The biostratigraphically important didymograptid graptolites Didymograptus balticus Tullberg and Didymograptus protobalticus Monsen are redescribed using type specimens, as well as newly discovered material from Scandinavia. It is concluded that D. balticus is a rare species. Its age is shown to be restricted to the early Bendigonian (Be 1-2). Its range overlaps considerably with that of the closely related but more long-ranging and common D. protobalticus.
Jörg Maletz, Ernst-Moritz-Arndt-Universität, Institut for Geologie und Palaontologie, Friedrich-Ludwig-Jahn-Str. 1 7a D-17489 Greifswald, Germany.