The type species of Calymene (Trilobita) from the Silurian of Dudley, England

The type material of Calymene blumenbachii Brongniart in Desmarest 1817 (type species of Calymene Brongniart, 1822) and C. tuberculata (Brunnich, 1781) has been revised, with that of the latter being figured for the first time. The nomen dubium status accorded to C. tuberculata by Shirley (1933) can no longer be upheld as the syntype specimens of Silurian age are, on preparation, very well preserved and identifiable, though this species is now recognized as a senior (subjective) synonym of C. blumenbachii. In consequence application is being made to the International Commission on Zoological Nomenclature to retain the junior name in the interest of stability.