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 Caspiomyzon wagneri (Kessler, 1870) – Native ( Fig. 10 ) Petromyzon wagneri Kessler [K. F.] 1870: 207; Type locality: Volga River between Tver [Tvertsa] and Astrakhan , Russia , 46°21'N , 48°03'E . Syntypes : SMNS 2398 (1), NMW 61053 (1), ZIN 2407 (2). Agnathomyzon ( Haploglossa ) caspicus Gratzianov [V. I.] 1907: 18; Type locality: Kura River near Evlakh, Volga River near Kazan, and Moskva River (Royllier), Russia . No types known. Common name : Pr: Marmahi-e dehangerd, Dahangerd-e daryaye Khazar; En: Caspian lamprey, Round mouth snake fish. Diagnosis : Non parasitic diadromous lamprey. Absence of paired fins, a round, suctorial mouth containing blunt teeth, and seven branchial openings. Tubercular teeth with buttom-like shape. Meristic characters : Trunk myomeres 53–68, supraoral lamina, one unicuspid (sometimes bicuspid) tooth, infraoral lamina, 4–6, usually 5, unicuspid teeth, but sometimes the lateral most ones are bicuspid, 4 endolaterals on each side, endolateral formula, typically 1–1–1–1, 3–5 rows of anterials, first row of anterials, 3 unicuspid teeth; 8 rows of exolaterals on each side, 3 rows of posterials, first row of posterials, 11 unicuspid teeth, transverse lingual lamina straight and 5–8 unicuspid teeth. Distribution : Caspian Sea basin ( Fig. 11 ). Reported from Aras River to Atrak River in the entire southern coast of the Caspian Sea, including Anzali Wetland, Sefidrud, Langerud, Babol rud, Tajan Rivers, etc. Fig. 2. Drainage sub-basin map of Iran. Taxonomy : Berg (1949) placed in Caspiomyzon . Conservation : IUCN: Near Threatened ( Freyhof and Kottelat 2008l ). CLASS CHONDRICHTHYES Order CARCHARHINIFORMES (1 family, 1 genus, 1 species) Family Carcharhinidae (1 genus, 1 species) Genus Carcharhinus Blainville, 1816