Gammarus sirvannus Hekmatara, Sari & Heidari Baladehi, 2011

Zamanpoore, Mehrdad, Grabowski, Michal, Poeckl, Manfred & Schiemer, Friedrich, 2011, Taxonomic review of freshwater Gammarus (Crustacea: Amphipoda) from Iran, Zootaxa 3140, pp. 1-14 : 11

Gammarus sirvannus Hekmatara, Sari & Heidari Baladehi, 2011

Gammarus sirvannus Hekmatara, Sari & Heidari Baladehi, 2011: 49 –56, Figs. 8–13.

Locus typicus. Sirvan River-Paveh branch (N 35º 0 7ʹ, E 46º 15ʹ), 25 Km west of Paveh city, Kermanshah province, Iran.

Material examined. Paratypes, September 2008, leg. M. Hekmatara ( ZUTC amph. 2251).

Distribution. This species was found only in locus typicus in north-west of the Zagros, in western Iran.

Ecological notes. This cold mountainous region lies at an altitude of ca. 700 m asl.

Taxonomic remarks. Long setation of antenna 2 makes G. sirvannus resembling a few other species present in the same region. However, in G. komareki , such setae are slightly curled, it has small eyes, lacks the distinctly projecting postero-distal corner lobe in bases of pereopods 6–7, and has few short setae on pereopod 5–7. Elongated eyes and setation of antenna 2 make G. sirvannus similar to G. loeffleri and to G. shirazinus , but the latter differ with highly setose pereopod 3–7. G. parthicus may be obviously told apart from G. sirvannus by the small eyes and lack of distinct projection in postero-distal corner of pereopod 6–7 bases in the former species. In a detailed examination, presence of a single long seta on the first article of mandible palp is a deciding criterion to differentiate G. sirvannus from all the other similar species.