Edessa nigricornis, Stal, 1862

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), Zootaxa 5240 (1), pp. 1-63 : 39

publication ID	https://doi.org/ 10.11646/zootaxa.5240.1.1
publication LSID	lsid:zoobank.org:pub:2FE467C1-EAC2-4E90-B673-CCE2CCA93C1D
DOI	https://doi.org/10.5281/zenodo.7871428
persistent identifier	https://treatment.plazi.org/id/03B487C0-FFEC-2537-FF47-C654FA33F826
treatment provided by	Plazi
scientific name	Edessa nigricornis
status

Treatment

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 View FIGURE 28 ). Ventral surface dark yellow to brown with transversal brown lines on thorax and abdomen ( Fig. 28 D View FIGURE 28 ). Antennae with first segment brown and second segment dark brown ( Fig. 28 C View FIGURE 28 ). Pronotum with punctures brown ( Fig. 28 C View FIGURE 28 ). Humeral angles short (1,2 times wider than long) ( Fig. 28 C View FIGURE 28 ), apices black ( Fig. 28 C View FIGURE 28 ); humeral angle black spot restricted to the angle in dorsal and ventral views ( Fig. 28 C,D View FIGURE 28 ). Scutellum with punctures brown ( Fig. 28 C View FIGURE 28 ); apex not reach end of corium ( Fig. 28 C View FIGURE 28 ). Corium with all veins concolorous with surface ( Fig. 28 C View FIGURE 28 ). Posterolateral angles of connexivum with apices concolorous with surface ( Fig. 28 C View FIGURE 28 ); connexival segments with subelliptical black spots occupying less than half the segments ( Fig. 28 C View FIGURE 28 ); spots not extending ventrally ( Fig. 28 D View FIGURE 28 ). Ventral surface. Thorax with brown stripes ( Fig. 28 D View FIGURE 28 ); dark stripe of the propleuron covering 2/3 of the width of the sclerite ( Fig. 28 D View FIGURE 28 ). Evaporatorium concolorous with thorax ( Fig. 28 D View FIGURE 28 ). Metasternal process ( Fig. 16 G View FIGURE 16 ) 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 View FIGURE 28 ). Abdomen with spine of third segment acuminated. Intersegmental areas black not reaching lateral margin ( Fig. 28 D View FIGURE 28 ). Pseudosutures concolorous with surface ( Fig. 28 D View FIGURE 28 ). Median longitudinal brown band incomplete ( Fig. 28 D View FIGURE 28 ). 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 View FIGURE 16 ). Male genitalia, dorsal side of the pygophore with a suffused brown area occupying 1/3 of the surface ( Fig. 16 B,D,E View FIGURE 16 ). Posterolateral angle of the pygophore developed ( Fig. 16 A View FIGURE 16 ). 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 View FIGURE 16 ). Ventral rim setose with medial tufts ( Fig. 16 C View FIGURE 16 ). Female genitalia, laterotergites VIII with dark band on outer lateral margins. ( Fig. 16 F View FIGURE 16 ).

Male genitalia ( Fig. 16 A–E View FIGURE 16 ): Parameres with black margin; anterior lobe round; dorsal lobe rounded and subtriangular; posterior lobe subrectangular and rounded ( Fig. 16 B,D,E View FIGURE 16 ). Proctiger with subtriangular posterior face ( Fig. 16 D,E View FIGURE 16 ). Ventral rim with expansions undeveloped and concolorous with surface ( Fig. 16 C View FIGURE 16 ).

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 View FIGURE 16 ).

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 View FIGURE 28 ). But E. (E.) nigricornis can be separated by humeral angles clearly more developed than in the other species ( Figs. 25 C View FIGURE 25 , 28 C,E View FIGURE 28 ). Also, each connexival segment without concavities or medial yellow spot ( Fig. 28 C View FIGURE 28 ), 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 View FIGURE 25 , 28 E View FIGURE 28 ), and punctures are irregularly distributed around yellow spot.