On the first Belgian record of the Eifelian (Middle Devonian) ammonoid cephalopod Subanarcestes (Suborder Anarcestina)

Ammonoid cephalopods are extremely rare in the Lower and Middle Devonian sedimentary rocks of Belgium, which contrasts with neighboring basins. However, searches old collections recent collecting efforts show that ammonoids do occur these beds allows to enlarge our knowledge ammonoid occurrences. Here, a record Eifelian (Middle Devonian) anarcestid genus Subanarcestes is described for first time from Belgium based on specimen Jemelle Formation (Chavées Member). This was collected more than century ago by Eugène Maillieux at Trou Bodet near Couvin. It laid unrecognized as an cephalopod many decades Royal Belgian Institute Natural Sciences, while being previously identified Cryptoceras or ‘Nautilus’ fossil, if correct, constituted Belgium’s oldest Nautilida fossil. Micro-CT imaging greatly helped taxonomic assignment specimen.