Thyanta (Argosoma) patruelis (Stal)

Rider, D. A. & Chapin, J. B., 1991, Revision Of The Genus Thyanta Stal, 1862 (Heteroptera: Pentatomidae) I. South America, J. New York Entomol. Soc. 99, No. 1, pp. 1-77 : 37-39

Thyanta (Argosoma) patruelis (Stal)

Figs. 184-198, Map 2

Pentatoma patruelis Stal, 1859:226-227 ; Walker, 1867:289.

Thyanta patruelis: Stal, 1862a:58 ; Stal, 1872:35; Berg, 1878:23; Lethierry and Severin, 1893: 148; Kirkaldy, 1909:95.

Thyanta humilis Bergroth, 1891:225-226 . NEW SYNONYMY.

Thyanta nitidula Ruckes, 1956:62-63 , fig. 4; Rolston and McDonald, 1984:fig. 30. NEW SYNONYMY.

Diagnosis. Small to medium; dorsal surface green to brown, often with reddishpurple markings between humeral angles, on dorsal surface of head, on apex of scutellum, and on apex of each corium; punctures concolorous with surface.

Outer jugal margins subparallel for middle third of distance from eyes to apex ( Fig. 185). Anterolateral margins of pronotum straight to weakly concave in dorsal view; humeral angles rounded to angulate, produced beyond base of adjacent coria by width ofeye or less ( Fig. 184). Pronotal cicatrices immaculate. Connexiva narrowly exposed; posterolateral angle of each segment usually marked with piceous, sometimes only minutely so. Ostiolar canals acuminate apically. Postspiracular spots lacking; posterolateral angles of abdominal sternites usually piceous.

Mesial margins of basal plates straight to slightly convex, separated basally; posterior margins straight to slightly convex; posteromesial angles rounded or slightly emarginate ( Fig. 196). Sclerotized rod slightly swollen subapically, narrowed apically ( Fig. 197). Spermathecal duct greatly swollen below proximal flange, carrot-shaped ( Fig. 198). Posterolateral angles of pygophore only slightly prominent in lateral view ( Fig. 195); posteroventral surface of pygophore distinctly depressed between blunt chin-like protuberance and posterior margin of pygophore; posterior margin of pygophore broadly and shallowly CT-shaped in caudal view ( Fig. 192). Apex of each paramere distinctly spinose in both medial and ectal views ( Figs. 186, 188), roughened spiculate area on lateral surface ovoid ( Fig. 187). Each lateral conjunctiva! lobe of aedeagus with 1 -2 nonsclerotized diverticula ( Fig. 191); dorsomedial lobe absent ( Fig. 190); penisfilum small, median penial lobes spatulate, nearly hidden by conjunctiva! lobes ( Fig. 189).

Types. Stal (1859) described P. patruelis from 12 specimen from Rio de Janeiro, Brazil. The holotype, which is conserved in the Naturhistoriska Rikoriska Rikomuseet (Stockholm, Sweden), was examined.

Bergroth (1891) described Thyanta humilis from at least two specimens from Minas Gerais, Brazil. Grazia (1987) made lectotype and paralectotype designations. The lectotype was examined, and is currently housed in the Museum National d'Histoire Naturelle (Paris, France). Although this specimen is smaller and somewhat more depressed than the holotype of T. patruelis, there are very few differences that will separate the two (see Comments below).

Thyanta nitidula was described by Ruckes (1956) from 12'35 and 322, all from Brazil. The holotype was examined, and is conserved in the American Museum of Natural History (New York). This specimen is intermediate in size between the lectotype of T. humilis and the holotype of P. patruelis and falls within the range of variation exhibited by these two specimens (see Comments below).

Distribution. Central Brazil and southern Peru south to Argentina ( Map 2).

Specimens examined. 584 specimens collected during every month of the year except August; deposited in: AMNH, BMNH, CAS, CU, DAR, DBT, EGER, ISU, LACM, LHR, MBR, MGA, MCN, MNRJ, MZRS, OSU, POLH, PUL, SMEK, DEC, UMA, UNAM, USNM, ZMB. PERU: Curabaya ; La Merced, Chanchamaya ; Cusco: Quillabamba . Junfn: 40-55 km SE Satipo . BRAZIL: Chapada de Guimaraes ; Demerary ; Lagoa de Camarim ; Nordeste ; Piriapolis . Bahia: Encruzilhada ; Itap ; Nova Conquista ; Salvador . Ceara: Barbalha ; Fortaleza . Espfrito Santo: Guarapari ; Linhares ; Vitoria . Goias: Argar~as ; Brasilia; Jatai . Mato Grosso: Cuiaba ; Independencia . Mato Grosso do Sul: Aquidauna ; Bodoqueiia ; Corumba ; Morro do Urucun ; Rondonopolis . Minas Gerais: Carmo do R. Clavo ; Cordisburgo ; Pedra Azul ; Bandeiro ; Santa Barbara, Varginha . Paraiba: Juazeirinho . Parafia: Araucaria ; 30 mi W Irati ; Rolandia ; Vila Velha Pk . Pernambuco : Bonito Prov .; Caruaru ; Petrolina . Rio de Janeiro: Mangaratiba ; Nova lgua~u ; Petropolis ; Quinta Boa Vista, Horto Botanica ; Rio de Janeiro ; Teresopolis . Rio Grande do Sul: Campos ; Glorinha ; Ipanema ; Pelotas ; Porto Alegre ; Santa Maria ; Taimbezinho, Parque Nacional dos Aparados da Serra Est .; Viamao ; Vila Oliva . Santa Catarina: Corupa ; Florianopolis ; Nova Teutonia . Sao Paulo: 10 mi S Guapara ; Piracicaba ; Sao Paulo ; Sao Vicenti . BOLIVIA: Cochabamba: Christal­Mayu , Prov. Chapare . La Paz: Yungas de La Paz . Santa Cruz: Buena Vista , Prov. Ichilo ; Robore ; Saavedra-Malezas, Est. Expt. Agr .; Santa Cruz . PARAGUAY: Asuncion: Asuncion . Gran Chaco . Central: Aregua ; Luque . Chaco: Rio Negro . Corrientes: San Bernardino . Guaira: Villarrica . Paraguarf . Presidente Hayes: 42 km NW Benjamin Aceval . ARGENTINA: Buenos Aires: Isla Martin Garcia ; Punta Lara ; San Isidrio . Chaco . Corrientes: San Roque . Entre Rios: Leigre ; Liebig . Formosa: Gran Guardia . Misiones: Apartado ; Bompland ; Eldorado ; Let ; Loreto ; Posados ; Puerto lguazu ; San Ignacio . Santa Fe: Villa Ana . URUGUAY: Canelones: Atlantida . Montevideo: Montevideo . Paysondu: Constancia . Rfo Negro .

Comments. Thyanta patruelis is a highly variable species with regard to both size and coloration. It is possible that it represents a group of several very closely related, morphologically indistinguishable species. Two specimens from opposite ends of the spectrum in variability (color, size) appear to be distinct species, but when a series of specimens are examinttd, it is obvious that all manner ofintermediates exist. Also, no matter what the size or color of the specimen, the male and female genitalia are constant, with only minor variations in an occasional specimen.