Edessa nigricornis Stal 1862
Creators: name: Mendonça, Maria Thayane Da Silva
name: Silva, Valéria Juliete Da
name: Fernandes, José Antônio Marin
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Edessa
Edessa nigricornis

description: Edessa nigricornis. Lectotype female. México / Sallé / (NHRM). Examined.
Material examined. MEXICO, Veracruz: 1♁, Unam, Los Tuxtlas esta. Biol., 16–19-IX-1989, E. Barrera & T. J. Henry coll. (USNM); 1♀, Los Tuxtlas esta. Biol., 18-III-1985, P. Sinaca (Comp. W type — Fernandes JAM 1999) (UFPA); Quintana Roo: 1♁, Tulum, Pointana, 3-VIII-1981, E. PECH (UNAM); 1♀, Quintunalo, Muivolcan, VII-1983, F. L. Welling (JEE); 1♁, Quintana, Roo Nuevo, 13-VIII-1982, E. C. Welling coll. (JEE); Chiapas: 1♁, Chiapas, Junho, D. B. Thomas coll. (TH). GUATEMALA, El Petén: 1♁, Tikal, Peten, 16-VIII-1974, D. Engleman (DOE); Izabal: 1♀, Morales, 1-V-1972 (UFPA).
Measurements (n= 8). Total length: 18.8–22.3; head length: 1.8–1.9; head width: 3.5–3.5; pronotum length: 4.2–4.8; pronotum width: 13.5–16.1; scutellum length: 8.5–9.7; scutellum width: 6.5–8.0; abdominal width: 10.8– 13.0; length antennomers: I: 1.0–1.0; II: 1.5–1.5; III: 1.9–2.0; IV: 3.9–4.0; V: 0.0–0.0.
Diagnosis. Specimens large (18.8–22.3 mm). Dorsal surface olive green (Fig. 28 C). Ventral surface dark yellow to brown with transversal brown lines on thorax and abdomen (Fig. 28 D). Antennae with first segment brown and second segment dark brown (Fig. 28 C). Pronotum with punctures brown (Fig. 28 C). Humeral angles short (1,2 times wider than long) (Fig. 28 C), apices black (Fig. 28 C); humeral angle black spot restricted to the angle in dorsal and ventral views (Fig. 28 C,D). Scutellum with punctures brown (Fig. 28 C); apex not reach end of corium (Fig. 28 C). Corium with all veins concolorous with surface (Fig. 28 C). Posterolateral angles of connexivum with apices concolorous with surface (Fig. 28 C); connexival segments with subelliptical black spots occupying less than half the segments (Fig. 28 C); spots not extending ventrally (Fig. 28 D). Ventral surface. Thorax with brown stripes (Fig. 28 D); dark stripe of the propleuron covering 2/3 of the width of the sclerite (Fig. 28 D). Evaporatorium concolorous with thorax (Fig. 28 D). Metasternal process (Fig. 16 G) with anterior apex straight and laterally well expanded, margin acuminated; anterior face somewhat excavated; anterior bifurcation receiving fourth rostral segment. Legs brown (Fig. 28 D). Abdomen with spine of third segment acuminated. Intersegmental areas black not reaching lateral margin (Fig. 28 D). Pseudosutures concolorous with surface (Fig. 28 D). Median longitudinal brown band incomplete (Fig. 28 D). Trichobotria one in line with spiracle and the other laterad. Posterolateral angles of segment VII not reaching the level of apices of laterotergites IX in females (Fig. 16 F). Male genitalia, dorsal side of the pygophore with a suffused brown area occupying 1/3 of the surface (Fig. 16 B,D,E). Posterolateral angle of the pygophore developed (Fig. 16 A). Superior process of genital cup laminar, rectangular, thick; flattened and coarse un posterior view, continuing ventrally in a crenulated long carina (Fig. 16 B,E). Ventral rim setose with medial tufts (Fig. 16 C). Female genitalia, laterotergites VIII with dark band on outer lateral margins. (Fig. 16 F).
Male genitalia (Fig. 16 A–E): Parameres with black margin; anterior lobe round; dorsal lobe rounded and subtriangular; posterior lobe subrectangular and rounded (Fig. 16 B,D,E). Proctiger with subtriangular posterior face (Fig. 16 D,E). Ventral rim with expansions undeveloped and concolorous with surface (Fig. 16 C).
Female genitalia: Valvifers VIII with dark punctures; inner margins contiguous, with brown band and divergent; distal margin with brown band and arched. Laterotergites IX with apices rounded passing the sclerite uniting laterotergites VIII (Fig. 16 F).
Comments. The male of Edessa (E.) nigricornis is described for the first time. The E. (E.) nigricornis is quite similar to E. (E.) electa and E. (E.) nigroangulata. These species are large and show the humeral angles short and curved backwards (Fig. 28 C). But E. (E.) nigricornis can be separated by humeral angles clearly more developed than in the other species (Figs. 25 C, 28 C,E). Also, each connexival segment without concavities or medial yellow spot (Fig. 28 C), and punctures uniformly distributed, while in E. (E.) electa and E. (E.) nigroangulata connexival segments clearly show concavities separated by yellow spots (Figs. 25 C, 28 E), and punctures are irregularly distributed around yellow spot.
Distribution (Fig. 32 A,B): MEXICO: Veracruz, Quintana Roo, Chiapas, Mexico City; GUATEMALA: El Petén, Izabal.
description: Published as part of Mendonça, Maria Thayane Da Silva, Silva, Valéria Juliete Da & Fernandes, José Antônio Marin, 2023, Diagnose of the nominal subgenus of Edessa and description of the E. sexdens group (Heteroptera, Pentatomidae, Edessinae), pp. 1-63 in Zootaxa 5240 (1) on page 39, DOI: 10.11646/zootaxa.5240.1.1, http://zenodo.org/record/7639547