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.
| not figured | Paratympanum decastylum Haeckel 1887 | |||
| not figured | Paratympanum hexastylum Haeckel 1887 | |||
| Paratympanum octostylum Haeckel 1887 |
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Current identification/main database link:
Original Description
Tympanida with two latticed horizontal rings, connected by numerous descending and diverging columellae; mitral ring smaller than the basal ring.
The genus Paratympanum and the following nearly allied Lithotympanum form together the small subfamily of Paratympanida, distinguished from the other Tympanida by the fenestration of the two parallel horizontal rings. These rings in Lithotympanum are both equal, whilst in Paratympanum the basal ring is larger than the mitral ring; therefore the connecting rods or columellae are in the former parallel and vertical, in the latter divergent and descending. Two opposite ones of these columellae are parts of the primary sagittal ring, two others are parts of the lateral or frontal ring, whilst the remainder are afterwards intercalated. Paratympanum may be derived from Dystympanium by fenestration of the basal ring.
Etymology: From the Greek paratympanum = side-drum"
Editors' Notes
[Junior objective synonym of Paratympanium 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. gsReferences:
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Paratympanum compiled by the radiolaria@mikrotax project team viewed: 20-1-2021
Short stable page link: http://mikrotax.org/radiolaria/index.php?id=253517 Go to Archive.is to create a permanent copy of this page - citation notes |