Hydrometra exalla Drake and Lauck, 1959

Padilla-Gil, Dora N., 2013, A review of the species of Hydrometra Latreille occurring in Colombia, with a key to species and distribution map (Hemiptera: Heteroptera: Hydrometridae), Zootaxa 3686 (5), pp. 534-542 : 537

Hydrometra exalla Drake and Lauck, 1959

Material examined. COLOMBIA, Nariño, Tumaco, Mar Agrícola, Lake 3, 1º41’14” N, 78º44’16” W, 10 m, 17 XI 2010, 1 male macr, D. N. Padilla, leg.; same data as preceding, Lake 7, 22 VI 2010, 1 female macr, (PSO- CZ).

Description. Macropterous female. BL 20.8; body width across mesocoxa 1.12, across metacoxa 1.2; AO /PO 3.34/1.32; Ant, I–IV: 0.80, 1.76; 6.66; 2.33; wing length 7.23; LA 8.40.

General dorsal coloration brown, venter pale yellow. Acetabular pits: fore leg with 7 in episternum and 10 in epimeron; middle leg with 8 in episternum and 10 in epimeron; hind acetabulum with 15 pits. Apical segment of abdomen ending in a narrow, acutely pointed triangular process ( Figs. 6 a,b), abdominal ventrites VI and VII lacking brushes or other structures ( Fig. 6 c).

Comparative notes with the male. The female is distinctly larger than the male (BL 18 mm), differs slightly in the length of the antennae (male Ant, I–IV: 0.70, 1.84, 6.6, 2.36) and has differently formed terminal abdominal segments both dorsally and ventrally ( Figs. 7 a,b).

Distribution in Colombia ( Fig. 1 ): Nariño: Tumaco, Mar Agrícola, 10 m (pac).

Distribution in America: Colombia. Perú: Department Huánuco, Luyando District, Santa Rosa Shapajilla ( Drake & Lauck, 1959).

Figures

FIGURE 1. Distribution of Hydrometra species from Colombia. Black circle: H. caraiba; triangle: H. argentina; square: H. comata; white circle: H. guianana; pentagon: H. exalla. Departments of Colombia: 1 Atlántico, 2 Magdalena, 3 Cesar, 4 Antioquia, 5 Quindío, 6 Cundinamarca, 7 Meta, 8 Valle del Cauca, 9 Nariño.

FIGURE 6. Hydrometra exalla female, apical segments of the abdomen, 2 a ventro-lateral view; 2 b dorsal view; 2 c ventral view. Scale 0.10 mm.

FIGURE 7. Hydrometra exalla male, apical segments of the abdomen, 3 a ventral view; 3 b dorsal view. Scale 0.10 mm.