Tibraca exigua, Fernandes & Grazia, 1998

Fernandes, José Antonio Marin & Grazia, Jocélia, 1998, Revision of the genus Tibraca Stål (Heteroptera, Pentatomidae, Pentatominae), Revista Brasileira de Zoologia 15 (4), pp. 1049-1060 : 1057

Tíbraca exígua sp.n.

Figs 5,6, 12,14, 15, 20, 21,26, 27,29

Male. Very similar to T limbativentris but smaller in size. Body length from 9.0- 12.0. Length of head 2.1 -2.4; anteocular length 1.2- 1.4; width ofhead 1.9-2.2; width between eyes 1.1- 1.4; anteocular width 0.9- 1.0. Pronotal length 2.0-2.7; pronotal width 5.2-6.0. Scutellar length 3.3-4.4; basal width 3.2-3.9. Abdominal width 0.54-0.65. Pronotai lateral margins impunctated 01' rarely punctated at posterior half. Ostiolar ruga shorter than in the previous species, as long as or slightly larger than opening of scent gland, developed 1/6 through metapleural width. Legs red to dark red. Abdominal area belween trichobothria and lateral margin yellowish with sparse and castaneous punctures, occasionally absent. Basal processes of proctiger in a posteriorly directed horn-like projection ( Fig. 5 ). Processus conjunctivae 1digitiform and dorsally curved at apex, in profile ( Fig. 27 ). Other characters as described for genus.

Female. Similar to male. Duclus receplaculi, before vesicular area, conspicuously longer than in the previous species, exceeding ten times the length of this area; ductus equal in diameter before and after vesicular area ( Fig. 29 ).

Type material. Holotype male: ARGENTINA, Entre Rios: Pronuntiamente, 1-1965, F.H. Walz, Museum Leiden. ( RMNH) . Paratypes: BRAZIL, Santa Catarina: 10invile , Coleção Diringshofen, 1female ( UFRG); 1 female, # 060; 1 female, # 061. ( MZSP) . Corupá, Hansa Humboldt, A. Maller, Frank Johnson Donor Collection, I female, XI- 1919, Tibraca simulans H. Ruckes (not described), Tibraca ruckesi McDonald (not described) ; 1 male, XlI- 1944, Tibraca simulans H. Ruckes (not described), Tibraca I'I/ckesi McDonald (nol described) ; I female, X- 1948, Tibraca simulans H. Ruckes (not described), Tibraca ruckesi McDonald (not described) ( AMNH) . Rio Grande do Sul: Pelotas, I male, V- 1990, Schoens ; I male, 10-VI-1990, M. N. Miranda ; 1 male, VI-1990, Costa ; 1 female, VI- 1990, Marques ; 1 female, 28-IV- 1991, von Laer ; I female, V- 1991, Zepka ( UFRG) ; I male, IV- 1991, Monteiro ; 1 female, VI- 1991, Marcolin ; I male, 24-IV- 1993, Maguelly ( MCNZ) ; 1 male, 17-V- 1991, Chapon ( UFPL) ; I female, I1I- 1991, Oliveira ; I male, 25-I1 I-1991, Dai Molin ( MLPA) ; I male, 1lI- 1991, Silveira ( AMNH) ; I male, 27-V- 1994, Zanusso ( MZSP) ; I male, 20-11- 1991, Wetzel ; Canguçu, I male, 8-V-19919, Moreira ( DZUP) ; Capão do Leão, I male, 03-1-1991, Beskow ( USNM) . ARGENTINA, Cordoba: Almafuerte, La Cascada , 1female, XII- 1964, F.H. Walz ; El Quebracho , I female, 1-1965, F. H. Walz ( RMNH) . Buenos Aires: Buenos Aires, Berisso , 04-XI- 1973, O. S. Flint ( USNM) . URUGUAY, I male and I female, Boucard, Naturhistoriska Riksmuseet Stockholm Loan # 744/9 1 and # 745/91, respectively ( NHRS) ; Montevideo, Sayago , I female, 1942, Tibraca limbativenlris Pirán det .; Santiago Vázquez, I male, 5-XI-1961, C.S. Morey, Tibraca limbativentris Pirán det .; 1 male, 21 -IX- 1960, en caraguatá ; 1 male, 15-X-1960, entre yuyos ( UYIC) .

Figures

Figs 1-6. Pygophores: (1, 2) Tibraca limbativentris dorsal and ventral view, respectively; (3,4) Tibraca similima dorsal and ventral view respectively; (5, 6) Tibraca exigua dorsal and ventral view respectively. (bs) Breast-like structures ofsuperior layer ofventral rim, (bpp) basal process of proctiger, (ca) cylindrical arms of superior layer of ventral rim, (cp) conical projections of inferior layer of ventral rim, (dr) dorsal rim, (pa) paramere, (vr) ventral rim, (x) tenth abdominal segment.

Figs 22-27. (23, 25, 27) Phallus lateral view: (23) Tibraca limbativenlris; (25) Tibraca similima; (27) Tibraca exigua. (22, 24, 26) Female genital plates, ventral view: (22) Tibraca limbativenlris; (24) Tibraca simi/ima; (26) Tibraca exigua. (dsd) Ductus seminis dista/is, (gc8) gonocoxites of eight segment, (gc9) gonocoxites of ninth segment, (la8) laterotergites of eight segment, (la9) laterotergites of ninth segment, (prcj1)processusconjunclivae 1, (prcj2) processus conjuntivae 2, (prph) processus phallolhecae, (x) tenth abdominal segment.

Figs 29-30. Laterotergites, gonocoxites and gonapophyses of ninth segmment, and ectodermieal genital ducts, ventral view. (29) Tibraca exigua; (30) Tibraca similima. (aac) Anterior annular crest, (eh) chilinellipsen, (es) capsula seminalis, (dur) duclus receplaculi, (g9) gonapophyses of ninth segment, (gc9) gonocoxites of ninth segment, (la9) laterotergites of ninth segment, (pac) posterior annular crest, (pco) pars communis, (pi) pars inlermedialis, (st) secondary thickenings ofgonapophyses 9, (tvi)thickening ofvaginal intima, (va) vesiculararea, (x) tenth abdominal segment.