Lithobius (Ezembius) ostiacorum Millipede and centipede assemblages on the northern and southern slopes of the lowland Altais, southwestern Siberia, Russia (Diplopoda, Chilopoda) Nefediev, Pavel S. Farzalieva, Gyulli Sh. Tuf, Ivan H. Nedoev, Khozhiakbar Kh. Niyazov, Saparmurad T. ZooKeys 2018 741 219 254 3VHTF Stuxberg, 1876 Stuxberg 1876 Chilopoda Lithobiidae Lithobius CoL Animalia Lithobius (Ezembius) ostiacorum Lithobiomorpha 8 227 Arthropoda species ostiacorum Ezembius   Lithobius (Ezembius) ostiacorum- Nefediev et al. 2017c: 13; 2017d: 218: map.  Material examined (all from Russia, southwestern Siberia, Altai Province, Charysh District, ca. 4.5 km SE of Charyshskoye Village). 1 ♀ (ZMUM), foot of S slope of mountain, Padus aviumand Populus tremulastand near brook, hand sampling, 31.05.2016; 1 ♀ (ASU), site 1 on N slope, soil sample 1 (0-10 cm deep), 2.06.2016; 1 juv. (ASU), site 1 on N slope, soil sample 2 (0-10 cm deep), 2.06.2016; 1 ♂ (ASU), site 1 on N slope, soil sample 3 (litter), 2.06.2016; 1 ♀, 1 juv. (ASU), site 1 on N slope, soil sample 5 (0-10 cm deep), 2.06.2016, all leg. P.N., Kh.N., S.N., V.S.; 1 ♀ (ASU), site 1 on S slope, soil sample 3 (0-10 cm deep), 12.07.2016; 2 ♀♀, 1 juv. (ASU), site 1 on N slope, soil sample 2 (0-10 cm deep), 12.07.2016; 1 ♂, 1 juv. (ASU), site 1 on N slope, soil sample 5 (0-10 cm deep), 12.07.2016; 1 juv. (ASU), site 2 on N slope, soil sample 2 (0-10 cm deep), 13.07.2016; 1 ♀ (ASU), site 2 on N slope, soil sample 4 (10-20 cm deep), 13.07.2016, all leg. Kh.N., S.N., V.S.; 2 juv. (ASU), site 1 on S slope, soil sample 5 (0-10 cm deep), 22.08.2016; 1 juv. (ASU), site 2 on N slope, soil sample 2 (0-10 cm deep), 23.08.2016; 2 juv. (ASU), site 2 on N slope, soil sample 3 (0-10 cm deep), 23.08.2016, all leg. P.N., Kh.N., S.N., V.S.; 1 ♂ (PSU), Betula pendulaand Populus tremulastand on N slope, 51°21'33.8"N, 83°37'23.2"E, 518 m a.s.l., hand sampling, 20.06.2017, leg. P.N.  Distribution. Southern Siberian boreal range with isolated Yenisei population: this species has previously been recorded in the Yenisei River area, Krasnoyarsk Province and Irkutsk Area (central and eastern Siberia, respectively) ( Zalesskaja 1978), also recently found in northern Mongolia ( Poloczek et al. 2016), Altai Province ( Nefediev et al. 2017c) and Republic of Altai ( Nefediev et al. 2017d).  Remarks. The above record of L. ostiacorum, recently announced at the 17th International Congress of Myriapodology ( Nefediev et al. 2017c), can be considered as the first formal find of the species in SW Siberia. In the study localities, the species was found more frequently on N facing habitats.