Hydaticus palliatus Aubé, 1838

Megna, Yoandri S., Balke, Michael, Apenborn, Rico & Hendrich, Lars, 2019, A review of Peruvian diving beetles of the genus Hydaticus Leach, 1817, with description of Hydaticus (Prodaticus) panguana sp. nov. and notes on other Neotropical species (Coleoptera: Dytiscidae), Zootaxa 4615 (1), pp. 113-130 : 122-123

Hydaticus palliatus Aubé, 1838

( Fig. 3B )

Hydaticus palliatus Aubé, 1838: 195 ; Gemminger & Harold 1868: 466; Sharp 1882a: 665; Branden 1885: 102; Zimmermann 1920a: 223; Blackwelder 1944: 79; Trémouilles 1996: 22; Benetti et al. 2003a: 10; Benetti et al. 2003b: 40; Benetti & Régil- Cueto 2004: 7; Ferreira (Jr.) & Braga 2009: 324; Nilsson & Hájek 2019: 95.

Hydaticus incaustus Aubé 1838 ; Gemminger & Harold 1868: 465; synonymy by Sharp 1882a: 666.

Hydaticus isabelii Aubé 1838: 187 ; Gemminger & Harold 1868: 465; synonymy by Sharp 1882a: 666.

Type locality. Brazil .

Material examined. PARAGUAY: “ Paraguay, Dept. Guaira, Calle Florida , 13.-16.II.1993, leg. Drechsel ”, 4 exs., ( CGW); “ Paraguay, Guaira Department, Calle Florida, Quelltümpel, 26.viii.1993, U. Drechsel leg.”, 13 exs. , ( ZSM) ( NMW); “ Paraguay, Zorilla , 16-20.x.1992, U. Drechsel leg.”, 1 ex., ( CLH) ; “ Paraguay , Villarrica, Sammlung A. Zimmermann”, 2 exs., ( ZSM) ; “Paraguay, Sammlung A. Zimmermann”, 1 ex., ( ZSM) . BRAZIL: “ Brasilien , Rio Grande do Sul, Sammlung A. Zimmermann ”, 1 ex., ( ZSM) ; “ Brazil , vi.1901, Sammlung A. Zimmermann ”, 3 exs., ( ZSM) ; “Brazil, C. L. Müller”, 1 ex., ( ZSM) ; “ Brazil, Manaos , Cachoeirinha”, 5 exs., ( NMW) ; “ Santa Catarina, Nova Teutonia , 27°11ʹS 52°23ʹW, 15.XII.1946, leg. F. Plaumann ”, 1 ex., ( AMNH) .

Diagnosis. TL 13.0– 13.6 mm; TL-H = 12.2–12.9 mm; MW 6.6–7.3 mm; pronotum testaceous with a narrow black band on the anterior and posterior margin; elytron with sublateral and lateral yellowish stripes, subbasal transverse fascia absent, and with apex largely irrorated ( Fig 3B ); protarsomere I without a series of spines across the dorsal surface; metatibia with bifid setae curved ventrad basally on posterior surface; median lobe of aedeagus with apex angulate in lateral view (see Trémouilles 1996).

Differential diagnosis. Hydaticus palliatus is very variable in size, between 12.1–15.4 mm ( Trémouilles 1996) and can be confused with H. inexspectatus . The two species can be separated by their different colour patterns of elytra and shape of median lobes.

Distribution. Hydaticus palliatus is known from Brazil, Paraguay and Argentina ( Trémouilles 1996; Benetti et al. 2003b, 2003b; Benetti & Régil-Cueto 2004; Ferreira (Jr.) & Braga 2009).

Ecology. Knowledge of the biology of Hydaticus palliatus is limited. Trémouilles (1996) reported this species from habitats located in lowlands between 300–700 m (a.s.l).

Figures

FIGURE 3. Dorsal habitus of H. fractivittis (A) and H. palliatus (B), both from Paraguay, and H. rimosus (C) from Guatemala. Scale bar = 5 mm.