The Ordovician Aglaspidid Arthropod 'Tremaglaspis' Reconsidered

Abstract

The discovery of five additional topotype specimens of the Tremadoc (early Ordovician) aglaspidid Tremaglaspis unite adds considerably to the known material of this species. Some morphological details can now be corrected, notably in the opisthosomal segments, which number ten, not eleven (typical of Aglaspis itself), as formerly suggested. Other details are confirmed and a new reconstruction is offered.