A Scansorial Passerine Bird (Passeriformes, Certhioidea) from the Uppermost Lower Miocene of Eastern Siberia

A new scansorial passerine bird, Kischinskinia scandens gen. et sp. nov., from the uppermost Lower Miocene of the Tagay locality (Olkhon Island, Lake Baikal) is described based on a distal tarsometatarsal fragment. This is the first Asian member of the clade Certhioidea. A tibiotarsal fragment is also tentatively assigned to this taxon. Both bones display adaptations for climbing on a vertical surface. The find of a scansorial passerine bird of the clade Certhioidea is evidence of ecological similarity of Early Miocene avifaunas of southern Eastern Siberia and Western Europe, since a representative of Certhioidea showing a similar level of specialization was described from the Lower Miocene (MN3) of Germany. In addition, Kischinskinia scandens is the earliest reliable member of oscine passerines (Oscines) from Asia.