SCIENTIFIC NAME: Hypsugo Kolenati, 1856
COMMON NAMES: Serotine-like pipistrelles
DESCRIPTION: Member of the family Vespertilionidae. Formerly often was included into Pipistrellus as a subgenus or as a set of species groups. Includes ca. 15 species. Small serotine-like bats. Muzzle short and broad. Ears short, tragus with broadly blunt tip. Fur dense, from dark-brown to sandy-pale in color. Calcar with weak and narrow keel. Small upper premolar always intruded from tooth row, variably reduced, sometimes absent. Lower molars of myotodont type. There are two upper and three lower pairs of incisors. Karyotype consists of 44 chromosomes.
DISTRIBUTION: From south of temperate zone in Europe, Central Asia and Russian Far East to South Africa and Greater Sunda Islands; also in North America.
NATURAL HISTORY: Species of this genus inhabit various landscapes, from deserts to evergreen forests, spread in mountains up to the altitudes of ca. 2600 m ASL. Roost in buildings, hollow trees and rock crevices, preferring split-like shelters. Fast and maneuverable aerial insectivores.

One (probably two) species occur in Russia and adjacent countries:
Savi's pipistrelle — Hypsugo savii