investigations.
Dimensions:
Holotype: 84(53):115(39), 35
Paratype: 84(42):102(51), 32; 74(51):94(51), 21
Maximum: 84(53):115(59), 35
Minimum: 68(52):103(59), 32
Average: 77(51):100(55), 31