A key to American genus Merobruchus Bridwell (Coleoptera: Chrysomelidae: Bruchinae) with descriptions of species and two new host plant records for the subfamily Author Manfio, Daiara Author Ribeiro-Costa, Cibele Stramare text Zootaxa 2016 4078 1 284 319 journal article 46790 10.11646/zootaxa.4078.1.25 e94a2297-93a5-4d20-b957-670b655f214e 1175-5326 263743 78037DEE-A4F0-4E28-8135-EFD57552C3D0 Key to species of Merobruchus 1. Elytron, striae 3–4 without basal gibbosity ( Fig. 1 ); mesoventrite, postmesocoxal sulcus rounded, following the curvature of the coxa ( Fig. 47 )..................................................................................... 2 1’. Elytron, striae 3–4 with basal gibbosity slightly to moderately elevated; mesoventrite, postmesocoxal sulcus almost always pointed, not following the curvature of the coxa ( Fig. 48 )...................................................... 5 2(1). Head, postocular lobe long ( Fig. 4 )........................................................................ 3 2’. Head, postocular lobe short ( Fig. 35 ) to moderate ( Figs 36–37 )................................................. 4 3(2). Elytron, striae at base without denticles ( Fig. 9 )......................................................................................... M. bicoloripes ( Pic, 1927 ) ( Mimosoideae : Ingeae ; Figs 4 , 9 , 34 , 38 , 41–42, 46 , 81 , 105 , 131 ) 3’. Elytron, striae 3–6 at base with denticles ( Fig. 20 )..................................................................................................... M. major (Fall, 1912) ( Mimosoideae : Ingeae ; Figs 20 , 47 , 67 , 91 , 116 , 141 ) 4(2’). Elytron, striae 6 and 7 joined basally by carinate loop, integument entirely brown to dark brown ( Fig. 12 )................................................ M. columbinus (Sharp, 1885) ( Mimosoideae : Ingeae ; Figs 1–2 , 12 , 59 , 84 , 108 , 134 ) 4’. Elytron, striae 6 and 7 free basally, integument bicoloured, anterior half brown and posterior half dark brown ( Fig. 22 )........................................ M. pickeli ( Pic, 1927 ) ( Mimosoideae : Ingeae ; Figs 22 , 40 , 45–46 , 69 , 93 , 119 , 143 ) 5(1’). Elytron, interstria 3 at median region with a conspicuous dense golden or yellowish elongated strip of pubescence ( Figs 30, 31 ); pronotum, lateral areas always with dense pubescence, differing from the disc ( Figs 30, 31 )....................... 6 5’. Elytra, interstria 3 at median region in general without a conspicuous golden or yellowish strip ( Figs 11, 14 , 27 ); when strip present, pronotum entirely and densely pubescent or pubescence sparse, lateral areas in general not differing from the disk ( Figs 13, 15 )......................................................................................... 8 6(5). Dorsum, integument mostly brown to reddish brown ( Fig. 30 ); male genitalia, median lobe, internal sac with only one median sclerite ( Fig. 127 ).............. M . terani Kingsolver, 1980 ( Mimosoideae : Acacieae , Ingeae ; Fig. 30 , 77 , 101 , 127 , 151 ) 6’. Dorsum, integument mostly darker, reddish brown to dark brown ( Figs 24 , 31 ); male genitalia, median lobe, internal sac with one median sclerite and a pair of sclerites below ( Figs 121 , 128 )................................................ 7 7(6’). Abdomen, first and second ventrites each with lateral glabrous polished spot ( Fig. 37 ).................................................... M. politus Kingsolver, 1988 ( Mimosoideae : Acacieae , Ingeae , Mimoseae ; Figs 24 , 37 , 95 , 121 , 145 ) 7’. Abdomen, ventrites lacking lateral glabrous polished spots ( Figs 35–36 ).......................................................... M. triacanthus Kingsolver, 1988 ( Mimosoideae : Acacieae , Ingeae , Mimoseae ; Figs 31 , 78 , 102 , 128 , 152 ) 8(5’). Elytron, external median region with conspicuous dark brown macula ( Fig. 27 )............................................................... M. santarosae Kingsolver, 1980 ( Mimosoideae : Acacieae , Ingeae ; Figs 26 , 73 , 97 , 123 , 147 ). 8’. Elytron without conspicuous macula ( Figs 10, 16, 17 , 32 )...................................................... 