A new trigonotarbid arachnid from the Coal Measures of Hagen-Vorhalle, Germany

A new trigonotarbid (Arachnida: Trigonotarbida: Trigonotarbidae) is described as Archaeomartus roessleri n. sp. from the Upper Carboniferous (Pennsylvanian; Namurian B, higher Marsdenian) of Hagen-Vorhalle, Germany. Originally assigned to Trigonotarbus johnsoni Pocock, 1911, our new fossil has a distinctly lobed carapace and thus resembles more closely the Early Devonian species Archaeomartus levis Størmer, 1970. In carapace morphology Archaeomartus approaches the condition seen in the larger and more heavily-armoured taxa Eophrynidae, Kreischeriidae and Aphantomartidae. Thus we provisionally resolve Archaeomartus as sister-group to this probably monophyletic trio of families and discuss the possibility that Trigonotarbidae may be paraphyletic. Schlüsselwörter: Karbon, Namurium, Trigonotarbida, Trigonotarbidae, Archaeomartus, neue Art.