caspicus, Huso huso Babushkin [N. Ya.] 1942:131 [Izvestiia Azerbaidzhankoi nauchno-issledovatel'skpi rybokhoziaistvennoi stantsii. Baku, Russia. No. 7; ref. 21746] Caspian Sea. No types known. •Synonym of Huso huso (Linnaeus 1758), but a valid subspecies as described -- (Lelek 1987:55 [ref. 22962], Esmaeili et al. 2018:7 [ref. 36089]). •Synonym of Huso huso (Linnaeus 1758) -- (Berg 1948:61 [ref. 12882], Coad 1995:7 [ref. 23608], Kottelat 1997:34 [ref. 22952], Esmaeili et al. 2017:26 [ref. 35254], Jouladeh-Roudbar et al. 2020:19 [ref. 37983], Çiçek et al. 2024:31 [ref. 40789]). Current status: Synonym of Huso huso (Linnaeus 1758). Acipenseridae. Habitat: freshwater, brackish, marine.