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Prediscosphaera
Mesozoic taxa
Prediscosphaera
Edited by Paul Bown on Tue, 20/03/2012 - 00:39
Citation:
Prediscosphaera Vekshina, 1959
Diagnosis:
Elliptical to circular placoliths with central area spanned by cross-bars which support tall, complexely-constructed spines. The distal shield is typically bicyclic, with a broad outer-cycle, generally constructed from 16 non-imbricating elements (V-units) and a narrow inner-cycle (tube cycle) (R-units). The proximal shield is formed from R-units. The LM image is bicyclic, with the outer cycle dark and inner cycle bright.
Type species: Prediscosphaera cretacea (Arkhangelsky, 1912) Gartner, 1968.
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Mesozoic: Prediscosphaera
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