Original material of vertebrates from two Lower Devonian localities of the Belgian Ardenne Massif is described. The material from La Gileppe includes Rhinopteraspis crouchi (Vertebrata, Heterostraci, Pteraspidiformes) and is the first confirmation of vertebrate for this late Lochkovian locality belonging to the Z Spore Zone, and correlated to the lower part of the Althaspis leachi Fish Zone. This confirms the overlapping range of R. crouchi and A. leachi in the siliciclastic Lower Devonian of Western Europe. An orbital plate and two other elements of an undetermined pteraspidiform from Nonceveux are added to the material already known from this locality. The Nonceveux locality is late Lochkovian in age and belongs to the G Spore Zone, which is correlated to the base of the A. leachi Fish Zone. The La Gileppe material is composed of small specimens which are interpreted as either of juvenile individuals or of small adults. It is consistent with previous results on French-Belgian localities among the Early Devonian siliciclastic deposits of Western Europe (Old Red Sandstones and allied facies) which have been interpreted as confined, restricted marine environments.