Grammedessa hamata ( Walker, 1868 )

Silva, Paulo Augusto Lima Da & Fernandes, José Antônio Marin, 2022, Description of six new species to Grammedessa Correia & Fernandes, 2016 (Heteroptera: Pentatomidae: Edessinae), Zootaxa 5129 (2), pp. 211-226 : 215-216

Grammedessa hamata ( Walker, 1868)

( Figs. 1A–B ; 2A–D )

Diagnosis. Length 17 mm. Width 16 mm. Humeral angles projection strongly developed, spiniform ( Fig. 1A–B ). Dorsal surface green, punctures on brown spots forming irregular lines ( Fig. 1A ). Costal margin and disc of corium homogeneously punctured; hypocostal ridge with punctures and spots dark brown to black. Beneath with three yellow stripes separating two green areas densely spotted, containing punctures on the thorax ( Fig. 1B ). Propleura mostly green; densely punctured, punctures on dark brown spots. Antennae brown, first three segments finely spotted. Legs greenish-brown. Metasternal process yellow with few lateral spots ( Fig. 1B ). Connexivum green. Rounded area lateral to evaporatorium dark green ( Fig. 1B ). Yellow lateral stripe with black rounded spots ( Fig. 1B ). Parameres long, Y-shaped ( Fig. 2C ). Proctiger keel along the entire median line ( Fig. 2C ).

Description. Head wider than long (1.3 times). Thorax: pronotum wider than long (3.7 times) with a yellow longitudinal median line ( Fig. 1A ). Meso and metapleura with punctures concentrated in spots. Metasternal process with long, digitiform, anterior arms, sometimes bearing a green line. Abdomen: posterolateral angles of the connexival segment VII, long, exceeding the angles of laterotergites and 9 in the female ( Fig. 2D ); angle dorsally dark brown and ventrally brown. Pair of trichobothria lateral to spiracles.

Male ( Fig. 2A–C ). Pygophore yellow, elongated (1.3 times longer than wide). Dorsal rim rounded, dark brown, medially slightly projected ( Fig. 1A ). Superior processes of the genital cup small, reniform, medially excavated, touching dorsal rim ( Fig. 2C ). Parameres with a lobe anteriorly directed long and straight and a lobe dorsally directed curved and shorter than the other. Proctiger light brown, elongated (1.6 times), wider ventrally; posterior surface laterally sloping ( Fig. 2C ). Ventral rim concave; expansions not projected but tumid ( Figs 2B–C ). Ventral surface with black stripe parallel to the ventral rim.

Female ( Fig. 2D ). Valvifers 8 wider than long (1.1 times); slightly separated; posterior margin acuminate; dense and irregularly punctuated. Valvulae 8 partially visible between valvifers 8. Valvifer 9 wider than long (2.2 times) and setulose. Laterotergites 8 with a long distal spine as long as segment X. Laterotergites 9 flattened shorter than laterotergites 8.

Comments. Walker (1868) described the antennae of E. hamata as being black, but they are dark brown. The description also cites four stripes on the head, the same observed by Correia & Fernandes (2016) when describing Grammedessa ; however, the two central stripes of the head are four stripes, totaling eight stripes on the head, four on each side. This species is easily distinguished from other Grammedessa by its posterolateral angles of the pronotum extremely developed, and parameres Y-shaped.

Examined material ( n=4). Holotype: BRAZIL: Ega , 57/26 [Tefé, Amazonas,] (1Female-BMNH). BRAZIL: Amazonas. [Brasilia borealis, Edessa (Dorypleura) botocuda Kirk. ] (1Male /1Female-USNM). PERU: Madre de Dios. [Manu, Pakitza, 11°56’S / 71°18’W, 250m 19–20.IX.1989, D. Adamski & M. Epstein] (1Male-USNM).

Distribution. PERU: Madre de Dios. BRAZIL: Amazonas.

Figures

FIGURE 1. Grammedessa. A–B: G. hamata comb.n. A: Dorsal view. B: Ventral view. C–D: G. nigricava sp.n. C: Dorsal view. D: Ventral view. E–F: G. longispina sp.n. E: Dorsal view. F: Ventral view. G–H: G. fundicava sp.n. G: Dorsal view. H: Ventral view. I–J: G. graciligramma sp.n. I: Dorsal view. J: Ventral view. K–L: G. stichtocephala sp.n. K: Dorsal view. L: Ventral view. M–N: G. acalyptoprocta sp.n. M: Dorsal view. N: Ventral view. Scale = 10 mm.

FIGURE 2. Genitalia of G. hamata comb.n. A–C: Male genitalia. A: Pygophore in dorsal view. B: Pygophore in ventral view. C: Pygophore in posterior view. D: Female genital plates in ventral view. Dr: Dorsal rim. Vf8: Valvifers 8. Vf9: Valvifer 9. Gc: Genital cup. Lt8: Laterotergites 8. Lt9: Laterotergites 9. Prc: Proctiger. Pla: Posterolateral angles. Pr: Parameres. Pyg: Pygophore. Vr: Ventral Rim. X: Segment X. Scale = 1 mm.