Catalog entries: Stylosphaera goruna
Original description: Cortical shell ellipsoidal, of variable wall thickness, with pores subcircular or occasionally rosette-shaped, of irregular size and arrangement (distance between centers approximately 9-l7.5 µ. From the surface of the cortical shell arise several strong, bladed spines -commonly a long one at or near each pole (its length approaching that of the cortical shell) and 1-3 shorter ones scattered over each half-ellipsoid. Medullary shell single, delicate, pyriform, with its axis not aligned with the longer spines (and therefore commonly appearing ro be circular in outline). Cortical and medullary shells joined by six or more radial bars, some of which are collinear with some of the external spines. In the older assemblages examined, many specimens have no medullary shells nor internal bars.
Remarks on original description: Synonymized with Amphisphaera spinulosa (Ehrenberg) group by Petrushevskaya, 1975c, p.570[comment from RadWorld database]
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"
Plot of occurrence data:
Amphisphaera goruna compiled by the radiolaria@mikrotax project team viewed: 27-1-2023
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