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

description: Thyanta (Phacidium) acutangula Jensen-Haarup
Figs. 109-123, Map 4
Thyanta acutangula Jensen-Haarup, 1928: 189, 190-191.
Thyanta mendozana Jensen-Haarup, 1928: 189, 190. NEW SYNONYMY.
Thyanta crinita Ruckes, 1957b:4 ~6. NEW SYNONYMY.
Diagnosis. Medium-sized; ovate. Dorsal surface pale brown to dark green, sometimes dark brown, often marked with yellow around pronotal cicatrices, along anterolateral margins of pronotum, and on apex of scutellum; punctures usually concolorous with surface, sometimes brown.
Head evenly rounded apically; outer jugal margins sinuous, nearly parallel for middle third of distance from eyes to apex (Fig. 110). Anterolateral margins of pronotum slightly concave in dorsal view; humeral angles angulate to spinose, flaring dorsad and slightly caudad, apices usually piceous (Fig. 109). Pronotal cicatrices immaculate or sometimes marked with black in mesial angles.
Mesial margins of basal plates in caudoventral view straight to slightly convex; posterior margins convex; posteromesial angles rounded (Fig. 121). Sclerotized rod slightly swollen subapically, narrowed but not elongate apically (Fig. 122); spermathecal duct swollen and coiled below proximal flange (Fig. 123). Posteroventral surface of pygophore rounded; posterior margin sinuously U-shaped in caudal view, medial portion concave (Fig. 11 7). Posterior margin of pygophore nearly straight in ventral view (Fig. 118); slightly convex in dorsal view, posterolateral angles not at all prominent (Fig. 119); straight to weakly concave in lateral view (Fig. 120). Each paramere robust, acuminately spinose in medial and ectal views (Figs. 111, 113); roughened spiculate area on lateral surface narrow, elongate (Fig. 112). Each lateral conjunctiva! lobe of aedeagus spinose apically and with rounded, partially sclerotized diverticulum ventrally (Fig. 114); dorsomedial conjunctiva! lobe present (Fig. 115); median penial lobes hooked; penisfilum large, elongate, curving ventrad (Fig. 116).
Types. Jensen-Haarup (1928) described T. acutangula from 355 and 3'i?'i? all from Mendoza Province in Argentina. He did not, however, designate a holotype or paratypes. The 5 labeled (a) "Est. Pedregal Prov. de Mendoza Rep. Argentina J.-Hrp." (b) " Type Coll. J=Hrp." (c) "Coll. Jensen-Haarup" (d) "Thyanta acutangula JensenHaarup leg." is designated lectotype. The remaining five specimens are designated paralectotypes. They have the following label data: (a) "Mendoza" (b) "Coll. JensenHaarup" (c) " Type Coll. J=Hrp." (d) " Thyanta acutangula Jensen-Haarup leg" (5); (a) "Mendoza 25.3.08 " (b) " Type Coll. J=Hrp." (c) "Coll. Jensen-Haarup" (d) " Thyanta acutangula Jensen-Haarup leg" (5); labeled as lectotype except (b) and (c) are reversed and (d) "ThyantaacutangulaJ-Hrp. Coll. Jensen-Haarup" ('i?); (a) "Chacr. de Coria Prov. de Mendoza Rep. Argentina Jensen-Haarup" (b) " Type Coll. J=Hrp." (c) " Type " (d) " Thyanta acutangula Jensen-Haarup leg." ('i?); and (a) "Mendoza 12.4.07 " (b) " Type Coll. J=Hrp." (c) " Type " (d) " Thyanta acutangula n. sp. J-Hrp." ('i?). All six specimens were examined and are conserved in the Universitetets Zoologiske Museum (Copenhagen, Denmark).
Jensen-Haarup (1928) described T. mendozana from 15 from the province of Mendoza, Argentina. The holotype is of the brown form and is slightlyteneral, making some characters hard to distinguish. Although the holotype has the humeral angles obtusely rounded, it does have fuscous markings on the ventral surface of each humeral angle, a trait characteristic of T. acutangula. Its male genitalia are virtually indistinguishable from those of T. acutangula. The holotype was examined and is housed in the Universitetets Zoologiske Museum (Copenhagen, Denmark).
Ruckes (1957b) described T. crinita from 1 ~ and 222 from Argentina. The holotype and one paratype were examined, and they do not differ in any significant respect from T. acutangula. These specimens are housed in the Cornell University collection (New York).
Distribution. Western Argentina (Map 4).
Specimens examined. 135 specimens collected from 6 January to 5 April; deposited in AMNH, CAS, CU, EGER, IML, LHR, MBR, MLP, PUL, USNM, ZMB. BOLIVIA: Chuquisaca: Muyupampa. Cochabamba; 30 mi SW Cochabamba. La Paz: Sorata. Mataral: Santa Rosa. ARGENTINA: Catamarca: Belen; El Rodeo. Chubut: Altares; Puerto Madryn. Cordoba: Alta Garcia; 5 mi N Dean Funes; Guanaco Muerto. La Pampa: Lihuel Calel; Puelen. La Rioja. Mendoza: Chacr. de Coria; El Sosneado; Est. Pedregal; Portrerillos. Neuquen: Barrancas. Rio Negro: Choele-Choel; General Fernandez Oro; San Antonio Oeste; Villa Regina. Salta: Cafayate; Cnel. Moldes; Metan; San Lorenzo. San Luis: Beasley; San Luis; San Martin. Tucuman: Amaicha del Valle; Crest ridge, NW Tucuman; Quebrada de Lules; Rio Calchuquier.
Comments. This species is related to T. juvenca, and may actually be a subspecies of that species. The genitalia of the two species are nearly identical. Thyanta acutangula can be separated from T. juvenca by the angulate to spinose humeral angles.
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 25-27