CATALOG OF ORIGINAL DESCRIPTIONS: Triostephus (Tristephanium) 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 -> T -> Tristephanium
Other pages this level: << < Tripodictya, Tripodiscinus, Tripodiscium, Tripodiscus, Tripodocyrtis, Tripodonium, Tripodosypris, Tripophaenoscenium, Tripospyris, Triprionium, Tripterocalpis, Trisolenia, Trissocircus, Trissocyclus, Trissopilium, Tristephanium, Tristylospyris, Trisulcus, Trizonium, Trochodiscus, Trypanosphaera, Tubosphaera, Tympanidium, Tympaniscus, Tympanium

Tristephanium dimensivum Haeckel 1887

Tristephanium octopyle Haeckel 1887

Tristephanium quadricorne Haeckel 1887


Citation: Triostephus (Tristephanium) Haeckel 1887
Rank: sub-genus
Described on page(s) : 982

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Current identification:

See also: Triostephus - Tristephanium was described as a sub-genus of Triostephus;

Original Description
Coronida with eight large, simple gates of different sizes; the four upper or lateral gates larger than the four lower or basal gates. Skeleton composed of three simple complete rings, perpendicular to one another.

Etymology: Greek tristephanium = small crown with three rings"

Editors' Notes
Although described as a sub-genus by Haeckel, Tristephanium has been used as a genus in the description of the species listed here.

The genus Tristephanium, and the three following genera derived from it, represent together the interesting subfamily of Trissocyclida (Prodromus, 1881, p. 446). These differ from all other Coronida in the possession of three complete rings, perpendicular to one another. The first of these is the vertical sagittal ring, the second the vertical frontal ring, and the third the horizontal basal ring. Since these three rings lie in the three dimensive planes, they are perpendicular to one another; and between them remain eight large open gates. Originally the four upper or lateral gates (corresponding to those of Zygostephanus) are much larger, the four lower or basal gates (corresponding to those of Semantrum) much smaller; but afterwards the latter may reach the size of the former, so that the basal ring becomes equatorial (in Trissocircus and Trissocyclus). The common ancestral form of the Trissocyclida (Tristephanium) may be derived directly either from Semantrum (by complete development of the frontal ring) or from Eucoronis (by complete development of four basal gates).

[Junior objective synonym of Triostephus Haeckel, 1881a]


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


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

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