CATALOG OF ORIGINAL DESCRIPTIONS: Sethophormis umbrella 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 umbrella
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 umbrella

Citation: Sethophormis umbrella Haeckel 1887
Rank: species
Type specimens: pl.70, figs.4,5
Type repository: No information given
Described on page(s) : p.1248
Family (traditional): Plagiacanthidae
Family (modern): Theophormidae

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Current identification:

Original Description
Cephalis large, flatly cap-shaped, with irregular, small polygonal meshes. Thorax flat, umbrella-shaped, with subregular, hexagonal meshes, and sixteen strong radial ribs. Four of these are perradial, and centrifugal prolongations of the four crossed collar beams; four others are interradial, and arise, alternating with the former, directly from the horizontal collar ring; eight ribs are adradial or tertiary, and arise in pairs from the four large perradial basal arches of the thorax, which become bisected by the four primary ribs. Peristome irregularly denticulate.

Cephalis 0.02 long, 0.06 broad; thorax 0.12 long, 0.32 broad.

Editors' Notes
Haeckel listed Sethophormis umbrella under the subgeneric name Astrophormis, but did not include the subgeneric name in the species name.


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

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