Buenoa uselus, Padilla-Gil, Dora N., 2010

Padilla-Gil, Dora N., 2010, A new species of Buenoa (Hemiptera: Heteroptera: Notonectidae) from the Pacific coast of Colombia, with a key to males of notonectids of Colombia, Zootaxa 2622, pp. 61-64 : 61-62

Buenoa uselus sp. n.

Type material. HOLOTYPE, macr M, allotype macr F: COLOMBIA, Nariño, Tumaco, Finca Mar Agrícola, Universidad de Nariño, 0–3 m, in a pond, 22 June 2010, leg. D. Padilla, ( ICN). PARATYPES, same data as holotype, of these the following have been distributed: 1 brach M, 1 brach F ( ICN), 1 macr M, 1 macr F (PSO-CZ).

Description. Macropterous form. Dimensions. Length M 7.60−7.86, F 7.60−7.70; greatest body width M 1.88; F 2.16. Brachypterous form, length M 7.0, F 6.9; greatest body width M 1.76; F 2.08. Width of head M (all) and F macr, 1.62, F brach 1.56.

Color. General body bright white, dark eyes. Pleura, inner margin with a fringe of short and black hair. Abdominal venter black except keel and portions of connexivum, these yellow; abdominal dorsum red with irregular areas of black and black apex. Along median longitudinal axis of head, pronotum, and hemelytra covered with thin, long, transparent setae. Membrane, however, not covered.

Male structural characteristics: As viewed from above, outline of head rounded with anterior margin of vertex continuous with that of eyes. Also, vertex slightly indented. Width of head 4.7 times anterior width of vertex (1.62/0.34) and smaller than humeral width of pronotum; synthlipsis 1.8 times anterior width of vertex (0.18/0.34); along median longitudinal axis, head is 2.2 times shorter than that of pronotum; tylus inflated, and with thin, long, transparent setae; labrum’s width twice its length, displaying a tuft of transparent, hair, and a truncate apex; rostral prong ( Fig. 1 ) longer than third rostral segment, with base originating laterally and protruding anteriorly at distal end of third rostral segment, rounded apex. Pronotum tricarinate; lateral margins slightly divergent; posterior margin convex, medially concave; median length 1.3 times its width (1.72/1.3). Scutellum short, pronotum with median length 1.6 times median length of scutellum. Fore femur wide, somewhat thickened basally and slightly thinner apically ( Fig. 2 ); stridulatory area with 17– 20 weak ridges, with apical small and irregular teeth ( Fig. 3 ); dorsal and ventral to stridulatory area with parallel striae visible. Fore tibia with stridulatory comb consisting of approximately 40 teeth ( Fig. 4 ), with 10 long basal teeth, followed by ~30 shorter teeth. Fore and middle legs have dark preapical structure in tarsus II ( Fig. 5 ). Dorsal apex of middle tibia with two rows of four transparent setae ( Fig. 6 ). Male genital claspers normal. Spine from caudo-sinistral margin curved and very narrow 2/3 apically.

Female structural characteristics: female has the setae characteristic of the middle tibiae and the preapical structure in tarsus II. Also, hind femur has 25 spines along posterior margin.

Etymology: Uselus . A Greek noun meaning “lofty.”

Comparative notes: B. uselus is similar to B. platycnemis (Fieber) , but B. platycnemis is smaller (length M 4.6−5.7, F 4.9−5.1), its measures morphometric are different, the fore femur has 11–14 sclerotized ridges and it also lacks the preapical structure in the anterior and middle tarsus II. B. uselus , male and female have long setae on the outer surface of the middle tibia at the apex ( Fig. 6 ).

Habitat. The specimens were collected from a permanent lake of more than a meter deep, with surrounding vegetation and open waters; tropical humid forest encompasses the lake. The habitat is characterized by air temperature 32 ºC, water temperature 26 ºC, pH 7, conductivity 621 S/m, and dissolved oxygen 50%.

B. uselus sp. n. is found with Microvelia pulchella Westwood, 1834 , Microvelia longipes Uhler, 1894 , and Trepobates taylori (Kirkaldy, 1899) ; in another lake with Limnogonus aduncus Drake & Harris, 1933 , Limnogonus franciscanus (Stål, 1859) , and Microvelia longipes .

Figures

FIGURES 1 − 6. Buenoa uselus sp. n. male. 1 Rostrum in lateral view; 2 Fore leg; 3 Femoral comb (400 X); 4 Tibial comb (400 X); 5 Preapical structure of fore tarsus II; 6 Dorsal apex of middle tibia.