radiolaria - rads_cenozoic - Sethophormis aurelia

Sethophormis aurelia

Classification: rads_cenozoic -> Plagiacanthidae -> Sethophormididae -> Sethophormis -> Sethophormis aurelia
Sister taxa: S. aurelia, S. sp.


Citation: Sethophormis aurelia Haeckel 1887
Rank: species
Basionym: Sethophormis aurelia

Catalog entries: Sethophormis aurelia

Original description: Cephalis large, nearly hemispherical, with irregular, delicate network of small square meshes. Collar-septum with four large meshes, separated by a cross od four bars, opposite in pairs. Thorax flatly campanulate, with delicate, subregular, hexagonal meshes, and twenty-four prominent radial ribs; four of these are primary or perradial (centrifugal prolongations of the four bars of the collar-septum); four others are interradial or secondary, alternating with the former at angles of 45°; sixteen others are adradial or tertiary, interpolated between the first and second more or less irregularly. In some specimens the disposition of the twenty- four ribs was more regular, in others more irregular, than in the specimen figured (figs. 3, 4). The central capsule (fig. 4) exhibits a flat, cap-shaped part with the nucleus (enclosed in the cephalis), and four large, pear-shaped lobes protruded through the four large collar holes (somewhat deformed in the preparation figured). The wall of the thorax exhibits at the base four larger, nearly semi-circular pores, bisected by the four primary thoracic ribs. Peristome withtwenty-four indentations (between the prominent distal ends of the twenty-four ribs), often more distinct than in the specimen figured.

Cephalis 30µm long, 80µm broad; thorax 100µm to 200µm long, 400µm to 600µm broad.
Remarks on original description: Haeckel listed Sethophormis aurelia under the subgeneric name Astrophormis, but did not include the subgeneric name in the species name.
Stratigraphic information for LM21 from Riedel, 1959, p.287]




Biogeography and Palaeobiology

Similar species

Geographic distribution


Phylogenetic relations

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group"
First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"

Plot of occurrence data:



Sethophormis aurelia compiled by the radiolaria@mikrotax project team viewed: 2-12-2022

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