From Suzuki Paleotax db:
1887 Sethostylus spiculatus n. sp. Haeckel p. 430
1972 Heliosestilla spicata (Haeckel) Petrushevskaya & Kozlova p. 522, pl. 13, fig. 10
Catalog entries: Sethostylus spicatus
Original description: Disk with spiny surface, four times as broad as the medullary shell. Pores irregular roundish, with many unequal conical spines between them. Margin with an equatorial girdle, composed of three to four concentric series of conical radial spines, about as long as the radius of the medullary shell. Both main spines very large, cylindrical, longer than the diameter of the disk, and as broad as the radius of the medullary shell.
Diameter of the disk 0.2, of the medullary shell 0.05; length of the main spines 0.3 or more, breadth 0.025. [dimensions in mm]
Remarks on original description: There was no illustration of this species in Haeckel (1887)
Haeckel listed Sethostylus spicatus under the subgeneric name Heliostylus, but did not include the subgeneric name in the species name.
Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"
Plot of occurrence data:
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Heliosestilla spicata compiled by the radiolaria@mikrotax project team viewed: 21-6-2025
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