Sirthenea (Sirthenea) rodhaini Schouteden, 1913

Chłond, Dominik, 2018, A taxonomic revision of the genus Sirthenea (Hemiptera: Heteroptera: Reduviidae) of the Old World, Zootaxa 4520 (1), pp. 1-85 : 24-29

Sirthenea (Sirthenea) rodhaini Schouteden, 1913

( Figs. 41–54, 172 , 197 , Map 4)

Sirthenea rodhaini Schouteden, 1913: 238 . Holotype (♂): Congo [now Democratic Republic of Congo]: Sokele ; RMCA.

Sirthenea collarti Schouteden, 1931: 146 . Holotype (♂): Belgian Congo [now Democratic Republic of Congo]: Mayombe : Tschela; RMCA. Syn. nov.

Sirthenea angolana Villiers, 1958: 36 . Holotype: Angola; MNHN. Syn. nov.

Type material examined: Sirthenea (Sirthenea) rodhaini Schouteden, 1913 . Syntype, Ƌ: Holotypus; Musée du Congo / Sokele [printed] / 31-XII-1911 [partially handwritten] / Dr. Bequaert [printed]; R. Dét [printed] / D [handwritten] / 2453 [printed]; Sirthenea / Rodhaini / Sch. / Type [handwritten] (RMCA). Sirthenea (Sirthenea) collarti Schouteden, 1931 . Syntype, Ƌ: Holotypus [printed]; Museé du Congo / Mayombe [printed]:Tshela [handwritten] / 6-V-1924 [partially handwritten] / A. Collart [printed]; R. Dét. [printed] / G [handwritten] / 2453 [printed]; Sirthenea / collarti Sch. / Type [handwritten] (RMCA). Sirthenea (Sirthenea) angolana Villiers, 1958 . Syntype, ♀: Ang. 10625; Marco de Canavezes / Angola III-56; Type; Sirthenea / angolana / A. Villiers det. 1957 (MNHN).

Other material examined: Angola: ♀: Angola (A26) / Salazar, I.I.A.A. / 9–15.iii.1972; at light; Southern / African Exp. / B.M. 1972-I (NHMUK). Ƌ: Angola (A30) / 7 mls. W. Gabela / 16–18.iii.1972; at light; Southern / African Exp. / B M. 1972-I (NHMUK). Cameroon: Ƌ: Abong-Mbang [printed] / 2-V-68 [handwritten]; Muséum Paris / Cameroun / B. de Miré [printed]; Sirthenea / collarti / Schout [handwritten] / A Villiers det 1968 [partially hanwritten] (MNHN). Ƌ: N Koemuone / 24-VI-66 [handwritten]; Muséum Paris / Cameroun / B. de Miré [printed] (MNHN). Democratic Republic of Congo: Ƌ: Coll. Mus. Congo / Tshuapa: Ikela / 1956 / R. P. Lootens [printed] (RMCA). Brachypterous ♀: Coll. Mus. Congo / Mayidi / 1945 / Rév.P.Van Eyen [printed]; Sirthenea / collarti Sch. [handwritten] (RMCA). Brachypterous ♀: Coll. Mus. Congo / Mayidi / 1942 / Rév.P.Van Eyen [printed]; Sirthenea / collarti Scht / Det. Schouteden [handwritten] (RMCA). ♀: Biot. No 64 / Ilôt de forêt / marécag. Inondée [printed]; I.R.S.A.C.–Mus. Congo / Kwango: terr. De Feshi, / rive g. Kwenge II-1959 / B. 64 Mme J. Leleup [printed] (RMCA).

Diagnosis. Similar to S. africana , but easily distinguished by the following combination of characters: lack of pale markings on corium and membrane ( Figs. 41, 197 ), presence of 7 trichobothrial setae on pedicel ( Fig. 172 ), parameres of male with relatively short setae placed mostly on apical part of each paramere, left paramere visibly wider ( Figs. 47–50 ) than in S. africana .

