Hydrometra

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 : 541

Key to the Hydrometra species from Colombia

1 Acetabula of fore and middle legs with 2 pits, or with pits absent ( Fig. 9 a,b)..................................... 2

- All acetabula pitted ( Fig. 10 a–c)......................................................................... 3

2 Clypeus with anterior margin excavated ( Fig. 5 ); abdominal ventrite VII of male lacking spines; body length 11−13 mm ......................................................................................... comata Torre-Bueno

- Clypeus conical ( Fig. 2); abdominal ventrite VII of male bearing two spines ( Fig. 3 ); body length 9.5−12 mm ..................................................................................................... argentina Berg

3 Anteocular portion of the head about 2.5 to 2.6 times as long as the postocular part; clypeus with anteromedial projection rounded or forming an obtuse angle ( Figs. 4, 11)............................................................. 4

- Anteocular portion of the head is about 3.1 to 3. 2 times as long as the postocular part; clypeus with sharply pointed anteromedial projection ( Fig. 8 ); body length 15 mm ....................................... guianana Hungerford and Evans

4 Male abdominal sternites VI and VII both bearing brushes of setae ( Fig. 7 a); clypeus bearing obtuse anteromedial projection ( Fig. 11); body length 18 mm .......................................................... exalla Drake and Lauck

- Male abdominal sternite VI only with brushes of setae, sternite VII lacking such brushes; clypeus bearing rounded anteromedial projection ( Fig. 4); body length 14 mm ............................................. caraiba Guérin-Méneville

Figures

FIGURE 3. Hydrometra argentina male, apical segments of the abdomen, lateral view. Scale 0.10 mm.

FIGURE 5. Hydrometra comata male, clypeus. Scale 0.05 mm (Based on Nieser & Alkins-Koo 1991).

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

FIGURE 8. Hydrometra guianana female, clypeus. Scale 0.05 mm (Based on Nieser & Alkins-Koo 1991).

FIGURE 9. Hydrometra argentina male, acetabular and propleural pits, 9 a fore, 9 b middle. Scale 0.10 mm.

FIGURE 10. Hydrometra exalla male, acetabular and propleural pits, 10 a fore, 10 b middle, 10 c hind. Scale 0.05 mm.