primigenius, Acipenser Chalikov [B. G.] 1944:47 [Zoologicheskii Zhurnal v. 23 (no. 1); ref. 13170] Northern Caspian Sea. No types known. •Hybrid of Acipenser ruthenus x Acipenser gueldenstaedti -- (Berg 1948:77 [ref. 12882], Kottelat 1997:183 [ref. 22952], Çiçek et al. 2024:29 [ref. 40789]). Hybrid. Current status: Synonym of Huso. Acipenseridae. Habitat: freshwater, brackish, marine.