A Review of the Genus from Chinese Mainland (Ephemeroptera: Baetidae).

The widely distributed and species diverse genus Leach, 1815 has never been reviewed in China, although nine species names have been reported from this country. After checking types of two species ( and ) and newly collected materials from more than 50 sites, four species are recognized, compared, and photographed in this research. Among them, the species Kimmins, 1947 is first recorded in China, and its nymphs are described for the first time. The distribution in China of two other species ( (Linnaeus, 1761) and (Kimmins, 1947)) are also confirmed. The two species established by Navás ( Navás, 1933 Bruggen, 1957, Navás, 1933, syn. nov.) and the species named by Tong and Dudgeon in 2021 are synonymized with Navás, 1931-the fourth species in this study. Furthermore, the Klapálek, 1905 from the Chinese mainland, found by Ulmer in 1925, is also regarded as the last species. Among the four species, the and seem closer because of the similar female color patterns of their stigma and ventral abdomen, while the species and are more alike because they have neither pigmented stigma nor stripes on abdominal sterna.