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.
| Zonarium octangulum Haeckel 1887 | |||
| not figured | Zonarium quadrigatum Haeckel 1887 | |||
| not figured | Zonarium quadrispinum Haeckel 1887 | |||
| not figured | Zonarium tetratholium Haeckel 1887 |
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Current identification:
Original Description
Zonarida with four dome-shaped chambers of the cortical shell, separated by two annular constrictions (one sagittal and one transverse).
The genus Zonarium is the most simple form of the Zonarida, and differs from the nearly allied Larnacalpis by two ring-like constrictions, which are crossed at right angles, one in the sagittal (or median) plane, and one in the transverse (or equatorial) plane. By these two annular constrictions four egg-shaped or kidney-shaped chambers become imperfectly separated, which correspond to the quadrants of the lateral plane. The first cause of the marked constrictions may be the formation of the latticed sagittal septum, which is found first in Octopyle, as halving the four gates of Tetrapyle. Between this septum and the constricted narrow transverse girdle the cortical shell grows out in the form of four vaulted cupolas; every two opposite domes are congruent, two neighbouring are symmetrically equal.
Etymology: Greek zonarium = small girdle"
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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Zonarium compiled by the radiolaria@mikrotax project team viewed: 18-5-2021
Short stable page link: https://mikrotax.org/radiolaria/index.php?id=263221 Go to Archive.is to create a permanent copy of this page - citation notes |