Taxonomic review of freshwater Gammarus (Crustacea: Amphipoda) from Iran Author Zamanpoore, Mehrdad Author Grabowski, Michal Author Poeckl, Manfred Author Schiemer, Friedrich text Zootaxa 2011 3140 1 14 journal article 45727 10.5281/zenodo.205631 d203873a-602b-4c12-9c8f-17c51609cf74 1175-5326 205631 Gammarus bakhteyaricus Khalaji-Pirbalouty & Sari, 2004 Gammarus bakhteyaricus Khalaji-Pirbalouty & Sari, 2004 : 2435 –2440, Figs. 5–7; Ebrahimnezhad, Hosseini & Sari, 2005 : 225 , Fig. 5. Locus typicus. Chaghakhor, Chaharmahal Va Bakhtyari Province, ( 31º55'N , 50º55'E ). Material examined. Holotype , 6 August 2000 ( ZUTC Amph. 2030). Paratypes , Bizhgerd spring, Chaharmahal Va Bakhtyari Province ( 31º47'N , 51º10'E ) ( ZUTC Amph. 2032). Distribution. Endemic, restricted to localities in central Zagros: Chaharmahal Va Bakhtyari Province (Khalaji- Pirbalouty & Sari, 2004 ) and Esfahan ( Ebrahimnezhad et al., 2005 ) provinces ( Fig. 1 ). Ecological notes. Habitats in high altitudes ( 2300 m asl) with slow water current are inhabited by this species. Taxonomic remarks. This species is characterized by presence of 2–3 tiny spines (or “short robust setae”) on distal-ventral corner of first peduncle segment of antenna 1 ( Khalaji-Pirbalouty & Sari, 2004, Fig. 5 ). Similar feature can only be observed in G. shirazinus , although only 1–2 spines are present in this species ( Zamanpoore et al. , 2010a , Fig. 2). Apart of that, the two species have many differentiating features; most important of them is very long setation of antenna 2 and pereopod 5–7 in G. shirazinus if compared to the former species ( ibid ., Figs. 2, 4). Gammarus bakhteyaricus may also be confused with G. pseudosyriacus and G. lacustris , however in the latter two species, there are no spines on distal-ventral corner of first peduncle segment of antenna 1.