9 9(8’). Pronotum with median, narrow, strongly contrasting, yellowish gray strip of pubescence ( Fig. 17 ); elytron, interstriae 2 and 3 with dense pubescence ( Fig. 17 ); interstriae 4–8 with oblique stripe from median to submedian region at posterior half of elytron ( Fig. 17 )................................................. M. lineaticollis (Sharp, 1885) ( Fig. 17 , 64 , 113 ) 9’. Pronotum and elytron with other pubescence pattern ( Figs 13 , 33 ) or lacking a conspicuous pattern ( Fig. 29 )............ 10 10(9’). Head, frontal carina in general conspicuous ( Figs 2 , 38, 40 ), when inconspicuous, dorsum with sparse white pubescence, usually contrasting with the dark integument, not forming a conspicuous pattern ( Fig. 25 ); male genitalia, apex of the median lobe (largest width)as wide as or almost as wide as the basal hood ( Figs 112 , 122 , 130 )................................. 11 10’. Head, frontal carina in general inconspicuous ( Fig. 39 ), when conspicuous very thin; dorsum with yellowish gray or yellowish pubescence forming or not a conspicuous mottled pattern ( Figs 11, 13 ); male genitalia, apex of the median lobe (largest width) always narrower than the basal hood ( Figs 109 , 117 )......................................................... 16 11(10). Dorsum, except pygidium , with sparse white pubescence, usually contrasting with the dark integument, not forming a conspicuous pattern ( Figs 25 , 32 ); scutellum in general yellowish ( Fig. 25 )............................................. 12 11’. Dorsum mostly white, yellowish gray or yellowish, pronotum with white, yellowish gray or yellowish dense pubescence at least laterally, elytron with or without conspicuous pubescence pattern, never completely sparse ( Figs 16 , 33 )........... 13 12(11). Male genitalia short, with a large Y-shaped sclerite and a pair of small sclerites ( Fig. 129 )............................................................ M. vacillator (Sharp, 1885) ( Mimosoideae : Ingeae ; Figs 32 , 50, 53 , 79 , 103 , 129 , 153 ) 12’. Male genitalia elongate, only with a large Y-shaped sclerite ( Fig. 122 )............................................................................... M. porphyreus Kingsolver, 1988 ( Mimosoideae : Ingeae ; Figs 25 , 72 , 96 , 122 , 146 ) 13(11’). Pygidium sexually dimorphic, female with a large heart-shaped almost denuded spot ( Fig. 88 ), male completely pubescent, not mottled ( Fig. 63 ); male genitalia, median lobe with skewed Y-shaped sclerite ( Fig. 112 )..................................................................... M. knulli (White, 1941) ( Mimosoideae : Ingeae ; Figs 16 , 63 , 88 , 112 , 136 ) 13’. Pygidium not sexually dimorphic, female ( Fig. 104 ) and male ( Fig. 80 ) pygidium completely pubescent; male genitalia, median lobe with flat Y-shaped sclerite or without Y-shaped sclerite ( Fig. 130 ).................................... 14 14(13’). Dorsum with mottled stripes pattern ( Figs 10, 15 ).......................................................... 15 14’. Dorsum, except posterior region of elytra clothed by dense, uniform yellowish pubescence ( Fig. 33 )..................................................... M. xanthopygus Kingsolver, 1988 ( Mimosoideae : Ingeae ; Figs 33 , 80 , 104 , 130 , 154 ) 15(14). Female, last abdominal ventrite, median apical border with long projections forming digitate process ( Fig. 5 ); male with short projections ( Fig. 6 )........................................................................................... M. boucheri Kingsolver, 1980 ( Mimosoideae : Acacieae , Ingeae , Mimoseae ; Figs 5–6, 8 , 10 , 52 , 55, 57 , 82 , 106 , 132 ) 15’. Female, last abdominal ventrite, median apical border with very short projections ( Fig. 51 ); male without projections ( Fig. 53 )...................... M. julianus (Horn, 1894) ( Mimosoideae : Acacieae , Ingeae , Mimoseae ; Figs 15 , 62 , 87 , 111 , 137 ) 16(10’). Elytron, striae 3–5 with denticles; female, last abdominal ventrite, median apical border with long projections forming digitate process ( Fig. 5 )................. M. santiagoi Ribeiro-Costa, 2007 ( Mimosoideae : Ingeae ; Figs 27 , 74 , 98 , 124 , 148 ) 16’. Elytron, striae 3–4 with denticles; female, last abdominal ventrite, median apical border with short to very short projections ( Fig. 51 )............................................................................................ 