Designation of the lectotype of Somatochlora sahlbergi Trybom, 1889 (Odonata: Corduliidae)

In 1889, Filip Trybom described Somatochlora sahlbergi, based on three male syntypes and one female syntype, and S. theeli, based on two female syntypes, collected on the Swedish expedition to the Yenisey River in 1876. In 1931, K.J. Valle discovered that the type series of S. sahlbergi was heterogeneous since the female syntype was in fact another species, S. alpestris. At the same time, the two female syntypes of S. theeli appeared conspecific with the male syntypes of S. sahlbergi. Acting as the First Reviser, Valle chose the name S. sahlbergi as valid for the species which was actually new to science, but there remained a formal uncertainty of its sense because of the heterogeneity of the type series. In order to formally justify the use of the established name S. sahlbergi for this species, we have designated a male syntype specimen, collected at Dudinskoe village (presently the town of Dudinka) on 30.vii.1876, as the lectotype of S. sahlbergi.