Thyanta (Phacidium) aeruginosa Berg
Creators: name: Rider, D. A.
name: Chapin, J. B.
Publisher: name: Zenodo
Year: 1991
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Thyanta
Thyanta aeruginosa

description: Thyanta (Phacidium) aeruginosa Berg
Figs. 48-63, Map 1
Thyanta aeruginosa Berg, 1878: 24; Lethierry and Severin, 1893: 147; Kirkaldy, 1909: 94; Rolston and McDonald, 1984:83-84.
Phacidium euchlorum Breddin, 1912:92-93. (syn. by Rolston and McDonald, 1984)
Diagnosis. Ovate, distinctly convex; dorsal punctation minute, dense.
Head declivitous; juga distinctly longer than tylus, outer jugal margins subparallel for middle third of distance from eyes to apex (Fig. 49). Segment 2 of each antenna at least 1. 5 times as long as segment 3. Posterior termination ofeach buccula arcuately truncate. Anterolateral margins of pronotum weakly carinate, straight to slightly concave; each humeral angle rounded, at most protruding slightly beyond base of adjacent corium (Fig. 48); pronotal cicatrices immaculate, often slightly paler than surrounding surface. Hemelytral membranes hyaline, lacking brown flecks. Connexiva and abdominal venter lacking all black markings. Superior surface of each tibia asulcate.
Mesial and posterior margins ofbasal plates straight to slightly convex, posteromesial angles rounded (Fig. 63). Sclerotized rod slightly swollen subapically, narrowed apically (Fig. 61); spermathecal bulb globose; spermathecal duct forming cylindrical structure below proximal flange (Fig. 62).
Posteroventral surface of pygophore arcuately rounded; posterior margin of pygophore sinuously U-shaped in caudal view (Fig. 51); slightly convex in lateral view (Fig. 54); posterolateral angles prominent in ventral and dorsal views (Figs. 52, 53). Apex of each paramere spinose, curving gently mediad from ectal view (Fig. 60); ectal surface convex, lacking dorsomedial concave surface (Fig. 58); roughened, spiculate area on lateral surface elongate, linear (Fig. 59). Aedeagus with each lateral conjunctival lobe somewhat reduced, apices of median penial lobes visible from lateral view (Fig. 57); penisfilum well-developed (Fig. 55); theca lacking dorsolateral protuberance near caudal limit (Fig. 56).
Types. Berg (1878) described T. aeruginosa from at least lc3 and 3'i?'i? from Buenos Aires and Mendoza, Argentina, without designating a holotype or paratypes. The 'i? labeled (a) " Typus " (b) "Buenos Aires" (c) "1398" is designated lectotype. The remaining three specimens are designated paralectotypes. They have the following label data: (a) " Typus " (b) "Mendoza" (c) "1398" (2'i?'i?); and (a) " Typus " (b) "Buenos Aires" (c) " Thyanta aeruginosa Berg " (d) "1398" (c3?-abdomen missing). The lectotype and all three paralectotypes were examined, and are conserved in the Universidad Nacional de La Plata (Argentina).
Breddin (1912) described Phacidium euchlorum from l 'i? and 2c3c3; without designating a holotype or paratypes. Rolston and McDonald (1984) synonymized this species with T. aeruginosa and designated a lectotype and paralectotypes. The type specimens, which are housed in the Universite Louis Pasteur, Strasbourg, France, were examined.
Distribution. Southern South America (Map 1).
Specimens examined. 260 specimens collected between 24 September and 25 June; deposited in AMNH, BMNH, CAS, CU, DAR, LHR, MBR, MLP, SMEK, UNL, USNM, ZMB. PARAGUAY: Gran Chaco, 260 km W Paraguay R. ARGENTINA: Ibarra Grasso. Buenos Aires: Buenos Aires; Lujan; Punta Lara; Quesada; Santa de la Ventana; Tigre. Catamarca. Chaco: Resistencia. Chubut: Trelew. Cordoba: Ao. Tegua; Cordoba. Corrientes: Concepcion. Formosa: Gran Guardia. Jujuy: Jujuy. La Rioja: Guandacol; 20 km N La Rioja; Los Robles. Mendoza: Mendoza; 100 km N Mendoza; Potrerillos; San Martin; San Rafael; 40 km N San Rafael. Neuqueun: Barrancas. Rfo Negro: General Fernandez Oro. San Juan: San Juan; 51 mi N San Juan. San Luis: Buena-Vista R. Batavia. Santa Fe: Carcaraiia; Ceres; Montevideo; Santa Fe; Santa Fe River Salt Flats; Villa Ana. Santiago def Estero: Chaco de Santiago; Rio Salado. Tucuman: San Miguel de Tucuman. URUGUAY: Colonia: La Estanzuela. Montevideo: Montevideo. San Jose: Santa Luzia.
Comments. Thyanta aeruginosa can be separated from all other congeners by the asulcate tibiae, the juga which are distinctly longer than the tylus, and the second antennal segment which is distinctly longer than the third segment.
description: Published as part of Rider, D. A. & Chapin, J. B., 1991, Revision Of The Genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) I. South America, pp. 1-77 in J. New York Entomol. Soc. 99 on pages 16-18