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)

Abstract

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.