Les plus anciens Vertébrés du Grand-Duché de Luxembourg : des Arthrodires Brachythoraci (Piacodermi ; Dévonien inférieur)

Two dermal plates of the thoracic shield of brachythoracid arthrodires have been discovered in Emsian localities of the Grand-Duchy of Luxembourg (GDL). They represent the first confirmed discovery of vertebrates in the Lower Devonian of the GDL, and thus become the oldest vertebrates of this country. They are also interesting by the fact that the occurrence of Brachythoraci in the Devonian of the Ardenne Allochthon has been, until now, very rare. The features of one of both plates fit rather well with the shape of the homologous plate of the Coccosteidae; this family is usually unreported in... Mehr ...