Hydaticus rimosus 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 : 123

Hydaticus rimosus Aubé 1838

( Fig. 3C )

Hydaticus rimosus Aubé, 1838: 182 ; Gundlach 1891: 40; Spangler 1981: 167; Roughley & Pengelly 1981: 274; Epler 1996: 3.50; Larson et al. 2000: 800; Fernández 2001: 30; Peck 2005: 46; Miller et al. 2009: 597; Megna & Sánchez-Fernández 2016: 168; Nilsson & Hájek 2019: 96.

Prodaticus rimosus ( Aubé, 1838) ; Epler 2010: 5.110.

Type locality. Cuba .

Material examined. MEXICO: “ Mexico, Baja California Sur, Santiago , 21-xi-1979, G. Challet leg.”, 2 exs. ( NMW) ; “ Mexico, Prov. Quintana Roo, feed of Laguna Cocom , 40 km S Filipe Carrillo Puerto, 10 m, 19.VII.2008, leg. Wewalka ”, 2 exs., ( CGW) ; “ Mexico, Akapulko , 22.X.1974, leg. C. Wewalka ”, 1 ex., ( CGW) . CUBA: “ Cuba, Isla de La Juventud, Cerro Caudal , 22.v.2006, Y. S. Megna leg.”, 1 ex.; “Cuba, Santiago de Cuba, Dos Bocas, 6.vi.1944, C. T. Ramsden leg.”, 2 exs.; “Cuba, Vista Alegre, 7.viii.1943, C. T. Ramsden leg.”, 1 ex.; “Cuba, Hongolosongo, 22.v.1958, C. T. Ramsden leg.”, 5 exs., “Cuba, Guantánamo, 15.v.1917, C. T. Ramsden leg.”, 1 ex.; “Cuba, Guantánamo, 18.vi.1917; C. T. Ramsden leg.”, 1 ex., (all CZCTR) ; “ Cuba , Guantánamo, S. A. Zimmermann leg.”, 8 exs. ( ZSM) . GUATEMALA: “ Guatemala: Tikal Peten. Ende Mai 1993, Haft leg.”, 1 ex., ( CLH) ; “ Guatemala, Alta Verapaz, San Cristobal , 16.v.1979, Gaigl leg.”, 12 exs., ( ZSM) ; “ S. Jeronimo, Guatemala, Champion”, 1 ex., ( NMW) . COSTA RICA: “ Costa Rica, Guanacaste, Barra Honda National Park, Quebrada La Palma , 12.i.2004, A. E. Z. Short & D. J. Lebbin leg.”, 25 exs. ( CGW, NMW) .

Diagnosis. TL 12.0– 14.4 mm; TL-H = 11.3–13.7 mm; MW 5.7–6.7 mm; pronotum testaceous with a transversal black band posteriorly, in many specimens extending to or almost to anterior margin; elytron with a sublateral marginal stripe usually broad ( Fig. 3C ), sometimes with inward extensions; often with highly developed sub-marginal elytral stripes; protarsomere I without a series of spines across the dorsal surface; metatibia generally with of less than ten bifid setae, curved ventrad basally on posterior surface; median lobe of aedeagus apically truncate in lateral view (see Trémouilles 1996).

Differential diagnosis. Hydaticus rimosus is very similar to H. bimarginatus , but differs from it by the characters given in the identification key, the slightly different coloration of pronotum and elytra. The two species have similar genitalia with narrow parameres, but the median lobe of H. rimosus is more truncate apically, while that of H. bimarginatus is more angulate (see Larson et al. 2000: Figs. 185 k, n).

Distribution. Hydaticus rimosus is found in the Antilles, Mexico, Honduras, and Costa Rica (see Roughley & Pengelly 1981, Miller et al. 2009).

Ecology. Hydaticus rimosus has been collected in temporary habitats with turbid waters, abundant aquatic vegetation and dense accumulation of organic matter. Some specimens were also collected with a light trap.

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.