Euschistus (Lycipta) riograndensis Weiler & Grazia,

Weiler, Luciana, Ferrari, Augusto & Grazia, Jocelia, 2011, Contributions to the knowledge of Euschistus (Lycipta) with the description of E. (L.) riograndensis sp. nov. (Hemiptera: Heteroptera: Pentatomidae: Pentatominae: Carpocorini), Zootaxa 3067, pp. 59-64: 60-64

publication ID 10.11646/zootaxa.3067.1.5

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Euschistus (Lycipta) riograndensis Weiler & Grazia

sp. nov.

Euschistus (Lycipta) riograndensis Weiler & Grazia  , sp. nov.

( Figs. 1 –5View FIGURES 1 – 7, 8–9, 11– 15View FIGURES 8 – 13View FIGURES 14 – 15)

Etymology. The species is named for the type locality.

Type locality. São Francisco de Paula, Rio Grande do Sul, Brazil.

Description. Male. Color: Dorsal surface (fig. 1) light to dark castaneous; ventral surface mostly dark castaneous (fig. 2). Ferruginous punctures on dorsal and ventral sides more numerous on abdomen and coarsely on thoracic segments. Antennae ferruginous, clear rings at base of segments III to V. Scutellum base angles with small ferruginous fovea, apex with 1 + 1 ferruginous spots. Segments of connexivum with dark round spot at base and apex. Legs light castaneous with coarse dots dark castaneous to ferruginous on femur and tibia. Tarsi immaculate, apical segment darkened. Spiracles luteous.

Clypeus acuminate, subequal in length to juga. Anterolateral margins of pronotum denticulate; humeral angles rectilinear less projected than in E. machadus  . Pronotum cicatrices with a subcalloused spot at posterior margin, concolorous with pronotum. Posterolateral angles of urosternites less projected. Hemelytral veins reticulate.

Genitalia. Pygophore (figs. 3 –5, 8) very similar to E. machadus  differing in the size and proportion of the pygophoral structures as follows: superior process of dorsal rim (tumescence of Rolston 1982), in the area folded toward genital capsule, broader than in E. machadus  (figs. 6–7); median third of dorsal rim slightly concave. Paramere head scythe-like, folded with foot in a larger angle than in E. machadus  ; paramere foot subquadrangular, smaller than in E. machadus  (figs. 9–10). Phallus: posterolateral angles of phallotheca developed (fig. 11); processus phallothecae thickened at base, divergent, almost attaining apex of processus vesicae (fig. 11–12). Conjunctiva wide, mostly hyaline, except the conjunctival appendages. Processus vesicae well developed, sclerotized, forming a spout where the ductus seminis distalis rests (fig. 12); ductus seminis distalis forming a spiral with at least two and a half turns (fig. 13). Secondary gonopore spatulate opening up towards processus vesicae (fig. 13).

Measurements (n= 13): total length 7.5 (7.14–7.83); head length 1.99 (1.9–2.09); head width 2.0 (1.92–2.05); length before eyes 1.06 (1.03–1.1); interocular width 1.25 (1.1–1.29); eye width 0.34 (0.32–0.38); antennal segments length: I 0.54 (0.47–0.57); II 0.79 (0.6–0.85); III 0.86 (0.79–0.95); IV 1.07 (0.98–1.2); V 1.3 (1.1–1.39); pronotum length 2.02 (1.9–2.13), pronotum width 4.76 (4.4–4.96); pronotum width with spine 5.6 (5.44–5.76); scutellum length 3.34 (3.12–3.51); scutellum width 3.33 (3.2– 3.51); abdomen length till VII segment 3.48 (3.2– 3.67); abdomen width 5.06 (4.88–5.28).

Female. Genitalia. Gonocoxites 8 (gc 8) with sutural margins sinuate, overlapping (fig. 14); sutural angles with dense hairiness. Posterior margins of gonocoxites 8 indented where anterolateral angles of gonocoxites 9 (gc 9) fit; gc 9 with median sulcus, with dense hairiness, forming an obtuse angle with X segment. Laterotergites 9 (la 9) just attaining band uniting dorsally laterotergites 8 (la 8). Posterior margins of laterotergites 8 slighted projected posteriorly (fig. 14). Gonapophyses 8 quadrangular. Chitinellipsen present. Anterior thickening of vaginal intima bubblelike, longer than wide, posterior thickening ring-like (fig. 15). Ductus receptaculi before vesicular area longer than this area, anterior portion in a funnel-like thickening; ductus receptaculi, adjacent to anterior annular flange, dilated (fig. 15). Pars intermedialis tubular, simple; capsula seminalis globose, teeth absent (fig. 15).

