Tibraca exigua Fernandes & Grazia, 1998

Barros, Lurdiana D., Paim, Marcelo R., Krein, Verônica, Carabajal, Victor, Brandão, Marcela N., Bernardes, Paula De O. & Lindner, Mariana F., 2021, Illustrated guide to Pentatominae (Hemiptera: Pentatomidae) species associated with the four main grain crops in Rio Grande do Sul state, Brazil, Zootaxa 4958 (1), pp. 430-478 : 468-469

Tibraca exigua Fernandes & Grazia, 1998

( Figs 109–112 )

Tibraca exigua Fernandes & Grazia, 1998: 1057 .

Material studied. Camaquã: 1♂, 08.V.1991, H. Moreira leg. ( UFRG) . Pelotas: 1♀, VI.1991, Marcolin leg. ( UFRG) ; 1♂, 10.VI.1990, M. N. Miranda leg. ( UFRG) ; 1♂, 20.II.1991, P. Welzel leg. ( UFRG) ; 1♂, V.1991, R. Zepra leg. ( UFRG) ; 1♀, 28.IV.1991, R. Von Laer leg. ( UFRG) ; 1♂, III.1991, Silveira leg. ( UFRG) ; 1♂, 27.V.1994, J. T. Zanusso leg. ( UFRG) ; VI.1990, 1♂, Costa leg. ( UFRG) ; 27.IV.1993, 1♂, O. Maguelly leg. ( MCNZ) ; 1♂, VI.1990, Marques leg. ( UFRG) ; 1♂, V.1990, Schallens leg. ( UFRG) ; 1♂, IV.1991, Monteiro leg. ( UFRG) ; 1♂, 26.X.1994, I. M. Silva leg. ( UFRG) ; 1♀, 17.III.1991, H. Gastal leg. ( UFRG) ; 1♂, 17.V.1991, D. Chapon leg. ( MECB) . São Francisco de Paula : 1♀, 17–19.XII.2005, V. C. Matesco leg. ( UFRG) .

Diagnostic features. Body dorsal and ventral surfaces dark castaneous ( Fig. 109, 111 ). Head longer than wide. Mandibular plates shorter than clypeus, rounded apically ( Fig. 110 ). Clypeus robust and raised above the mandibular plates. Antennomere 2 smaller than the first ( Fig. 110 , red arrow). Anterolateral margins of pronotum impunctate or rarely punctate at the lateral portion ( Fig. 110 ). Internal angles of cicatrices of pronotum with pale yellow callosity. Humeral angles slightly developed ( Fig. 110 ).Apex of radial vein of corium with pale yellow callosity. Connexivum castaneous with margin light castaneous and a small black spot at the apex ( Fig. 109 ). Body length: 9.00–12.00 mm ( Fernandes & Grazia 1998).

Recorded host plants. Rice ( Fernandes & Grazia 1998).

Distribution in Rio Grande do Sul. Camaquã, Canguçu, Capão do Leão, Pelotas and São Francisco de Paula ( Fig. 112 ).

Comments. This species is similar to T. limbativentris , being differentiated by its darker color and smaller body size.

Figures

FIGURES 109–112. Tibraca exigua. 109: Dorsal view, scale bar = 1.0 mm. 110: Head and pronotum, arrow indicates antennomere 2. 111: Abdomen, lateral view. 112: Distribution within Rio Grande do Sul.