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 -> Trizonium
Other pages this level: << < Tripodiscus, Tripodocyrtis, Tripodonium, Tripodosypris, Tripophaenoscenium, Tripospyris, Triprionium, Tripterocalpis, Trisolenia, Trissocircus, Trissocyclus, Trissopilium, Tristephanium, Tristylospyris, Trisulcus, Trizonium, Trochodiscus, Trypanosphaera, Tubosphaera, Tympanidium, Tympaniscus, Tympanium

not figuredTrizonium amphibelonium Haeckel 1887

not figuredTrizonium constrictum Haeckel 1887

not figuredTrizonium decabelonium Haeckel 1887

not figuredTrizonium dodecabelos Haeckel 1887

not figuredTrizonium hexabelonium Haeckel 1887

not figuredTrizonium hexagonium Haeckel 1887

not figuredTrizonium octobelonium Haeckel 1887

not figuredTrizonium octogonium Haeckel 1887

not figuredTrizonium pleurobelonium Haeckel 1887

not figuredTrizonium staurobelonium Haeckel 1887

Trizonium tricinctum Haeckel 1887


Citation: Trizonium Haeckel 1887
Rank: genus
Type species: Trizonium tricinctum Haeckel 1887 [designated by Chediya,1959, p.154]
Described on page(s) : 637
Family (traditional): not-known

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Current identification:

Original Description
Pylonida with simple, spherical or subspherical, central chamber, surrounded by three latticed girdles, one smaller (primary) transverse, one larger (secondary) lateral, and one (tertiary) sagittal girdle.

Etymology: From the Greek trizonium = with three girdles"

Extra details from original publication
The genus Trizonium represents the most highly developed form of the Haplozonaria, with three complete elliptical latticed girdles, crossed at right angles and lying in the perimeter of the three dimensive planes. Commonly the first (transverse) girdle is the smallest, immediately connected with the spherical or lentelliptical central chamber. The minor axis of the second (lateral) girdle is identical with the major axis of the first girdle. The third (sagittal) girdle is either larger than both others, or intermediate between them. If the four gates between the girdles become afterwards closed by lattice-work, the ""trizonal shell"" of Trizonium passes over into the typical Larnacilla, the ancestral form of a great many Larcoidea.
Sub-genera described:


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


Trizonium compiled by the radiolaria@mikrotax project team viewed: 15-4-2021

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