The first record of Upper Permian and Lower Triassic scorpions from Russia (Chelicerata: Scorpiones)
Several small fragments of fossil scorpions are reported from two localities in Vologda Province, Russia, representing the Upper Permian (Severodvinian, correlated to Wuchiapingian) (Isady) and Lower Triassic just above the Permian-Triassic boundary (Induan) (Nedubrovo). Most observed structures are not diagnostic at genus or family level. The Isady leg fragment possesses ungues (claws), which are both denticulated and setaceous, and resembles a Carboniferous Eobuthus sp. (Eobuthidae). It is the latest record of this type of ungues, which are known in some Paleozoic scorpions (extinct suborder Mesoscorpiones); all extant scorpions have smooth claws without denticulation or setation.
Fet, V., Shcherbakov, D. E., & Soleglad, M. E. 2011 . The first record of Upper Permian and Lower Triassic scorpions from Russia (Chelicerata: Scorpiones). Euscorpius, No. 121: 1-16.