Rheumatobates

Padilla-Gil, Dora N. & Pacheco-Chaves, Bernald, 2012, New records of Rheumatobates Bergroth (Hemiptera: Heteroptera: Gerridae) from the Pacific coast of Colombia and Costa Rica, with a key to males of Rheumatobates in the Eastern Tropical Pacific, Zootaxa 3427, pp. 33-46 : 45

Key to species of males of Rheumatobates from Eastern Tropical Pacific

Modified of Polhemus & Manzano (1992)

1. First antennal segment greatly thickened, expanded distally ( Fig. 6 ). Hind femur articulated to the trochanter on the anterior 1/ 3 ( Fig. 7 )............................................................. R. probolicornis Polhemus & Manzano

- First antennal segment fusiform ( Fig. 9 ) or slightly modified ( Figs. 3 , 12 ). Hind femur articulated directly to trochanter..... 2

2. Abdominal sternites set with brushes of long setae........................................................... 3

- Abdominal sternites set with scattered short setae or lacking setae............................................... 6

3. Abdominal sternites IV −VII or VI −VII set with brushes of long setae; antennal segment III curved but not strongly sinuate, with several rows of stout setae........................................................................... 4

- Abdominal sternites, or only abdominal sternite IV, set with brushes of long setae ( Fig. 11 ); antennal segment III strongly sinuate, with three long stout setae (appearing as a spine) on the basal part ( Fig. 9 ).................................. 5

4 Abdominal sternites IV −VII set with brushes of long setae; abdominal sternite IV produced into a median anteriorly directed tubercle, sternites II −VI medially covering this tubercle ( Fig. 13 )............................... R. prostatus Polhemus

- Only abdominal sternites VI −VII set with brushes of long setae; abdominal sternite IV not produced into an anteriorly directed tubercle, sternites II −VI not medially modified............................................ R. aestuarius Polhemus

5. Only abdominal sternite IV set with brushes of very long setae ( Figs. 8 , 11 )......... R. longisetosus Polhemus & Manzano

- All abdominal sternites set with brushes of long setae.................................. .. R. carvalhoi Drake & Harris

6. Middle femur excavate medially, set with several closely set rows of erect stiff setae; hind leg not modified; abdominal sternites not set with brushes of long setae, two hooks visible ventrally in the apex of abdominal segment VII ( Fig. 14 )................................................................................... R. ornatus Polhemus & Cheng

- Middle femur not excavate medially, set with at most one row of erect setae, hind leg, much modified.................. 7

7. Base of segment antennal II with an expansion ventrally; hind femur strongly widened into a laterally bowed curvature; hind tibia with a longitudinal concavity ( Fig. 12 )................................................. R. bergrothi Meinert

- Base of segment antennal II not expanded ventrally; hind femur not bowed laterally; hind tibia without a longitudinal concav- ity ( Figs. 2−5 ); abdominal sternites with small, semirecumbent setae................ .. R. peculiaris Polhemus & Spangler

Figures

FIGURE 2. Rheumtobates peculiaris, male, habitus (Scale 1 mm)

FIGURES 3 − 4. Rheumtobates peculiaris, male. 3. antenna, ventral view. Scale 0.25 mm. 4. posterior coxae. Scale 0.10 mm.

FIGURE 5. Rheumtobates peculiaris, male, posterior trochanter. Scale 0.10 mm.

FIGURE 6. Rheumtobates probolicornis, male, habitus (Scale 0.5 mm).

FIGURE 7. Rheumtobates probolicornis, male, articulation between hind trochanter and femur. Scale 0.25 mm.

FIGURES 11. Rheumtobates longisetosus, male, lateral view of abdomen. Scale 0.25 mm

FIGURE 12. Rheumtobates bergrothi, male, habitus (Scale 1 mm).

FIGURE 13. Rheumtobates prostatus, male, habitus (Scale 1 mm).

FIGURE 14. Rheumtobates ornatus, male, habitus (Scale 1 mm).

FIGURES 8 − 10. Rheumtobates longisetosus, male. 8. habitus (Scale 1 mm). 9. antenna, lateral view. Scale 0.25 mm. 10. fore leg, dorsal view. Scale 0.25 mm.