Fig. 4 in Fig. 4 in Fig. 3 in Fig. 21. Sesarmops mora n in Paralbunea dayriti Author Jouladeh-Roudbar, Arash Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Alborz, Iran. E-mail: jouladehroudbar @ ut. ac. ir jouladehroudbar@ut.ac.ir Author Ghanavi, Hamid Reza Department of Biology, Lund University, Lund, Sweden. * Correspondence: E-mail: hamid. ghanavi @ gmail. com (Ghanavi) hamid.ghanavi@gmail.com Author Doadrio, Ignacio Biodiversity and Evolutionary Biology Department, Museo Nacional de Ciencias Naturales-CSIC, Madrid, Spain. E-mail: doadrio @ mncn. csic. es doadrio@mncn.csic.es text Zoological Studies 2020 2020-06-29 59 21 1 303 http://dx.doi.org/10.5281/zenodo.12822535 journal article 10.6620/ZS.2020.59-21 1810-522X Huso huso (Linnaeus, 1758) – Native ( Fig. 26 ) Fig. 23. Distribution map of Acipenser ruthenus . Fig. 24. Acipenser stellatus . Photograph from a fish farm close to Sari, Caspian Sea basin. Acipenser huso Linnaeus [C.] 1758: 238; Type locality: Danube and the rivers of Russia . No types known. Acipenser albula Forster [J. R.] 1767: 354; Type locality: Volga River, Russia . No types known. Acipenser beluga Forster [J. R.] 1767: 354; Type locality: Volga River, Russia . No types known. Acipenser shyp Forster [J. R.] 1767: 353; Type locality: Turkey , Bosphore or Sea of Marmara (Mediterranean Sea). Neotype : NRM 8946 . Acipenser schypa Gmelin [ J. F. ] 1789: 1484; Type locality: Turkey , Bosphore or Sea of Marmara ( Mediterranean Sea ). Neotype : NRM 8946 . Acipenser ichthyocolla Billberg [G. J.] 1833: 52; Type locality: Danube and the rivers of Russia . No types known. Huso ichthyocolla Bonaparte [C. L.] 1846: 22; Unneeded new name for Acipenser huso Linnaeus 1758 . Acipenser vallisnerii Molin [R.] 1853: 366, 371; Type locality: Po River, Italy . Acipenser maeoticus Sal’nikov [N. I.] & Malyatskii [S. M.] 1934: 44; Type locality: Sea of Azov. No types known. Huso huso ponticus Sal’nikov [N. I.] & Malyatskii [S. M.] 1934: 44; Type locality: Black Sea. No types known. Huso huso caspicus Babushkin [N. Ya.] 1942: 131; Type locality: Caspian Sea. No types known. Huso huso orientalis Lelek [A.] 1987: 55; Type locality: Black Sea. Common name : Pr: Fil mahi, Mahi-ye khaviar, En: Beluga. Diagnosis : Very large and massive body, crescent-shaped mouth (small and transverse in other sturgeons) and the gill membranes being joined as a fold across the isthmus. Meristic characters : D: 48–81, A: 22–41, GR: 16–36, DS: 9–17, LSC: 28–60, VS: 7–14. Distribution : Caspian Sea basin ( Fig. 27 ). Translocated from the Caspian Sea basin to the Persis and Tigris basin for aquaculture purposes. See Acipenser gueldenstaedtii . Taxonomy : Berg (1949) placed in Huso . Conservation : IUCN: Critically Endangered A2cde (Gesner et al. 2010a).