Standards have been empirically developed to describe various morphological characters of eurypterids. The standards pertain to the following characters: 1) shape of the prosoma; 2) shape of the ...
The new Class Coronoidea is proposed to include five genera of Ordovician-Silurian blastozoan echinoderms--Stephanocrinus, Mespilocystites, Paracystis, Stephanoblastus and Tormoblastus--formerly ...
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