pygmaeus, Acipenser Reisinger [J.] 1830:93 [Specimen ichthyologiae sistens pisces aquarium dulcium Hungariae; ref. 18620] Objectively invalid; preoccupied by Acipenser pygmaeus Pallas 1814. •Synonym of Acipenser gueldenstaedtii Brant & Ratzeburg 1833 -- (Kottelat 1997:30 [ref. 22952], Jouladeh-Roudbar et al. 2020:14 [ref. 37983]). 1°Homonym. Current status: Synonym of Acipenser gueldenstaedtii Brandt & Ratzeburg 1833. Acipenseridae. Habitat: freshwater, brackish, marine.