A psammosteid heterostracan (vertebrata: Pteraspidomorphi) from the Emsian (lower Devonian) of the grand duchy of Luxembourg

A fragment of a ventral disc of the head carapace of Drepanaspis sp. is reported for the first time from the Schuttbourg Formation of the Grand Duchy of Luxembourg. This formation is classically attributed to the upper lower Emsian (E1b). However, the fossil content of the locality (Merkholtz South-East quarry), including miospores, macroplants, bivalves, pterygotids, ostracodes and vertebrates, indicates a middle-upper Emsian age. This age is traditionally attributed to the overlying Clervaux Formation (Klerf-Schichten) of Luxembourg and western Germany (E2). This Drepanaspis record is the fi... Mehr ...