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Two new species of scutelluid trilobites formerly known as Scutellum costatum from Frasnian bioherms in Belgium
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Devonian Proetidae (Trilobita) from the Ardennes Massif (Belgium, N France) and the Eifel Hills (W Germany)
Taxonomy and biostratigraphy of some proetid trilobites in the Middle Devonian of the Ardennes and Eifel (Rhenohercynian Zone)