Abstract

TREMOUILLES, Edgardo R.; MICHAT, Mariano C.  and  TORRES, Patricia L. M.. A synopsis of the South American Hydrovatus (Coleoptera: Dytiscidae: Hydroporinae), with notes on habitat and distribution, and a key to species. Rev. Soc. Entomol. Argent. [online]. 2005, vol.64, n.1-2, pp.61-69. ISSN 0373-5680.

We revised the South American members of the genus Hydrovatus Motschulsky. Each of the three recognized species is diagnosed, with emphasis on diagnostic characters. A key summarizing the main differences is provided. To identify South American specimens of H. caraibus Sharp, they were compared with Central American specimens, including type material. Based on the material examined, H. caraibus is a species broadly distributed in Central and South America, with representatives of different areas separated by minor differences. The geographical distributions of the three species are considerably enlarged: H. crassulus Sharp and H. turbinatus Zimmermann are recorded for the first time from Paraguay, and H. caraibus is recorded for the first time from Argentina and Nicaragua. Bionomical information of the species is presented.

Keywords : Aquatic beetles; Dytiscidae; Hydrovatini; Neotropical Region; Argentina.

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