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

Abstract

Two new species of the genus Esakia Lundblad, 1933Lundblad, O.M. (1933), ‘Zur Kenntnis der aquatilen und semi-aquatilen Hemipteren von Sumatra, Java und Bali’, Archiv für Hydrobiologie Supplementum , 12, 1–195, 263–489. [Google Scholar] are described, both from Borneo: Esakia borneensis sp. n. and E. mazzoldii sp. n. For the first time, E. johorensis Cheng, 1966Cheng, L. (1966), ‘Three New Species of Esakia Lundblad (Heteroptera: Gerridae) from Malaya’, The Proceedings of the Royal Entomological Society of London , 35(1–2), 16–22. [Google Scholar] is reported from Sumatra; E. hungerfordi Miyamoto, 1967Miyamoto, S. (1967), ‘Gerridae of Thailand and North Borneo Taken by the Joint Thai-Japanese Biological Expedition 1961–62’, Nature Life Southeast Asia , 5, 217–257. [Google Scholar] from Sarawak and Sabah; and E. lundbladi Cheng, 1966Cheng, L. (1966), ‘Three New Species of Esakia Lundblad (Heteroptera: Gerridae) from Malaya’, The Proceedings of the Royal Entomological Society of London , 35(1–2), 16–22. [Google Scholar] from Thailand (Narathiwat Province). The taxonomy of E. kuiterti Hungerford and Matsuda, 1958Hungerford, H.B., and Matsuda, R. (1958), ‘The Genus Esakia Lundblad with Two New Species (Heteroptera, Gerridae)’, Journal of the Kansas Entomological Society , 31(3), 193–197. [Google Scholar] and E. hungerfordi is discussed. Esakia hungerfordi, previously considered by Polhemus (1992Polhemus, J.T. (1992), ‘Nomenclatural Notes on Aquatic and Semiaquatic Heteroptera’ [Short communications], Journal of the Kansas Entomological Society , 64(4), 438–443.[Web of Science ®] , [Google Scholar]) 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 (1992Polhemus, J.T. (1992), ‘Nomenclatural Notes on Aquatic and Semiaquatic Heteroptera’ [Short communications], Journal of the Kansas Entomological Society , 64(4), 438–443.[Web of Science ®] , [Google Scholar]), is considered valid species. http://zoobank.org/urn:lsid:zoobank.org:pub:F6E94274-2305-4096-9186-2D799124E2FA