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 Acipenser baerii Brandt, 1869 – Non-native ( Fig. 14 ) Acipenser baerii Brandt [J. F.] 1869: 115; Type locality: Ob and Lena river systems, Siberia, Russia . Syntypes : whereabouts unknown. Acipenser Nikolskii stenorrhynchus [A. M.] 1896: 400; Type locality: Large rivers of Siberia flowing to the Arctic. Syntypes : ZIN 10641 (2), 10885 (1), 10888 (1). ZISP 10641 also type of variety baicalensis . Acipenser stenorrhynchus var. baicalensis Nikolskii [A. M.] 1896: 401; Type locality: Lake Baikal, Siberia, Russia . Syntypes : MLSU 1631 (1), ZIN 10641 (2). Acipenser baeri hatys Dryagin [P. A.] 1948: 532; Type locality: From Lena to Kolyma rivers, Sakha-Yakutia, northeastern Russia . Syntypes : (27). Common name : Pr: Tas mahi baeri, En : Siberian sturgeon. Diagnosis : Extended snouts, four barbels in front of the mouth, the back is light grey to dark-brown colored, the belly color varies from white to clear yellow. Five rows of scutes, Small star-like scutes between the main ones. Clearly slit inferior lips. Meristic characters : D: 30–56, A: 17–33, GR: 20–49, DS: 10–12, LSC: 32–62, VS: 7–16. Distribution : Caspian Sea basin ( Fig. 15 ). Introduced to Iran for aquaculture purpose. Usually individuals of this species escape from fish farms to water bodies. Presence in Iran inland water needs confirmation. Taxonomy . Conservation : IUCN: Endangered A2bcd+4bcd (Native population, Ruban and Zhu 2010 ), PC: Non-native, Not Applicable.