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Abstract:
A small collection of baetine mayfly nymphs from Taiwan is studied. Six new species in three baetid genera are described in detail. The species are: Baetis taiwanensis
sp.n., Baetis tatuensis sp.n., Baetis pseudofrequentus sp.n., Pseudocloeon latum sp.n.,
Pseudocloeon ultimum sp.n. and Neobaetiella macani sp.n. A new species group within
Pseudocloeon, the latum group, is proposed. The newly described species of Baetis and
Pseudocloeon are the first nymphal species records of these genera from Taiwan. The
gents Bactiella UENO, 1931, is discussed. The type species Baetiella japonica IMANISHI,
1930, is transferred to Pseudocloeon, hence Baetiella became a junior synonym of Pseudocloeon. The new genus Neobaetiella is established; it includes Baetiella japonica na IMANISHI, 1940 (nymph), Baetiella sp. UENO, 1955 (nymph) and the herein described Neobaetiella macani sp.n. Baetiella japonica na is the type species of Neobaetiella and its name
is replaced by Neobaetiella uenoi comb. nov.
