Notonectidae Latreille 1802

Key to genera and species of Notonectidae from Pará (adapted from Barbosa et al. 2013a, 2013b; Moreira et al. 2018) 1a. Hemelytral commissure without setae-lined pit (Fig. 14A); male protibia without stridulatory comb; abdominal tergum 7 caudosinistral margin without spine....................................................................... 2 1b. Hemelytral commissure anteriorly with setae-lined pit (Fig. 26A); male protibia with stridulatory comb (Figs. 26G, 27A); abdominal tergum 7 caudosinistral margin with spine (Fig. 26B) (Buenoa Kirkaldy, 1904)........................... 3 2a (1a). Eyes contiguous posteromesally (Fig. 15A); clavus distal end with spine-like process (hemelytral process) (Figs. 16A–B, 17A–B, 18B–C, 19B–C, 20B, 21A–C, 22A, 23C–D, 24A–B); mesofemur without preapical spur (Martarega White, 1879).................................................................................................... 17 2b. Eyes separated (Fig. 14A); clavus distal end without spine-like process (Fig. 14A); mesofemur with preapical spur (Notonecta Linnaeus, 1758)..................................................................................... 25 3a (1b). Profemur without stridulatory area on mesal surface (Fig. 27A)................................................ 4 3b. Profemur with stridulatory area on mesal surface (Fig. 26G).................................................. 14 4a (3a). Mesal margin of protibia with apex projected (Fig. 26E)...................................................... 5 4b. Mesal margin of protibia with apex not projected (Fig. 26H)................................................... 7 5a (4a). Apex of mesal margin of protibia bluntly projected (Figs. 27A, 28A); lateral margin of mesotibia with lateral expansion (Fig. 27C); metafemur sinuous (Fig. 27D)...................................................................... 6 5b. Apex of mesal margin of protibia acute (Figs. 35A); lateral margin of mesotibia without expansion; metafemur not sinuous.............................................................................. Buenoa truxali Nieser, 1968 6a (5a). Tylus flat, pubescent (Fig. 27E); apex of right paramere straight (Fig. 27F).................................................................................................... Buenoa deplanatylus Barbosa & Nessimian, 2013 6b. Tylus rounded, glabrous (Fig. 28B); apex of right paramere rounded (Fig. 28C).............. Buenoa tibialis Truxal, 1957 7a (4b). Tylus inflated or, if not inflated, rounded and without lateral carinae (Figs. 33A, 34A, 38A,39A, 40A, 41A); protarsus tubular, thin, with claws not modified........................................................................... 8 7b. Tylus flat, with two lateral carinae (Fig. 36A); protarsus, notably basal segment, swollen, claws hooked (Fig. 36B)..................................................................................... Buenoa unguis Truxal, 1953 8a (7a). Synthlipsis narrow, one-fourth or less of anterior width of vertex; protrochanter without process on posterior margin; mesal margin of mesotibia not enlarged........................................................................ 9 8b. Synthlipsis wide, about one-half of anterior width of vertex; protrochanter with process on posterior margin (Fig. 37A); mesal margin of mesotibia enlarged (Fig. 37B)......................................... Buenoa fuscipennis (Berg, 1879) 9a (8a). Synthlipsis flat, without median keel; pronotum not impressed................................................ 10 9b. Synthlipsis with faint median keel; pronotum tricarinate.............................. Buenoa incompta Truxal, 1953 10a (9a). Synthlipsis very narrow, about one tenth of vertex width (Fig. 33A, 34A, 40A, 41A); without dark mark at costal margin of hemelytra; apex of profemur narrow (Fig. 33B, 34b, 40B, 41B)................................................ 11 10b. Synthlipsis wider, about one-fourth of vertex width (Fig. 39A); dark mark accompanying the costal margin of hemelytra and delimiting start of membrane; apex of profemur broad (Fig. 39B).................... Buenoa konta Nieser & Pelli, 1994 11a (10a). Body distinctly longer than 5.0 mm; frons narrow (Fig. 26C); apex of labial prong rounded (Figs. 33A, 34A, 41A)..... 12 11b. Body at most 4.0 mm long; frons wide (Fig. 26D); apex of labial prong sinuous (Fig. 40A).. Buenoa salutis Kirkaldy, 1904 12a (11a). Mesal surface of profemur not notched (Fig. 33B, 34B)................................................... 13 12b. Mesal surface of profemur notched apically (Fig. 41B)........................... Buenoa amnigenopsis Nieser, 1975 13a (12a). Labrum with tufts of setae on sides (Fig. 33A); protrochanter without projection on mesal surface; apex of profemur narrow (Fig. 33B); stridulatory comb of protibia with 24–30 teeth of similar size............... Buenoa amnigenus (White, 1879) 13b. Labrum with tufts of setae on ventral surface (Fig. 34A); protrochanter with triangular projection on mesal surface (Fig. 34B); apex of profemur robust; stridulatory comb of protibia with 20–22 teeth narrow at the base and widening toward apex............................................................................. Buenoa amnigenoidea Nieser, 1970 14a (3b). Labial prong originating distally on third labial article; tarsomere I of midleg with mesal margin continuous.......... 