Order Lagomorpha Author Wilson, Don E. Author Reeder, DeeAnn text 2005 The Johns Hopkins University Press Baltimore Mammal Species of the World: a Taxonomic and Geographic Reference (3 rd Edition), Volume 1 185 211 book chapter 0-8018-8221-4 10.5281/zenodo.7316519 Ochotona (Ochotona) pusilla (Pallas 1769) [Lepus] pusilla Pallas 1769 , Nova Comm. Imp. Acad. Sci. Petropoli, 13: 531 . Type Locality: "in campis circa Volgam..."; restricted by Ognev (1940) to Samarsk Steppe, near Buzuluk, left bank of Samara River [Orenburgsk Obl. Russia ]. Vernacular Names: Steppe Pika . Subspecies: : Subspecies Ochotona (Ochotona) pusilla subsp. pusilla Pallas 1769 Subspecies Ochotona (Ochotona) pusilla subsp. angustifrons Argyropulo 1932 Distribution: Steppes from middle Volga ( Russia ), east and south through N Kazakhstan to upper Irtysh River and Chinese border. Not yet recorded in China . Conservation: IUCN – Vulnerable (classification refers to subspecies O. p. pusilla only; Formozov, pers. comm). Discussion: Subgenus Ochotona ( Ellerman and Morrison-Scott, 1951 ) . Formerly included O. nubrica (= lama ), O. forresti , and O. osgoodi (a subspecies of thibetana ); see comments therein.