Chasmogenus sapucay Fernández, 1986

Clarkson, Bruno & Ferreira-Jr, Nelson, 2014, Four new species and first nominal record of Chasmogenus Sharp, 1882 (Coleoptera: Hydrophilidae) from Brazil, Zootaxa 3765 (5), pp. 481-494 : 492-493

Chasmogenus sapucay Fernández, 1986

(Figs. 18, 19 and 22)

Material examined. PARAGUAY: “ Sapucay , 7-III-1970, leg. Luis Grosso” (1 ex.: MACN, examined by photography, dry material); BRAZIL: Pará State: Santarém Municipality: “Santana do Ituqui, Lago Maicá, - 2,51221o -54,32885o, Luz U.V., 30-IX-2003, de Marco, P. & Ferreira-Jr, N. col.” (1 ex.: DZRJ, Coleoptera 2360 ); “Prainha, Capiranga, Lago Mureru, -2,38959 o -54,08131o, Luz U.V., 02-X-2003, de Marco, P. & Ferreira-Jr, N. col.” (1 ex.: DZRJ, Coleoptera 2314 ); “Prainha, Retiro J.K., Lago J.K., -1,85557o -53,71524o, Luz U.V., 04-X- 2003, de Marco, P. & Ferreira-Jr, N. col.” (2 females: DZRJ, Coleoptera 2315 ); Rio de Janeiro State: Maricá Municipality: “Restinga de Maricá, Poça (aeronáutica), 21.VIII.1996, Ferreira JR, N. col.” (2 ex.: DZRJ, Coleoptera 1474 , 1487).

Diagnosis. Small to Median size species (3.00– 3.75 mm). Head densely punctated. Anterior clypeal margin with wide emargination, with its mesal portion straight, exposing a trapezoidal gap between clypeus and labrum. Anterior margin of labrum slightly concave medially. Anterocentral notch on mentum rounded (Fig. 18 and 19). General dorsal punctures of pronotum and elytra fine, smaller than systematic punctures. Prosternum with slight carina on posterior portion. Mesoventral carina very weak, restricted to posterior half. Hind femora pubescent on basal nine-tenths. Ventrite 5 with shallow apical emargination. Phallobase elongate, manubrium short and distinct. Parameres slightly shorter than median lobe, rounded at apex; inner margin strongly sinuate, outer margins subparallels. Median lobe wide, wider at the base, strongly constrict medially, widening abruptly after this constriction, forming an arrowhead like apical half, apex slightly acuminate. Basal apophyses convex, within parameres (Fig. 22).

Biology. The specimens of C. sapucay deposited in the DZRJ collection were collected with a UV light trap, placed near lakes in the Amazon forest in Pará State, at low altitude; and from ponds, in “restinga” area (Brazilian coastal sand plains), among the vegetation at sea level.

Remarks. The species is widely distributed in South America, occurring in several different biomes in Paraguay and in Brazil, from Northern and Southeastern of the country.