Merobruchus
Creators: name: Manfio, Daiara
name: Ribeiro-Costa, Cibele Stramare
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Chrysomelidae
Merobruchus

description: Merobruchus machadoI sp. nov.
(Figures 19, 35, 39, 43–44, 66, 90, 115, 140)
Material examined. Holotype male deposited in DZUP: (1) “ Brasil –RS, Santa Maria,/ 29°41’S 53°48’W 141m,/ V/2011 D. B. Araldi col.” (2) “Em frutos de/ Parapiptadenia rigida ”. Paratypes. 69 deposited in follow collections: 40 at DZUP, 5 males and 4 females: (1) “ Brasil –RS, Santa Maria,/29˚41’”S 53˚48’”W 141m,/ V/2011 D. B. Araldi col.” (2) “Em frutos de/ Parapiptadenia rigida ”. 2 females and 2 males: (1) “ Brasil –RS–Santa Maria/ 12.IX.2012 J. Garlet” (2) “Larva consumindo sementes de/ Parapiptadenia rigida ”. 1 male: (1) “Porto Alegre, RS/ I. Marinheiros/ 27.X.1998 /L. Moura col.” (2) “Col. MCN/161.140”. 1 male: (1) “JUNDIAÍ DO SUL –PR/Fazenda Monte verde/ BRASIL 03.XII.1986 /Lev. Ent. PROFAUPAR/LÂMPADA”. 1 male and 2 females: (1) “ Brasil –SP–Botucatu Fazenda/Experimental Edgardia–FCA–/ UNESP 22˚48’S 48˚24’W 577m / 29.V.2009 L.M.S. Rodrigues” (2) “Larva consumindo semente de/ Parapiptadenia rigida ”. 8 males and 12 females: (1) “Santa Maria, RS/ 26/V/2012 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 2 females: (1) “Xanxerê, SC/ 25/VI/2013 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 9 at USNM, 1 female and 2 males: (1) “ Brasil –RS–Santa Maria/ 12.IX.2012 J. Garlet” (2) “Larva consumindo sementes de/ Parapiptadenia rigida ”. 1 female at USNM: (1) “ Brasil –SP–Botucatu Fazenda/Experimental Edgardia–FCA–/ UNESP 22˚48’S 48˚24’W 577m / 29.V.2009 L.M.S. Rodrigues” (2) “Larva consumindo semente de/ Parapiptadenia rigida ”. 2 females and 2 males: (1) “Santa Maria, RS/ 26/V/2012 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 1 female: (1) “Xanxerê, SC/ 25/VI/2013 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 6 at TAMU, 1 female: (1) “ Brasil –SP–Botucatu Fazenda/Experimental Edgardia–FCA–/ UNESP 22˚48’S 48˚24’W 577m / 29.V.2009 L.M.S. Rodrigues” (2) “Larva consumindo semente de/ Parapiptadenia rigida ”. 2 females and 2 males: (1) “Santa Maria, RS/ 26/V/2012 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 1 female: (1) “Xanxerê, SC/ 25/VI/2013 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 5 at FSCA, 2 females and 2 males: (1) “Santa Maria, RS/ 26/V/2012 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 1 female: (1) “Xanxerê, SC/ 25/VI/2013 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 4 at MNRJ, 2 females and 2 males: (1) “Santa Maria, RS/ 26/V/2012 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angicovermelho)”. 5 at MZSP 2 females and 2 males: (1) “Santa Maria, RS/ 26/V/2012 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”. 1 female: (1) “Xanxerê, SC/ 25/VI/2013 / Garlet, J. col.” (2) “ Parapiptadenia rigida / (Benth.)/ (Angico-vermelho)”.
Description, holotype. Body length: 2.47 mm; width: 1.48 mm.
Integument. Dorsum: entirely dark brown (Fig. 19). Antenna: antennomeres 1–6 and 11 brown, 7–10 dark brown (Fig. 35). Ventral region: predominantly dark brown, except anterior and middle legs pale brown and brown (Fig. 35). Pygidium: mainly dark brown (Figs 66, 90).
Pubescence. Dorsum: sparse pubescence, yellowish gray and brown not forming conspicuous pattern (Fig. 19); pronotum with pubescence denser on lateral areas than on median region; scutellum white (Fig. 19). Ventral region: mainly yellowish gray; abdominal ventrites uniformly pubescent (Fig. 35). Pygidium: yellowish gray forming sparse median patch and dense longitudinal strip from base to apical third (Fig. 90), interrupted in middle.