Redescription: Color: Body black and brown with paler head, labium and legs ( Figs. 41, 42 , 197 ). Head light brown with setae of same color or slightly darker (females) and with dark stripe (reduced in some specimens) in lateral parts of head, from anterior margin of eye to apex of head (mostly in males). Clypeus of specimens with darker head is pale. Scape paler than head (females) or same color with darker apical part (males). Pedicel brown to dark brown. Basi- and distiflagellum pale with slightly darker base (males) or with visibly paler basal and apical parts (females). Intercalar segments pale. Ocelli rounded by thin dark annulus (brown to black). Pronotum bicolorous. Anterior pronotal lobe brown (darker than head). Posterior pronotal lobe and scutellum black or dark brown with paler anterior part as well as transversal suture. Scutellum and hemelytron dark brown to black, hemelytron with delicately paler basal part (brachypterous females with pale basal part of costal vein). Ventral part of thorax dark brown to black, with paler metasterna. Abdomen ventrally dark brown to brown with a pale, longitudinal spot in middle. Connexives with irregular black spots (some specimens with delicate pale markings on external margin), those of seventh segment as well as apical part of connexives of second segment pale. Tip of abdomen pale (females) or dark (males).

MAP 4. Distribution of Sirthenea rodhaini Schouteden, 1913 .

Structure: Body slender, medium sized. Head and pronotum shiny. Head with dense, variably-sized (mostly long) setae and a two pairs of trichobothrial setae as well as shallow apodeme depression and transversal furrow. Hairless area of head distinctly bigger in females. Anteocular part of head 3.33–3.42 times longer than postocular part in females and 2.67–2.8 times in males. Eyes and ocelli large, but narrower than synthlipsis in dorsal view and with S-curvature of posterior margin in lateral view. Dorsal surface of antennifers smooth. Scape club-shaped, short, covered by erect setae. Pedicel with dense, adherent, short setae and 7 long trichobothrial setae ( Fig. 172 ). Basi- and distiflagellum with short adherent setae and numerous longer, regularly arranged, erect setae. Second visible labial segment enlarged basally, reaching posterior margin of head. Anterior pronotal lobe with distinct sulci, long and thin apodeme depression as well as without collar. APL in most of brachypterous females same width or wider than posterior pronotal lobe. Ridges of proepisternum and proepimeron are connected in entire length. Transversal suture of pronotum with visible triangular curvature in middle and in place of contact with latero-external sulcus. Posterior pronotal lobe slightly depressed in middle (triangular shape, distinctly visible in most of males). Lateral parts of posterior pronotal lobe with transversal sculpturation. Margins of scutellum thickened and shining with dense, mostly long setae. Tibia and tarsus with spine-like setae (mostly on inner side). All legs with visible long trichobothrial setae, located on outer side of femur and tibia. Females macropterous and brachypterous, males macropterous. Hemelytron surpassing apex of abdomen (males) or not reaching apex of abdomen (females). Corium dull with shining basal part and costal margin. Abdomen ventrally with medium-sized and dense setae and spiracles III–IV placed distant from ventral connexival suture. A few distinct trichobothria visible on female terminalia.

Genitalia: Male—Median process of pygophore ( Fig. 46 ) with rounded apical part and very small tapered apex ( Fig. 51 ). Both parameres slender with medium-sized setae on outer side and inner side, and with sharp apices ( Figs. 47–50 ). Right paramere distinctly emarginated medially on inner view ( Fig. 49 ). Pedicel relatively robust and bent laterally ( Figs. 53, 54 ). Basal lobe of dorsal phallothecal sclerite enlarged on right side ( Fig. 52 ). Dorsal endosomal sclerite corrugated ( Fig. 54 ).

Female—Valvifer I subquadrangular with curvature on posterior margin and dense, short setae on outer side ( Fig. 45 ). Styloids on inner margin with dense, short setae and with sharp apex, inner margins curved on more than 1/3 of length ( Fig. 43 ). Basal part of valvula II with process convolute inwards and forked ( Fig. 44 ). Apical part with one small sharp process and distinctly rounded apex ( Fig. 44 ).

