Grammedessa nigricava Da Silva & Fernandes, 2022

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 : 216-217

Grammedessa nigricava Da Silva & Fernandes sp.n.

( Figs. 1C–D ; 3A–D )

Diagnosis. Length 18 mm. Width 9.1 mm. Dorsal surface green, punctures black on dark brown spots forming irregular lines ( Fig. 1C ). Beneath green with two lateral stripes of dense, black punctures; evaporatorium dark brown ( Fig. 1D ). Humeral angles projection short, dentiform. Antennae and legs yellowish-green. Costal margin of corium and hypocostal ridge with punctures on dark spots. Posterolateral angles of pygophore developed; dorsal rim and most of the genital cup black ( Fig. 3B–C ). Genital cup excavated close to ventral rim; parameres short, claw-like ( Fig. 3C ). Genital plates irregularly punctured, punctures on black spots. Valvifers 8 strongly acuminated ( Fig. 3D ).

Description. Head wider than long (1.5 times). Forth and part of the third rostral segments laying on metasternal process anterior bifurcation. Thorax: Pronotum wider than long (2.7 times); cicatrices not delimited by grooves, with rows of black punctures forming irregular lines. Thoracic segments densely and irregularly punctured, punctures in black spots. Evaporatorium with black spots below outer translucent layer; lateral area semicircular, punctures on black spots. Metasternal process green; anterior bifurcation with arms strongly acuminate; distally with a few dark spots ( Fig. 1D ). Abdomen: connexivum densely punctuated, punctures black ( Fig. 1C ); segments III–VI medially with a callus. One trichobothrium in line and other lateral to the spiracles.

Male ( Fig. 3A–C ). Pygophore greenish-yellow, elongated (1.1x longer than wide). Dorsal rim rounded, not projected over the genital cup ( Fig. 3A ). Diaphragm back to parameres dark green ( Fig. 3C ). Superior processes of the genital cup small, reniform, gently excavated, touching the dorsal rim. Parameres dark yellow, contrasting with the mostly black genital cup; laterally compressed. Proctiger light brown, elongated (1.4 times), wider ventrally; laterally slightly excavated ( Fig. 3C ). Ventral rim in an open “V” ( Fig. 3B ); expansions not projected but tumid. Ventral surface irregularly punctured on distal third, punctures on black spots ( Fig. 3B ).

Female ( Fig. 3D ). Valvifers 8 wider than long (1.2 times); distal margin strongly acuminate and projected posteriorly exceeding valvifer 9. Valvulae 8 medially elevated, visible among valvifers 8. Valvifer 9 longer than wide (1.2 times), partially covered laterally by valvifers 8. Laterotergites 8 longer than wide (1.3 times), exceeding laterotergites 9. Laterotergites 9 flattened almost level with abdominal segment VII.

Etymology. The name refers to posterolateral angles of the pygophore black and deeply excavated. From the Latin. Nigrum (black or dark) and Cavus (excavation).

Comments. This species is distinguished from other Grammedessa by its posterolateral angles of the pygophore deeply excavated and black, and by its parameres claw-shaped.

Examined material (n=3). Holotype: FRENCH GUIANA: Sinnamary [Petite Montagne Tortue, 04°19’14.1 N / 052°14’27.5W, 08.IX.2010, Light trap, G. Lamarre leg. Coll R. Lupoli] MNHN (EH) 136 (1Male-MNHN) . Paratypes: FRENCH GUIANA: Saint-Laurent-du-Maroni [ Route d’Apatou pK25, 06.VIII.2013, Light trap, S.E.A.G. leg. Coll R. Lupoli] (1Female-RL). Saül [ MNHN Balachowsky-Charpentier-Gruner mission, X-XII.1969,, 27.X.1969] MNHN (EH) 137 (1Female-MNHN) .

Distribution. FRENCH GUIANA: Saint-Laurent-du-Maroni. Sinnamary, Saül.

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 3. Genitalia of G. nigricava sp.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. Scale = 1 mm.