Taxonomy of water beetles in the genus Hydrochus Leach, 1817, from Bolivia, Brazil and Paraguay (Coleoptera: Hydrochidae) Author Perkins, Philip D. text Zootaxa 2021 2021-06-28 4994 1 1 93 journal article 10.11646/zootaxa.4994.1.1 1175-5326 5043261 107FCA64-345F-40A4-99D3-5C1441EEAD93 Hydrochus radhakishunae Makhan , new status Figs. 29 , 71 Hydrochus radhakishunae Makhan : 1994: 39 Hydrochus pumilio Knisch ; Oliva (1996) ; incorrect synonymy by Oliva (1996) Originally described from Paraguay . Images of the habitus and male genitalia are given herein ( Fig. 29 ). New locality and deposition data of records from Brazil and Paraguay are given below. Material examined (16): Brazil : Santa Catarina , Nova Teutonia , elev. 300–500 m ( 27°11’S , 52°28’W ), 1–29.ix.1972 , leg. Fritz Plaumann (7 NMNH ) . Paraguay : Alto Parana , Estancia Dimas , ( 25°33’S , 55°13’W ), 17–22.ii.2005 , leg. U. Drechsel (8 NMW ) ; Dep. Concepcion , Stillwasser des Arroyo Toro Paso , Seitenam (Uferschlamm), ( 23°51’S , 56°46’W ), 25.x.2002 , leg. U. Drechsel (1 NMW ) . Remarks. I have examined the holotype , including the male genitalia, of H. radhakishunae (ZMHB) , and the lectotype of H. pumilio (RBINS) (see figures in Perkins, 2019a ), and conclude without doubt that they represent different species. The locality data of the specimen imaged, from Nova Teutonia, ( Fig. 29 ) is given above.