Measurements (in mm, male in parentheses, brachypterous females in square bracket): Body length: 21.5– 24.4 (16.5–18.5) [18.8–19.0]; maximum width of abdomen: 4.1–4.4 (3.4–4.3) [3.5–3.6]; head length: 4.1–4.7 (3.0– 3.6) [3.7–4.0]; head width: 2.4–2.7 (1.6–2.5) [2.2–2.5]; length of anteocular part: 2.3–2.6 (1.6–2.1) [2.3–2.3]; length of postocular part: 0.6–0.8 (0.6–0.8) [0.7]; length of synthlipsis: 1.2–1.3 (0.9–1.0) [1.0–1.1]; interocellar distance: 0.6–0.8 (0.4–0.6) [0.6–0.7]; length of antennal segments I:II:III:IV: 1.5–1.6 (1.0–1.5) [1.3–1.4]: 2.1–2.8 (2.0–2.3) [1.9–2.0]: 1.7–2.1 (1.5–1.8) [missing]: 2.2 (1.9–2.0) [missing]; length of visible labial segments I:II:III: 1.2–1.3 (0.7–1.0) [0.7–1.0]: 3.2–3.4 (2.1–3.0) [2.6–3.2]: 1.6–2.2 (1.3–1.9) [1.5–2.0]; maximum length of anterior pronotal lobe: 3.2–3.8 (2.4–2.8) [3.2]; maximum length of posterior pronotal lobe: 1.6 (1.3–1.5) [1.3–1.5]; maximum width of anterior pronotal lobe: 3.8–4.6 (2.8–3.5) [3.7–3.9]; maximum width of posterior pronotal lobe: 4.3–5.3 (3.5–4.0) [3.5–3.8]; length of scutellum: 2.2–2.7 (1.2–1.5) [1.8–2.1]; length of hemelytron: 13.4–14.0 (10.8–11.7) [5.2–5.5].

Distribution: Angola, Cameroon, Democratic Republic of Congo (Map 4).

Comments: Females of S. rodhaini are occasionally brachypterous ( Fig. 42 ), they differ from macropterous individuals by shortened wings, the whitish basal part of costal vein, the distinctly enlarged anterior and the reduced posterior pronotal lobe.

Figures

FIGURE 42. Sirthenea rodhaini Schouteden, 1913—brachypterous female, dorsal habitus.

FIGURES 169–182. Trichobothrial setae on pedicel: 169—Sirthenea africana Distant, 1903; 170—S. flaviceps (Signoret, 1860); 171—S. picescens Reuter, 1887; 172—S. rodhaini Schouteden, 1913; 173—S. caiana Chłond, 2008; 174—S. dimidiata Horváth, 1911; 175—S. flavipes (Stål, 1855); 176—S. kali sp. nov.; 177—S. nigronitens (Miller, 1958); 178—S. nitida Chłond, 2008; 179—S. nigra Cai & Tomokuni, 2004; 180—S. setosa sp. nov.; 181—S. laevicollis Horváth, 1909; 182—S. obscura (Stål, 1866).

FIGURES 197–200. Color figures of habitus: 197—Sirthenea rodhaini Schouteden, 1913; 198—S. caiana Chłond, 2008; 199—S. dimidiata Horváth, 1911, male; 200—S. dimidiata, female.

FIGURES 43–54. Sirthenea rodhaini Schouteden, 1913: 43—styloids, outer view; 44—gonapophysis of VIII segment, inner view; 45—gonocoxite of VIII segment, inner view; 46—pygophore, dorsal view; 47—left paramere, inner view; 48—left paramere, outer view; 49—right paramere, inner view; 50—right paramere, outer view; 51—median process of pygophore, lateral view; 52—phallus, right lateral view; 53—phallus, left lateral view; 54—phallus, dorsal view.