4. Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833

Common name. Russian sturgeon

Taxonomy. Original description: Acipenser gueldenstaedtii Brandt & Ratzeburg, 1833: 13, pl. 3 (figs. 2, 2A-E) [Caspian Sea and tributaries; Black Sea; no types known].

Revisions. Berg (1948: 78).

Illustrations. Kottelat & Freyhof (2007: 51, fig.).

Distribution in Iran. —Distribution in River Basin: Caspian Sea.—Distribution in Ecoregions: 434-Kura-South Caspian Drainages, 450-Turan Plain, 452-Caspian Marine.

Status in Iran. [Native].—Tas mahi baeri.—Listed in previous checklists from Iran by Esmaeili et al. (2017 a, 2018); Jouladeh-Roudbar et al. (2020) and Eagderi et al. (2022).—Iran material: None.

Conservation. —IUCN: CR.