A taxonomical study of the genus Esakia Lundblad, 1933 (Heteroptera: Gerromorpha: Gerridae), with descriptions of two new species from Borneo

摘要

Two new species of the genus Esakia Lundblad, 1933 are described, both from Borneo: Esakia borneensis sp. n. and E. mazzoldii sp. n. For the first time, E. johorensis Cheng, 1966 is reported from Sumatra; E. hungerfordi Miyamoto, 1967 from Sarawak and Sabah; and E. lundbladi Cheng, 1966 from Thailand (Narathiwat Province). The taxonomy of E. kuiterti Hungerford and Matsuda, 1958 and E. hungerfordi is discussed. Esakia hungerfordi, previously considered by Polhemus (1992) as a synonym of E. fernandoi, is treated here as a separate species from the latter. Easkia kuiterti, which was also synonymised with E. ventidioides Lundlblad, 1933 by Polhemus (1992), is considered valid species.