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Current identification:
Original Description
Tympanida with two bisected horizontal rings, which are connected by three vertical meridional rings (or six columelae).
The genus Tympaniscus and the following Tympanidium differ from all preceding Tympanida in the multiplication of the vertical columellae, which connect the two horizontal bisected rings. Tympaniscus exhibits six columellae, which may be regarded as halves of three meridional rings. Only one, however, of these is complete (the sagittal ring, which bisects the mitral and the basal ring); the two other meridional rings, (placed in diagonal planes) may be regarded as produced by lateral bifurcation of an incomplete frontal ring; this appears to be already foreshadowed in the preceding Octotympanum.
Etymology: Greek tympaniscus = little drum"
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. gsReferences:
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Tympaniscus compiled by the radiolaria@mikrotax project team viewed: 19-4-2021
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