Two new species of the megadiverse lentic diving-beetle genus Hydrovatus (Coleoptera, Dytiscidae) described from NE Thailand

• Published in: ZooKeys
• Main Authors: Olof Bistrom, Johannes Bergsten
• Format: Article in Journal/Newspaper
• Language: English
• Published: Pensoft Publishers 2016
• Subjects: Zoology; QL1-991; Antarc*; Antarctica
• Online Access: https://doi.org/10.3897/zookeys.632.10483; https://doaj.org/article/149815f1d20e4d499843c2db0e3ff483

Here we describe two new Hydrovatus species (Coleoptera: Dytiscidae: Hydroporinae: Hydrovatini) from the province of Khon Kaen, Isan region in NE Thailand. Hydrovatus is the third most species rich genus of diving beetles (Dytiscidae). It occurs on all continents except Antarctica and now numbers 210 currently recognized species. Both new species, H. diversipunctatus sp. n. and H. globosus sp. n., were collected at lights and are only known from the type locality “Khon Kaen” (a city and province). Diagnoses based on morphology for the separation from closely related species are given together with illustrations of male genitalia and habitus photos. We provide a determination key to Old World species of the pustulatus species group and to Oriental species of the oblongipennis species group.