Parastalius rolstoni, Matesco, Viviana Cauduro, Grazia, Jocélia & Campos, Luiz Alexandre, 2007

Matesco, Viviana Cauduro, Grazia, Jocélia & Campos, Luiz Alexandre, 2007, Description of new genus and species of Ochlerini from Central America (Hemiptera: Pentatomidae: Discocephalinae) ¹, Zootaxa 1562, pp. 63-68 : 66-68

Parastalius rolstoni sp. nov.

( Figs. 4–10 )

Stalius trisinuatus ; Campos and Grazia, 2006: 154 (list) nec Rolston, 1992.

Etymology: the species is named in honor of Dr. Lawrence H. Rolston for his inestimable contributions to the knowledge of Neotropical pentatomids.

Type locality: Costa Rica: Buenos Aires, El Lano, and Quebrada Segunda.

Holotype male with following labels:

a) Buenos Aires, PILA, Sector Altamira ., A. C. Amistad , Prov. Punta , COSTA RICA. 1150–1400 m. May 1994, R. Delgado, L S; 572100_331700 ; # 2905; b) COSTA RICA; INBIO; CRI001; 860020. Deposited in INBC.

Paratype females with following labels:

Female - El Lano, Prov. Cartago, COSTA RICA, enero1981, R. Céspedes, Museo de Insectos Universidad de Costa Rica ( MUCR); female – Quebrada Segunda, Ref. Nac. Fauna Silv. Tapanti, Prov. Cartago, COSTA RICA, 1250 m, abril 1992, LN194000, 560000. COSTA RICA, INBIO, CR1000, 459431 ( UFRG).

Description. General color rusty black, except following yellowish: labium, legs distal half of antennal segment IV, entire segment V. Body oval. Dorsal and ventral surfaces punctured in black.

Head surface with short setae over tylus and juga; juga slightly longer than tylus. Process of antennifer tubercle produced forward and downwards obscuring in side view half of antennal segment I. Anteocular length about 0.6 to 0.7 times width of head across eyes. Antennal segments covered by long setae, these as long as segments’ width. Antennal segments III, IV, V increasing in length; segment II the shortest, about half of III; segment I slightly longer than II. Apex of labium reaching anterior margin of urosternite VII.

Thorax. Pronotum densely punctured near anterior margin. Scutellum more finely punctured and with short setae; wrinkled surface before frenal constriction, smooth after constriction. Corium covered by short setae, these denser near lateral margin. Inconspicuous spot at the end of radial vein. Femora with numerous discoid brown spots.

Abdomen. Ventral surface rusty black, trichobothria pale. Each urosternite with narrow unpunctured, smooth, dark reddish lateral stripe.

Female. Measurements (n=2). Body length 11.00; abdominal width 6.80; head length 2.04 (2.00–2.08), width 2.16; interocular distance 1.20; length of antennal segments: I 0.84 (0.80–0.88), II 0.78 (0.76-0.80), III 1.56, IV 1.68, V 2.00; pronotum length 2.92, width 6.40; scutellar length 5.20, width 4.12 (4.08–4.16). Genitalia (figs. 4–5). Gonocoxites 8 (gc8) strongly convex with surface slightly wrinkled. Sutural margins parallel. Laterotergites 8 (la8) subtriangular; laterotergites 9 (la9) tumid at mesial 1/3, wrinkled and excavated at lateral 2/3; inner margins of laterotergites 9 rounded, leaving apex of proctiger (X) and pseudosternite (gc9) uncovered. Pseudosternite (gc9) triangular partially fused with laterotergites 9. Chitinellipsen (ch) ellipsoidal. Thickening of vaginal intima (tvi) conical and weakly sclerotized. Ductus receptaculi: vesicular area (va) spindle-shaped; ductus receptaculi (dre), before vesicular area, longer and narrower than ductus after vesicular area. Pars intermedialis (pi) longer than wide, barrel-shaped; annular flanges (aaf, paf) directed posteriorly. Capsula seminalis (cs) semispherical with three apical narrow teeth, these sometimes branched.

Male. Measurements (n=1). Body length 8.91; abdominal width 5.92; head length 1.76, width 2.16; interocular distance 1.12; length of antennal segments: I 0.88, II 0.64, III 1.40, IV 1.56, V missing; pronotum length 2.40, width 5.52; scutellar length 4.28, width 3.52. Genitalia. Pygophore (figs. 6, 7) subtrapezoidal. Oval processes (gp) shorter than in P. trisinuatus . Parameres (par) almost attaining postrerolateral angles of pygophore, surpassing oval processes laterally. Phallus (figs. 8–10) thickened and almost spherical. Vesica (v) nearly as long as phallotheca (ph), rigid, closely attached to ductus seminis distalis (dsd), unarticulated, with a pair of winglike basal projections (vbp). Apical aperture of vesica beveled.

Distribution: Costa Rica.

Comments. Parastalius rolstoni sp. nov. can be distinguished from P. trisinuatus by the morphology of the male genitalia. The pygophore of P. rolstoni is subtrapezoidal and the parameres surpass the oval processes laterally. In P. trisinuatus the pygophore is subquadrangular and the parameres do not surpass the oval processes.

Figures

FIGURE 4 – 10. Parastalius rolstoni sp. nov., female and male genitalia. Figs. 4 – 5, female genital plates and receptaculum seminis, ventroposterior and ventral views respectively. (aaf = anterior annular flange; ch = chitinellipsen; cs = capsula seminalis; dre = ductus receptaculi; gc 8 = gonocoxites 8; gc 9 = gonocoxites 9; la 8 = laterotergites 8; la 9 = laterotergites 9; mw = median wall of the ductus; paf = posterior annular flange; sp = spiracle; tvi = thickening of vaginal intima; X = proctiger). Figs. 6 – 7, pygophore, dorsal and ventral views respectively. (gp = genital cup process; dr = dorsal rim; par = paramere; vr = ventral rim). Figs. 8 – 10, phallus, dorsal, ventral and lateral views respectively. (dsd = ductus seminis distalis; ph = phallotheca; v = vesica; vbp = vesica basal process). Scales = 0.5 mm.