Baetidae from Taiwan with remarks on Baetiella UENO, 1931 (Insecta, Ephemeroptera)

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

Review of the original material of the baetid genera Baetis and Pseudocloeon from the Sunda Islands and the philippines described by G. Ulmer, with some general remarks (Insecta: Ephemeroptera)

The baetid genera Baetis and Pseudocloeon from the Sunda Islands and the Philippines which were described by Ulmer (1913, 1924 and 1939) are examined. These include: Baetis javanicus, B. sumatrana, B. olivascens, Acentrella fulmeki, Pseudocloeon kraepelini, Ps. obscurum, Ps. boettgeri,, Pseudocloeon sp. 1, Pseudoìcloeon sp. 2. Based on study Acentrella fulmeki is transferred to the genus Baetis and named B. novatus sp. n. Tw males, which are signed by Ulmer ,,Pseudocloeon Kraepelini Klap?" belong to two different species of the genus Baetis and are slosely related to the European atrebatinus group. They are described and named Baetis ulmeri sp. n. and B. necopinatus sp. n. The genus Acentrella Bengtsson, 1912, is restablished

Baetidae from Sabah (east Malaysia) (Ephemeroptera)

The nymphs of five new species from Sabah /E. Malaysia/ included in four genera of the family Baetidae are described in detail. They are: Platybaetis probus sp.n., Baetis borneoensis sp.n., Baetis sabahensis sp.n., Pseudocloeon proxinium sp.n., Centroptella pusilla sp.n. These newly described species are the first nymphal species records of baetine mayflies from Sabah and Borneo. The phylogenetic allocations to species groups and the affinities of the Baetidae from Sabah with previously described baetid species from the Sunda Islands, the Philippines, W. Malaysia, Sri Lanka /Müller-Liebenau, in press/ and the Bismarck Archipelago are discussed

Baetidae From Sri Lanka with Some General Remarks on the Baetidae of the Oriental Region (Insecta: Ephemeroptera)

The nymphs of nine species of baetid mayflies from Sri Lanka are described in detail. These include Baetis frequentus sp.n., B. acceptus sp.n., B. conservatus sp.n., B. collinus sp.n., B. geminatus sp.n., B. pulchellus sp.n., B. ordinatus sp.n., and Procloeon regularum sp.n. A single nymph of Cloeon appears closely related to Cloeon bimaculatum Eaton. The first four species mentioned do not fit in any known species-group. Baetis geminatus sp.n. and B. pulchellus sp.n. are associated with the Oriental molawinensis species-group (which corresponds to the European atrebatinus species-group and to the North American propinquus species-group). The sumigarensis sub-group is proposed within the molawinensis species-group. The nymphs described herein are the first nymphs to be described in the family Baetidae from Sri Lanka. The genus Procloeon is recorded from the Oriental Region for the first time. A key to the baetid nymphs of Sri Lanka is included

Teil III: buceratus-, atrebatinus-, niger-, gracilis- und muticus-Gruppe

The chorionic structures of the eggs of 9 European Baetis-species of the buceratus-, atrebatinus-, ,tiger-, gracilis-, and muticus-group are examined under a scanning electron microscope. The surface features of the chorion of the species studied in this paper are species-specific. V/ithin a single species-group there are no greater conlormities ofthe features. Only B. calcaratus, B. gracilis, and perhaps B. buceratus show structures apparently,useful for attachment. Micropylar openings are not found. The eggs ollinal instar nymphs and subimagoes are covered with an adhesive layer. Finally, a detailed discussion is given of the results of all 3 parts of the study