From Suzuki Paleotax db:
1973 Thecospharella ptomatus n. sp. Sanfilippo & Riedel p. 521-522, pl. 3, figs. 14-18, pl. 26, fig. 2
1975 Thecosphaerella (?) ptomatus Sanfilippo et Riedel group Petrushevskaya p. 571, pl. 1, figs. 1, 2
1984 Thecosphaerella ptomatus Sanfilippo et Riedel Kozlova pl. 10, fig. 2
1999 Thecosphaerella ptomatus Sanfilippo & Riedel Kozlova p. 80, pl. 8, figs. 4, 5
1999 Thecosphaerella sp. cf. T. ptomatus Sanfilippo et Riedel Kozlova pl. 6, fig. 2; pl. 10, fig. 2
Catalog entries: Thecosphaerella ptomatus
Original description: Cortical shell spherical, generally rather thin-walled, with pores subcircular (very rarely rosette-shaped in late specimens) and variable in size, and with surface thorny and commonly having a few larger thorns with broad bases. Medullary shell thin-walled, double (the inner one commonly attached directly to the outer), the outer one di-rectly attached to the cortical shell and consequently appearing to be flattened on that side. There are few or no bars connecting the outer medullary shell with the cortical shell, but the surface of the former often bears numerous, very delicate spines radiating from its free surface.
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:
Blome, C. D. (1992). Radiolarians from Leg 122, Exmouth and Wombat Plateaus, Indian Ocean C.D. Blome. Proceedings of the Ocean Drilling Program, Scientific Results. 122: 633-652. gs Sanfilippo, A. & Riedel, W. R. (1973). Cenozoic Radiolaria (exclusive of theoperids, artostrobiids and amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling Project Leg 10. Initial Reports of the Deep Sea Drilling Project. 10: 475-608. gs OReferences:
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Thecosphaerella ptomatus compiled by the radiolaria@mikrotax project team viewed: 17-6-2025
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