Abstract
Heterostraci; Osteostraci and Thelodonti are known from the Lower Devonian of the Ardenne Allochthonous unit of the Palaeozoic orogen encountered between the Strait of Dover and the Rhine river; in northern France and southern Belgium. Heterostracans have been used to define six interval biozones from the lowermost Devonian up to the Emsian. Osteostracans are rare. Thelodonts correlate with other Lower Devonian sequences of the southern margin of the Old Red Continent. Placoderms are known from the Lochkovian (lower Lower Devonian) up to the Famennian (upper Upper Devonian); from both the Ardenne Allochthonous and the Brabant Parautochthonous units of the orogen. They are represented mainly by endemic species. The richest placoderm fauna is upper Famennian in age. No Eifelian record has been confirmed.
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