CATALOG OF ORIGINAL DESCRIPTIONS: Sethophormis octalactis Haeckel 1887

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: rads_cat -> S -> Sethophormis -> Sethophormis octalactis
Other pages this level: S. arachnium, S. asteriscus, S. astrodiscus, S. aurelia, S. cruciata, S. dodecaster, S. enneactis, S. enneastrum, S. eupilium, S. floscula, S. hexagonalis, S. hexalactis, S. leptopilium, S. leptoscenium, S. medusa, S. octalactis, S. pentalactis, S. rotula, S. triloba, S. umbrella

Sethophormis octalactis

Citation: Sethophormis octalactis Haeckel 1887
Rank: species
Type repository: No information given
Described on page(s) : p.1245
Family (traditional): Plagiacanthidae

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Current identification:

Original Description
Cephalis large, hemispherical, with irregular, polygonal pores. Thorax flatly campanulate, with regular, hexagonal pores, and eight stout, regularly-disposed, radial ribs reaching the margin at equal distances. Four of these correspond to the four primary ribs of Tetraphormis cruciata, and exhibit at their base a larger pair of basal pores, surrounded by a semicircular ring (Pl. 70, fig. 5); the other four are secondary, interpolated. Peristome circular, simple.

Cephalis 30µm long, 60µm broad; thorax 100µm long, 20µm broad.

Editors' Notes
There was no illustration of this species in Haeckel (1887)
Haeckel listed Sethophormis octalactis under the subgeneric name Octophormis, but did not include the subgeneric name in the species name.
The species illustrated on pl.70, fig.5 is Sethophormis umbrella Haeckel, 1887a.]


Haeckel, E (1887). Report on the Radiolaria collected by H.M.S. Challenger during the years 1873-1876. Report on the Scientific Results of the Voyage of H.M.S. Challenger during the year 1873-1876, Zoology. 18: 1-1803. gs


Sethophormis octalactis compiled by the radiolaria@mikrotax project team viewed: 19-4-2021

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