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

Tympanidium barbadense Haeckel 1887

Tympanidium binoctonum Haeckel 1887

Tympanidium foliosum Haeckel 1887
= Tympanidium foliosum
not figuredTympanidium spinosum Haeckel 1887

not figuredTympanidium staurocircum Haeckel 1887


Citation: Tympanidium Haeckel 1887
Rank: genus
Described on page(s) : 1003
Family (traditional): Trissocyclidae

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Current identification/main database link: Tympanidium Haeckel 1887

Original Description
Tympanida with two bisected horizontal rings, which are connected by four vertical meridional rings (or eight columellae).

The genus Tympanidium differs from all other Protympanida in the development of four vertical rings, placed in four different meridional planes. Only one of these is complete, the primary sagittal ring; the three others are incomplete, inserted on the two horizontal rings, which are formed by the paired mitral and basal branches of the sagittal ring; one of these three lies in the frontal plane, the two others in diagonal meridional planes (between the frontal and sagittal). The shell therefore exhibits twelve large gates, four of which are horizontal (the two superior. mitral and the two inferior basal gates) ; the eight others are vertical, separated by the eight columellae, or the halves of the four meridional rings. In the subgenus Tympanomma the number of gates amounts to sixteen, the four lateral gates being bisected by an incomplete equatorial ring. The genus Tympanidium may be derived from Acrocubus by development of the two diagonal rings (between the frontal and sagittal).

Etymology: Greek tympanidium = small drum"

Extra details from original publication

Sub-genera described:

Editors' Notes
Junior objective synonym of Tympanium 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


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

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