Mayfly types and additional material (Insecta: Ephemeroptera) examined by F.-J. Pictet and A.-E. Pictet, housed in the Museums of Natural History of Geneva and Vienna

Abstract: Here we revise the entire Ephemeroptera collection of F.-J. Pictet deposited in the Natural History Museum of Geneva (MHNG) and voucher specimens housed in the Natural History Museum of Vienna (NMW). Due to several unforeseen turns of events, the MHNG collection was already in bad condition at the end of the 19th century. However, the specimens sent by V. Kollar to F.-J. Pictet, and used by the latter for his monograph (1843-1845), have been well curated after their return to the NMW and allow an important nomenclatural change. The species Baetis forcipula F.-J. Pictet, 1843 is now considered a junior subjective synonym of Ephemera venosa Fabricius, 1775, currently Ecdyonurus (Ecdyonurus) venosus (Fabricius, 1775). The specimens described by Thomas in 1968b from southwestern France under the name Ecdyonurus forcipula (F.-J. Pictet, 1843) belong to a new species, Ecdyonurus alaini Bauernfeind sp. nov., which is described herein. Mayfly specimens described by F.-J. Pictet's son, A.-E. Pictet, are also reviewed. Furthermore, information is provided on some other valuable specimens housed in the MHNG and NMW, such as Ametropus fragilis Albarda, 1878 which was already collected in Italy in the 19th century, or Rhithrogena cincta Navás, 1921 from the Spanish Pyrenees, which is the second specimen currently known of this species.