A new Baltoeurypterus (Eurypterida: Cheliverata) from the Wenlock of Norway

The genus Baltoeurypterus previously had two described species, of which B. tetragonophthalmus, (Fisher, 1839), is the best known. A third species, B. henningsmoeni n. sp. is described here, based on two almost complete specimens and several fragments. This species is separated from B. tetragonophthalmus by a broader paddle {L/W-ratio 1.8), a rounder metastoma (L/W-ratio 1.36) and by the presence of small lateral epimerae on the postabdomen. The distal part of a swimming leg of a pterygotid eurypterid is also described. These fossils constitute the oldest eurypterid remains known from Norway.