CATALOG OF ORIGINAL DESCRIPTIONS: Sethophormis hexalactis 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 hexalactis
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 hexalactis

Citation: Sethophormis hexalactis Haeckel 1887
Rank: species
Type locality: LM31
Type age (chronostrat): [presumably Quaternary though some forms reported from this station appear to be Tertiary]
Type specimens: pl.56, fig.6
Type repository: No information given
Described on page(s) : p.1245

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Current identification:

Original Description
Cephalis large, hemispherical, with irregular, polygonal pores. Thorax flatly campanulate, with subregular, hexagonal pores, and six stout radial ribs; the lateral connected in pairs. (Fig. 6 exhibits the central part of the shell, seen from below.) In the subcircular collar septum the two anterior (jugular) meshes are much smallcr than the two posterior (cardinal) meshes. The odd anterior (sternal) rib is opposite to the posterior (caudal) rib. The two paired ribs of each side (antero-lateral or pectoral and postero-lateral or ventral ribs) diverge from one common point. In the specimen figured the left half of the thorax exhibited the two regular ribs, and the right half three, a posterior accessory branch being developed (transition to Octophormis). This specimen might indeed be called Heptaphormis heptalactis.

Size: Cephalis 0.02 long, 0.05 broad; thorax 0.08 long, 0.22 broad.

Editors' Notes
See Sethophormis heptalactis.

Haeckel listed Sethophormis hexalactis under the subgeneric name Hexaphormis, but did not include the subgeneric name in the species name.

Because Haeckel indicates above that the illustration (pl.56, fig.6) is more appropriately called Heptaphormis heptalactis =[Sethophormis heptalactis], we include it to illustrate that species rather than S. hexalactis.[comment from RadWorld database]


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

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