Measurements (n = 20): total length 7.89 (7.42–8.21); head length 2.03 (1.93–2.14); head width 2.03 (1.99– 2.09); length before eyes 1.1 (1.06–1.15); interocular width 1.32 (1.25–1.39); eye width 0.32 (0.3–0.36); antennal segments length: I 0.54 (0.51–0.64); II 0.8 (0.72–0.93); III 0.84 (0.79–0.91); IV 1.02 (0.95–1.14); V 1.28 (1.14– 1.38); pronotum length 2.12 (2.01–2.28), pronotum width 4.98 (4.64–5.2); pronotum width with spine 5.82 (5.6– 6.32); scutellum length 3.53 (3.27–3.78); scutellum width 3.51 (3.23– 3.78); abdomen length till VII segment 3.72 (3.51–3.92); abdomen width 5.47 (5.04–5.84).

Distribution. Brazil: Rio Grande do Sul (Esmeralda, São Francisco de Paula, Caxias do Sul, Caçapava do Sul, Pelotas).

Type material. Holotype ♂, BRAZIL, Rio Grande do Sul: São Francisco de Paula FLONA, 15.III. 2008, L. Weiler col. ( MCNZ).  Alotype ♀, same locality as holotype, 01.II. 2007, L. Weiler & B. B. Fürstenau col. ( UFRG).  Paratypes. Esmeralda ( Estação Ecológica de Aracuri ), 2 ♀, 18–19.III. 1981, J. Grazia col. ( UFRG);  same locality as holotype, ♂ ♀, 23.I. 1959, Pereira, Ditadi, Petersen, Meyer & Volkmer leg. ( UFRG);  13 3 ♀, 17–19.XII. 2005, V. C. Matesco & P. R. S. Bunde col. ( UFRG);  2 ♀, 29.I. 2006, J. L. C. Bernardes col. ( UFRG);  ♂ ♀, 08.IV. 2006, A. Ferrari & L. Weiler col. ( AMNH);  ♂, 09.VI. 2006, V. C. Matesco col. ( UFRG);  ♀, 31.I. 2007, L. Weiler & B. B. Fürstenau col. ( UFRG);  23 2 ♀, 18.III. 2007, C. F. Schwertner, L. Weiler & J. L. C. Bernardes col. ( UFRG);  ♂, 16.III. 2008, L. Weiler col. ( UFRG);  23, 06.III. 2010, L. Weiler col. ( UFRG);  Caxias do Sul ( Vila Oliva ), ♀, 19.II. 1954 ( MGAP),  ♀, 16.I. 1960 ( MGAP).  Caçapava do Sul ( Pedra do Segredo ), ♀, 05.IV. 2004, Bunde, Ferrari & Ely e Silva col. ( UFRG);  Pelotas, ♀, X. 1995, M. Schiower leg. ( UFRG). 

Comments. E. riograndesis  sp. nov. is very close to Euschistus (Lycipta) machadus  , differing from this species by the proportion of the genitalia structures in both sexes, these being smaller in the new species. Rolston (1982) mentioned the presence of three pairs of species in the subgenus, where the genitalia are virtually identical (sic) ( E. aceratos  and E. cribrarius  , E. circumfusus  and E. imitator  , E. triangulator  and E. picticornis  ); the genitalic similarity among those species arouses suspicion that the forms may represent disjunct variation of single species ( Rolston 1982). On the same line of thinking, E. machadus  and E. riograndensis  may form the fourth pair; E. machadus  is distributed in southeastern Brazil (Rio de Janeiro and São Paulo, according labels of Rolston’s type specimens), whereas E. riograndensis  occurs in southern Brazil (Rio Grande do Sul).


Brazil, Rio Grande do Sul, Porto Alegre, Museu de Ciencias Naturais da Fundacao Zoo-Botanica do Rio Grande do Sul


Brazil, Rio Grande do Sul, Porto Alegre, Universidade Federal do Rio Grande do Sul, Instituto de Biologia


USA, New York, New York, American Museum of Natural History


Brazil, Rio Grande do Sul, Porto Alegre, Museu Anchieta


Porto Alegre, Museu de Ciencias Naturais da Fundacao Zoo-Botanica do Rio Grande do Sul


Instituto de Biologia


American Museum of Natural History


Museu Anchieta