15 14b. Labial prong originating proximally on third labial article (Fig. 31A); tarsomere I of midleg with mesal margin distinctly emarginate (Fig. 31C).......................................................... Buenoa tarsalis Truxal, 1953 15a (14a). Pronotum tricarinate; stridulatory area of profemur with 11–23 ridges........................................ 16 15b. Pronotum not tricarinate; stridulatory area of profemur with less than 11 ridges (Fig. 32B).................................................................................................... Buenoa macrotrichia Truxal, 1953 16a (15a). Labial prong protruding anteriorly at base (Figs. 29A); pronotum length about 2.5 times head length; posterior margin of pronotum not or slightly excavated; profemur with 11–14 stridulatory ridges (Fig. 29B)...................................................................................................... Buenoa platycnemis (Fieber, 1851) 16b. Labial prong not protruding at base (Fig. 30A); pronotum length about 3 times head length; posterior margin of pronotum distinctly excavated; profemur with about 17 stridulatory ridges (Fig. 30B)............ Buenoa pallipes (Fabricius, 1803) 17a (2a). Males shorter than 4.3 mm; females shorter than 4.8 mm; hemelytron of both sexes with median stripe bifurcated near apex (Figs. 16A–B, 17A–B); ventral carina with setae on anteroventral and lateral surfaces (Fig.18D)..................... 18 17b. Males longer than 4.7 mm; females longer than 5.6 mm; hemelytron of both sexes with median stripe not bifurcated near apex or with stripe not located medially (Figs. 18B–C, 19B–C, 20B, 21A–B, 22A, 23C–D, 24A–B); ventral carina with setae only on lateral surface.................................................................................... 19 18a. (17a) Hemelytral process extending to apex of membrane in both sexes (16A–B); ventral surface of male mesotrochanter without group of ensiform setae.................................................. Martarega membranacea White, 1879 18b. Hemelytral process not extending to apex of membrane in both sexes (17A–B); ventral surface of male mesotrochanter with central group of ensiform setae (Fig. 17C–D)....................................... Martarega chinai Hynes, 1948 19a. (17b) Lateral margin of metatrochanter with apex truncate (Fig. 19A)............................................. 20 19b. Lateral margin of metatrochanter with apex not truncate (Fig. 20C)............................................ 22 20a. (19a) Male mesotrochanter with group of ensiform setae near lateral margin (19A); female abdomen constricted at posterior half (Figs. 18D)......................................................................................... 21 20b. Male mesotrochanter without group of ensiform setae (18A); female abdomen not constricted............................................................................................... Martarega hungerfordi Truxal, 1949 21a. (20a) Lateral margin of mesotrochanter without process in both sexes (18A); male mesofemur with only a few setae (18A); median stripe of female hemelytron with concavity at posterior margin (18C)........................................................................................ Martarega oriximinaensis Barbosa, Ribeiro & Ferreira Keppler, 2010 21b. Lateral margin of male mesotrochanter with rounded process (19A); lateral margin of male mesofemur distinctly setose (19A); median stripe of female hemelytron with parallel margins (Fig. 19C).. Martarega siolii Barbosa, Nessimian & Takiya, 2015 22a. (19b) Hemelytron mostly hyaline, with opaque stripes (21A–B, 22A); no sexual dimorphism on hemelytral stripes shape (21A– B, 22A); male mesotrochanter with small groups of ensiform setae on lateral margin (Fig. 21D); macropterous hemelytron brown............................................................................................. 23 22b. Hemelytron mostly opaque, with hyaline stripes (24C–D, 25A–B); sexual dimorphism on hemelytral stripes shape (24C–D, 25A–B); male mesotrochanter with thin setae centrally on ventral surface (Fig. 24B, 25C); macropterous hemelytron yellow................................................................................................... 24 23a. (22a) Hemelytron with a single opaque stripe along costal margin (Fig. 22A–B); male mesotrochanter with 3–4 groups of ensiform setae on lateral margin (Fig. 22D); left paramere three times as long as wide (Fig.22E)... Martarega gonostyla Truxal, 1949 23b. Hemelytron with short opaque stripe at basal third medially