stenorrhynchus, Acipenser Nikolskii [A. M.] 1896:400 [Ezhegodnik, Zoologicheskago Muzeya Imperatorskoi Akademii Nauk v. 1; ref. 14614] Large rivers of Siberia flowing to the Arctic. Syntypes: ZIN 10641 (2), 10885 (1), 10888 (1). ZISP 10641 also type of variety baicalensis. •Synonym of Acipenser baerii Brandt 1869 -- (Berg 1948:86 [ref. 12882], Kottelat 2006:15 [ref. 28831]). •Synonym of Acipenser baerii Brandt 1869, but a valid subspecies stenorrhynchus Nikolskii 1896 -- (Chereshnev 1996:599 [ref. 24659] as stenorhynchus, Chereshnev et al. 2001:32 [ref. 26736] as stenorhynchus, Reshetnikov 1997:725 [ref. 24702], Sokolov 1998:19 [ref. 23571], Bogutskaya & Naseka 2004:23 [ref. 28183], Ocock et al. 2006:26 [ref. 28933], Parin et al. 2014:40 [ref. 33547], Romanov et al. 2017:820 [ref. 35687], Jouladeh-Roudbar et al. 2020:13 [ref. 37983]). Current status: Synonym of Acipenser baerii Brandt 1869. Acipenseridae. Habitat: freshwater, brackish.