Stoneflies (Plecoptera) of the Czech Republic: species checklist, distribution and protection status Author Bojková, Jindřiška Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, CZ- 61137 Brno, Czech Republic; e-mail: bojkova @ centrum. cz Author Soldán, Tomáš Institute of Entomology, Biology Centre AS CR, Branišovská 31, CZ- 37005 České Budějovice, Czech Republic; e-mail: soldan @ entu. cas. cz Author Cr, Biology Centre As text Acta Entomologica Musei Nationalis Pragae 2013 2013-11-15 53 2 443 484 journal article 10.5281/zenodo.5740806 0374-1036 5740806 19BCCF8A-90B6-4717-BBF9-C6E8EF474BE8D Isoperla difformis Klapálek, 1909 Isoperla difformis Klapálek, 1909 in KLAPÁLEK & GRÜNBERG (1909) : 51 (original description) Comment. The species was described by Klapálek in KLAPÁLEK & GRÜNBERG (1909) , from ‘Dresden (Schiller), Bohemia and Denmark’. Type locality was limited to ‘Dresden, Germany’ by ILLIES (1966) but did not designate the lectotype . In 1980, P. Zwick labelled one ♀ of I . difformis (Dresden, leg. Schiller) in the Klapálek collection as lectotype . However, this designation was not published. The material mentioned in KLAPÁLEK & GRÜNBERG (1909) was previously used by KLAPÁLEK (1900) for the description of the male and the larva of Chloroperla helvetica Schoch, 1885 : Zlatá stoka stream near Třeboň ( April 1896 and 15. 4. 1897 ), Nežárka river in Veselí ( 28. 4. 1897 ) and Dresdner Haide in Dresden ( 1 ♂ 2 ♀♀ , 30. 4. 1889 , leg. Schiller). Material from Zlatá stoka and Nežárka is deposided in the Klapálek collection and actually represents Isoperla difformis . Chloroperla helvetica Schoch, 1885 is considered a junior synonym of Isoperla rivulorum (Pictet, 1841) according to ILLIES (1955) . All the above mentioned material is deposited in the National Museum in Prague , the Klapálek collection.