Body. Ovate body, widest behind humeri. Head (Fig. 2): without occipital sulcus (Fig. 39); ocular index 3.42; ocular sinus 0.14 mm; postocular lobe very narrow (Fig. 35); frons slightly elevated, inconspicuous frontal carina (Figs 39); frontoclypeal carina present. Antenna: slightly clavate from antennomere 5 (Fig. 35); 6–10 wider than long; 11 subelliptic. Pronotum: lateral margins sinuate in dorsal view (Fig. 19); basal lobe with straight margin; median gibbosity absent (Fig. 19, 35); posterior region without median longitudinal sulcus (Fig. 19); lateral gibbosities absent, only slightly depressed on lateral corners (Fig. 19); coarse punctation all over pronotum (Fig. 19); lateral carina short, reaching at most slightly over half of pronotum length. Scutellum: wider than long (Fig. 19), bidentate. Elytron: humeral gibbosity slightly conspicuous (Figs 4, 19); striae regular in course, visibly impressed, free apically (Fig. 43); striae 3 and 4 with basal denticle near margin of the elytron on slightly elevated gibbosity (Fig. 44); stria 5 without basal denticle (Fig. 44). Mesoventrite: mesoventral process rounded apically (Fig. 47, 48); postmesocoxal sulcus pointed, not following the curvature of the coxa, (Fig. 48). Metaventrite: not protuberant in lateral view (Fig. 35); metanepisternum with coarse punctation moderately distributed; dorsal carina complete, limiting dorsal and posterior margins. Hind leg: femur in lateral view not projects beyond pygidium (Fig. 35); pecten with 4 teeth; internal margin without denticles at anterior region, before pecten. Tibia, external face microserrate (Fig. 3); lateroventral carina complete; mucro shorter than width of tibia apically (Figs 3, 35); coronal tooth present (Fig. 35); curvature of the tibia at external margin reaching half length of tibia. Abdomen: last ventrite, median apical border with strong emargination, with very short lateral projections (Fig. 54). Pygidium: convex in apical 2/ 3 in lateral view; without median lateral tubercles; apical margin truncate.
Male genitalia (based on paratype). Median lobe (Fig. 115): length about 3.5 x the most width at base of ventral valve. Ventral valve subrectangular-arcuate, wider than long and as wide as the apex of median lobe, slightly emarginate at apex. Apical region with dense denticles; a pair of small thornlike sclerites with large base, thin and slightly curved apex. Median region with Y-shaped sclerite, upper stem straight, paired stems straight; a pair of large thornlike sclerites, large base with short and curved apex. Basal region with dense spines and sparse denticles. Basal hood not bilobate, 1.5 x wider than largest width at base of ventral valve. Tegmen (Fig. 140): lateral lobes with moderate emargination reaching over half its length; external margins straight, internal concave; rounded at apex; without projections turned toward the ring.
Paratypes, variability. Body length (n = 10): 2.02–2.71 mm; width: 1.36–1.77 mm.
Integument. Dorsum: brown and dark brown or reddish brown and dark brown. Antenna: sometimes entirely brown or with antennomeres 6–10 dark brown. Ventral region: anterior and middle legs sometimes brown. Pygidium: reddish brown with two median longitudinal dark brown trips.
Pubescence. Pygidium: yellowish gray and white (Fig. 66), dense median longitudinal strip not interrupted in the middle.
Body. Head: ocular index 2.84–3.32; ocular sinus 0.11–0.18 mm (Fig. 2). Pronotum: posterior region with median longitudinal shallow sulcus. Abdomen: female, last ventrite, median apical border with arcuate emargination, with very short lateral projections (Fig. 51). Pygidium: apical 2/3 more strongly convex in female; apical margin rounded in female.
Male genitalia. Median lobe: Apical region, pair of thornlike sclerites with straight apex. Median region, Yshaped sclerite, paired stems slightly curved.
Female. Abdomen: female, last ventrite, median apical border with arcuate emargination, with very short lateral projections (Fig. 51). Pygidium: apical 2/3 more strongly convex; apical margin rounded.
Diagnosis. This species differs from M. paquetae mainly by the colour dark brown of the integument on dorsum (Figs 19, 21) and the apical pair of sclerites in male genitalia (Figs 115, 117–118).
Distribution. Brazil (São Paulo, Paraná, Santa Catarina, Rio Grande do Sul).
Host plant. Fabaceae, Mimosoideae, Mimoseae: Parapiptadenia rigida (Benth.) Brenan. This host plant is for the first time recorded for Bruchinae.
Etymology. The species name is in honor of the 80th Birthday of eminent researcher Prof. Dr. Angelo Barbosa Monteiro Machado, a remarkable Brazilian Odonatologist.
description: Published as part of Manfio, Daiara & Ribeiro-Costa, Cibele Stramare, 2016, A key to American genus Merobruchus Bridwell (Coleoptera: Chrysomelidae: Bruchinae) with descriptions of species and two new host plant records for the subfamily, pp. 284-319 in Zootaxa 4078 (1) on pages 289-291, DOI: 10.11646/zootaxa.4078.1.25, http://zenodo.org/record/263743