The fossil arachnid genus Eurymartus MATTHEW, 1895 and the eurypterid genus Eurypterella MATTHEW, 1889 from the late carboniferous 'Fern ledges' of Saint John, New Brunswick, Canada

摘要

The fossil arachnid genus Eurymartus MATTHEW, 1895 with its two species - E. latus MATTHEW, 1895 and ?E. spinulosus MATTHEW, 1895 - has been widely overlooked in the literature, along with the order Eurymarti MATTHEW, 1895 to which they were assigned. The material on which these names were based comes from the Late Carboniferous (Pennsylvanian: Langsettian) "Fern Ledges" of Saint John, New Brunswick, Canada and is held in the New Brunswick Museum. E. latus is reinterpreted as a rather poorly preserved example of the trigonotarbid arachnid family Anthracomartidae, while Y. spinulosus may also be a trigonotarbid, but is barely identifiable. Both names are treated here as nomina dubia and Eurymarti is here formally synonymised with the younger, but more widely known, ordinal name Trigonotarbida PETRUNKEVITCH, 1949. A further problematic "Fern Ledges" arthropod, Eurypterella ornata MATTHEW, 1889, was described as a eurypterid, but is again barely identifiable and is treated here as a nomen dubium.