Structure of the first-formed shell of the Middle Ordovician orthid-like brachiopods from the Leningrad Region |
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Authors: | A A Madison |
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Institution: | 1.Borissiak Paleontological Institute,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Shell structure of the first-formed shell of the Middle Ordovician orthid-like brachiopods from the Leningrad Region is described.
The 190-μm-wide first-formed shell is composed of finely granular layer while 700-μm-wide first-formed shell is fibrous. Thus
the order Orthida in the Early Paleozoic included brachiopods with both planktotrophic and lecithotrophic larvae in the ontogeny. |
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