radiolaria - rads_cat - Zonidium


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 -> Z -> Zonidium
Other pages this level: Zealithapium, Zonarium, Zonidium, Zoniscus, Zonodiscus, Zygacantha, Zygartus, Zygocampe, Zygocircus, Zygospyris, Zygostephaniscus, Zygostephanium, Zygostephanus

not figuredZonidium octostylium Haeckel 1887

Zonidium octotholium Haeckel 1887


Citation: Zonidium Haeckel 1887
Rank: genus
Type species: Zonarium quadrigatum Haeckel 1887 [designated by Campbell,1954, p.D98]
Described on page(s) : 687
Family (traditional): Pyloniidae

Current identification:

Original Description

Zonarida with eight dome-shaped chambers of the cortical shell, separated by four annular constrictions (one sagittal, one transverse, and two others parallel to the latter).

The genus Zonidium must be regarded as a Zonarium, in which the four cupolas (in the quadrants of the lateral plane) are halved by diagonal beams or latticed septa, lying opposite in pairs in two crossed diagonal planes. Therefore the number of the septa (four) and the domes (eight) is here doubled. Among the eight cupolas we distinguish four median (on both sides of the sagittal plane) and four lateral (on both sides of the equatorial plane); both groups are of different size and form. Probably Zonidium is derived from Zonarium by lattice-connection between the eight diagonal wing-spines, which in both species of this genus are present, the same as in Tetrapyle octacantha.



Greek zonidium = little girdle"

Extra details from original publication

Editors' Notes


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 years 1873-1876. 18: 1-1803. gs


Zonidium compiled by the radiolaria@mikrotax project team viewed: 24-5-2022

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