Abstract
Vertebrate fossils of the lower Middle Devonian Muhlenberg Formation from the western Bergisches Land (eastern Rhenish Massif) are described. The placoderms are represented by disarticulated plates of coccosteid arthrodires and the acanthodians by several ischnacanthid jaw bones and aMachaeracanthus finspine. The arthrodires are assigned to a new species; a new genus has to be erected if remains of trunk and head shield remains are conspecific.
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