Tachygerris tucanensis, Morales-C, Irina T. & Castro-Vargas, Maria I., 2013

Morales-C, Irina T. & Castro-Vargas, Maria I., 2013, A new species and new records of Tachygerris Drake, 1957 (Hemiptera: Heteroptera: Gerridae) from Colombia, Zootaxa 3616 (3), pp. 277-283 : 278

Tachygerris tucanensis sp. nov.

Examined material. Holotype: 1 3 macropterous ( Figure 1 a). COLOMBIA, Vaupés: Mitú, Comunidad Indigena Acaricuara, tributario caño Paca, 16-XI-2008, R. Pedroza leg. (UPTC-MHN-ART 0008).

Paratypes: 5 3 macropterous 5 Ƥ macropterous. Vaupés: Mitú, Comunidad Indigena Acaricuara, tributario caño Paca, 16-XI-2008, R. Pedroza leg (UPTC-MHN-ART 0009).1 3 macropterous 3 Ƥ macropterous. Vaupés: Mitú, Comunidad Indigena Acaricuara, tributario caño Paca, 16-XI-2008, R. Pedroza leg. (DZRJ-3605).

Description of macropterous male (holotype): Measurements: Total length 5.93, maximum width 1.85. Head length 0.75, head width 1.19; lengths of antennomeres (I, II, III, IV): 1.18, -, -, -; body length 5.93; body width 1.85; pronotum width at humeri 1.3, pronotum length 2.51; length of leg segments: fore femur/tibia/tarsus I+II: 2.06, 1.52, 0.22+0.26; middle femur/tibia/tarsus I+II: 4.6, 4.15, -,-; hind femur/tibia/tarsus I+II: 4.62, 1.78, 0.48+0.27.

Color and pilosity. Head light brown, with brown stripes on lateral margins of eye. Pronotum light brown, anterior lobe with longitudinal median line whitish; posterior lobe with dark brown stripe, covered with fine gold setae; propleural region with a brown stripe, followed by median line whitish. Wings brown; sides and sternites mainly pale yellow. Antennae and legs dark yellow. Meso- and meta-acetabulae with strongly shining silvery spots.

Structural characteristics. Rostrum reaching middle of mesosternum. Pronotum clearly widened at level of humeral angles, with sharp posterior margin. Fore and hind femur slightly curved, the middle with long apical spine. Fore femur with small knob covered by short setae ( Figure 1 b). Sternite VII subquadrate, as long as sum of the two preceding; sternite VIII with caudal margin slightly produced medially. Pygophore ( Figure 2 a): broad with boat-shaped and dorsolateral margin with tooth. Proctiger ( Figure 2 b): slender heart-shaped, slightly rounded towards apex, with some erect and rather short setae on sides. Vesica ( Figure 2 c): dorsal sclerite forming a short bow, ventroapically split into two subparallel arms, apex with small spines. Ventral sclerite absent, lateral sclerites very long and slender.

Description of macropterous female (allotype): Total length, 7.67, maximum width 2.26. head length 0.90, head width 1.33; lengths of antennomeres (I, II, III, IV): 1.34, 1.0, 1.8, 2.69; body length 7.67; body width 2.26; pronotum width at humeri 1.61, pronotum length 3.0; length of leg segments: fore femur/tibia/tarsus I+II: 2.12, 1.80, 0.33+0.39; middle femur/tibia/tarsus I+II: 5.8, 4.2, 2.48, 0.45,- + -; hind femur/tibia/tarsus I+II: 5.65, 2.0, 0.39+0.24.

Color and pilosity as in male.

Structural characteristics. Fore and hind femur slightly curved at base. Mesosternal central channel and metasternal carina slightly pronounced. Sternite VIII with short triangular connexival spines. Margin of last abdominal sternite protruding, slightly exceeding connexival spines, and with three small lobes on apical margin ( Figure 3 ).

Distribution in Colombia: Restricted to region of Amazonas, department of Vaupés.

Comparative notes: This species resembles members of T. adamsoni ( Drake, 1940) . The male of T. tucanensis sp.nov. has a small knob covered by short setae on the ventral margin of the fore femur, which easily distinguishes these two species from other congeners. The male of T. tucanensis sp. nov. differs from T. adamsoni in the broad and boat-shaped pygophore, and the slender heart-shaped proctiger. The female has short connexival spines and the margin of the last abdominal sternite protruding, slightly exceeding connexival spines, and with three small lobes on her apical margin. In T. adamsoni , the margin is faintly convex at the middle and the connexival spines are rather long.

Etymology. The term tucanensis refers to Indian community (Tucanos) living on the region where the typeseries was collected.

Figures

FIGURE 1. Tachygerris tucanensis sp. nov. a. Dorsal view of male. b. Fore femur of male.

FIGURE 2. Male genitalia of Tachygerris tucanensis sp. nov. a. Lateral aspect of pygophore. b. Proctiger. C. Vesica sclerites of male, ds—dorsal sclerite, ls – lateral sclerite.

FIGURE 3. Ventral view of last abdominal segments of female of Tachygerris tucanensis sp. nov.