Review and contribution to the stonefly (Insecta: Plecoptera) fauna of Azerbaijan Author Murányi, Dávid Department of Zoology, Eszterházy Károly University, Leányka u. 6, H- 3300 Eger, Hungary. Author Manko, Peter Department of Ecology, University of Prešov, 17. novembra 1, SK- 08001 Prešov, Slovakia. Author Kovács, Tibor Mátra Museum of Hungarian Natural History Museum, Kossuth Lajos u. 40, H- 3200 Gyöngyös, Hungary. Author Vinçon, Gilles 55 Bd Joseph Vallier, F- 38100 Grenoble, France. Author Žiak, Matej Andrej Kmeť Museum, Slovak National Museum - Museums in Martin, Andreja Kmeťa str. 20, SK- 03601 Martin, Slovakia. Author Kerimova, Ilhama G. Institute of Zoology, Azerbaijan National Academy of Sciences, 504 th block 1128 th Side Str., A. Abbaszadeh Str., AZ- 1073 Baku, Azerbaijan. Author Snegovaya, Nataly Yurievna Institute of Zoology, Azerbaijan National Academy of Sciences, 504 th block 1128 th Side Str., A. Abbaszadeh Str., AZ- 1073 Baku, Azerbaijan. Author Oboňa, Jozef Department of Ecology, University of Prešov, 17. novembra 1, SK- 08001 Prešov, Slovakia. text Zootaxa 2021 2021-05-24 4975 1 58 80 journal article 6196 10.11646/zootaxa.4975.1.2 b4c650a9-c917-4f03-aeed-e63058aaade7 1175-5326 4804613 EEFD3FFF-79E1-4EED-B74C-295A33CA50DA Perla pallida Guérin-Méneville, 1843 The species was described without exact locality, mentioned only as ’Caucasus’ ( Guérin-Méneville 1843 ). Walker (1851) found its types in the Natural History Museum, London (NHM), though they were lacking from the latest catalog ( Kimmins 1970 ) and, presumably lost during the 19th century. Klapálek (1923) redescribed the species on the basis of specimens from Azerbaijan, Georgia and Turkey . Though some question the conspecificity of these specimens, they have become de facto neotypes on which the present concept of the species is based (e.g., Sivec & Stark 2002 ). Klapálek’s Azerbaijan specimen was a male collected in Gəncə (Gəncə-Qazax region, original labels: Elisabethop; Kolenati; caucasica / det. Kempny; pallida / Klapálek) and still exists in the Natural History Museum of Wien (NHMW). One of us (DM) studied and compared Klapálek’s specimens with our recent specimens from Georgia . Besides the NHMW specimen from the 19th century, Kasymov (1972) reported the species from several sites in Gəncə-Qazax (Dəstəfur), Kəlbəcər-Laçın (Kəlbəcər, Tərtərçay River), Lənkəran (Sahgadzhi), Şəki-Zaqatala (Katexçay River) and Yuxarı-Qarabağ regions (Şuşa, Xankəndi). Sivec & Stark (2002) considered P. pallida to be a species complex that is distributed in the Caucasus, Anatolia , the Balkans and the Carpathians.