Five species of the genus Labiobaetis (Baetidae) are recognized from China based on mature nymphs, including a new species, Labiobaetis ancoralis n. sp. and a new combination, Labiobaetis mustus (Kang & Yang) n. comb. The new species differs from L. multus (Müller-Liebenau) and L. pulchellus (Müller-Liebenau & Hubbard) by the spatulate submarginal setae on labrum and the apical segment of maxillary palpus with a pronounced excavation near apex. Imago stage of L. mustus (Kang & Yang) n. comb. is described for the first time based on male and female imagoes reared from nymphs, which can be distinguished from other known imagoes of Labiobaetis by the color pattern of abdominal terga and hind wing having a tiny vestigial costal process. All Oriental species previously transferred to Pseudocloeon are reassigned to Labiobaetis in the present paper. An identification key is provided to the known mature nymphs of Oriental Labiobaetis species.

Taxonomic notes on the genus Baetiella Uéno from China, with the descriptions of three new species (Ephemeroptera: Baetidae)

A new species of Baetidae, Gratia baibungensis sp. n., is described and illustrated based on nymphal stage collected from the southeastern Tibet (Xizang) and the genus is reported for the first time from China. This new species can be readily differentiated from its congeners by the absence of a protuberance on the posterior margin of the abdominal tergum X, glabrate simple submarginal setae on the labrum, and the posterior margin of sterna VI–IX having much longer spatulate setae.

Six species of Bungona Harker, including three species of the subgenus Centroptella Braasch & Soldán and three species of subgenus of Chopralla Waltz & McCafferty, are reported from China. Of which, three new species, Bungona (Centroptella) ovata sp. nov., Bungona (Centroptella) quadrata sp. nov. and Bungona (Chopralla) bifida sp. nov., are described based on nymphal materials. In addition, Bungona (Chopralla) liebenauae (Soldán, Braasch & Muu, 1987) that was previously known only from Vietnam is newly recorded in China. An identification key to Bungona species known from Oriental Region is presented.

Cloeon micki sp. n., a new species of baetid mayfly from China is described and illustrated based on larval and imaginal stages associated by laboratory rearing. The new species is characterised by the presence of a dark brown or dark purple elliptical marking on abdominal tergites II and V, which readily distinguishes it from other members of the genus Cloeon Leach, 1815 Leach, W.E. (1815), ‘Entomology’, Brewster’s Edinburgh Encyclopaedia, 9, 57–172. [Google Scholar] . The known distribution of the new species is Hong Kong, Guangdong and Henan provinces. http://www.zoobank.org/urn:lsid:zoobank.org:pub:7ED660DD-513B-4A0E-AC68-877D7DC5E7D4

Two new species of Nigrobaetis Kazlauskas (in Novikova & Kluge), 1987 are described from Southwest China: Nigrobaetis bilongus sp. nov. based on larval and imaginal materials which are reared from larvae; Nigrobaetis trialbus sp. nov. based on larval stage.