Hydrochus radhakishunae Makhan, 2021

Perkins, Philip D., 2021, Taxonomy of water beetles in the genus Hydrochus Leach, 1817, from Bolivia, Brazil and Paraguay (Coleoptera: Hydrochidae), Zootaxa 4994 (1), pp. 1-93 : 50

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.

Figures

FIGURE 71. Pictorial aid to species groups of Hydrochus from Bolivia, Brazil and Paraguay, using male genitalia. Not to same scale.

FIGURES 28–29. Habitus and male genitalia. 28. Hydrochus curvus n. sp., holotype 29. Hydrochus radhakishunae Makhan.