Tympanidium


Classification: rads_cenozoic -> Trissocyclidae -> Trissocyclidae inc sed -> Tympanidium
Sister taxa: Acrocubus, Cantharospyris, Cephalospyris, Dendrospyris, Dictyospyris, Lithotympanum, Nephrospyris, Paradictyum, Phormospyris, Tympanidium, Zygospyris
Daughter taxa: (blue => in age window 0-800Ma)
Tympanidium foliosum

neptune records:
Tympanidium sp.

neptune records:

Taxonomy

Citation: Tympanidium Haeckel 1887
Rank: genus
Basionym: Tympanidium

Catalog entries: Tympanidium

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).
Remarks on original description: Junior objective synonym of Tympanium Haeckel, 1881a

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of Piacenzian Stage (100% up, 2.6Ma, in Piacenzian stage). Data source: Total of range of species in this database
First occurrence (base): at base of Aquitanian Stage (0% up, 23Ma, in Aquitanian stage). Data source: Total of range of species in this database

Plot of occurrence data:

References:

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


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Tympanidium compiled by the radiolaria@mikrotax project team viewed: 22-10-2020

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Short stable page link: http://mikrotax.org/radiolaria/index.php?id=205980 Go to Archive.is to create a permanent copy of this page - citation notes



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