17 17(16’). Elytron with very conspicuous mottled stripes pattern formed by dense pubescence ( Figs 13 , 21 )..................... 18 17’. Elytron without conspicuous mottled stripes pattern, in general, sparser pubescence ( Figs 18–19 )..................... 19 18(17). Female, pygidium truncate at apex ( Fig. 85 ); male genitalia, median lobe, internal sac with a small Y-shaped sclerite medially ( Fig. 109 )............................ M . hastatus Kingsolver, 1980 ( Mimosoideae : Ingeae ; Figs 13 , 60 , 85 , 109 , 135 ) 18’. Female, pygidium rounded at apex ( Fig. 92 ); male genitalia, median lobe, internal sac with a large Y-shaped sclerite medially ( Figs 117–118 )......................................................................................... M . paquetae Kingsolver, 1980 ( Mimosoideae : Ingeae , Mimoseae ; Caesalpinioideae : Caesalpinieae : Pterogyne nitens Tul. new record ; Figs 3, 7 , 21 , 48–49, 54 , 68 , 92 , 117–118 , 142 ) 19(17’). Head, antenna pale brown; elytron visibly bicoloured, posterior region darker................................................................. M. lysilomae Kingsolver, 1988 ( Mimosoideae : Acacieae , Ingeae ; Figs 18 , 65 , 89 , 114 , 139 ) 19’. Head, antenna in general with antennomeres 8–10 darker; elytron not bicolored or not visibly bicoloured like above...... 20 20(19). Male genitalia, median lobe, ventral valve much longer than wide ( Fig. 107 )...................................................................... M. chetumalae Kingsolver, 1988 ( Mimosoideae : Ingeae ; Figs 11 , 51 , 58 , 83 , 107 , 133 ) 20’. Male genitalia, median lobe, ventral valve wider than long ( Figs 109 , 117 , 127 )................................... 21 21(20’). Dorsum, integument reddish brown or dark brown, pubescence always sparse............................................. M. machadoi sp. nov. Manfio & Ribeiro-Costa ( Mimosoideae : Mimoseae ; Figs 19 , 35, 39 , 43–44 , 66 , 90 , 115 , 140 ) 21’. Dorsum, integument mostly brown ( Figs 14 , 18 , 29 )......................................................... 22 22(21’). Pygidium with narrow median basal stripe or triangle of white dense pubescence strongly conspicuous ( Figs 61 , 76 , 86 , 100 )................................................................................................... 23 22’. Pygidium without median basal stripe or triangle of white dense pubescence ( Figs 75 , 94 ); when present, inconspicuous ( Fig. 70 )................................................................................................ 24 23(22). Pronotum, integument with patchy dark brown areas ( Fig. 14 ); elytron, lateral margins, integument suffused with dark brown ( Fig. 14 ); pygidium with narrow median strip of white pubescence in general reaching almost the apex ( Figs 61 , 86 ); male genitalia, median lobe, ventral valve arcuate with distinct apical nipple ( Fig. 110 )..................................................................... M. insolitus (Sharp, 1885) ( Mimosoideae : Acacieae , Ingeae ; Figs 14 , 61 , 86 , 110 , 136 ) 23’. Dorsum, integument with unique conspicuous colour ( Fig. 29 ); pygidium with basal triangle and median spot of white dense pubescence ( Figs 76 , 100 ); male genitalia, median lobe, ventral valve subrectangulate ( Fig. 126 )................................................. M. sonorensis Kingsolver, 1980 ( Mimosoideae : Acacieae , Ingeae ; Figs 29 , 76 , 100 , 126 , 150 ) 24(22’). Elytral pattern slightly mottled (Fig, 23); male genitalia, internal sac, base of the median sclerite broad ( Fig. 120 )............................... M. placidus (Horn, 1873) ( Mimosoideae : Acacieae , Ingeae , Mimoseae ; Figs 23 , 70 , 94 , 120 , 144 ) 24’. Elytral pattern strongly mottled ( Fig. 26 ); male genitalia, internal sac, base of the median sclerite slender ( Fig. 125 )............................................ M. solitarius (Sharp, 1885) ( Mimosoideae : Acacieae ; Figs 28 , 75 , 99 , 125 , 149 )