Sirthenea (Sirthenea) setosa, 2018

Chłond, Dominik, 2018, A taxonomic revision of the genus Sirthenea (Hemiptera: Heteroptera: Reduviidae) of the Old World, Zootaxa 4520 (1), pp. 1-85 : 61-64

Sirthenea (Sirthenea) setosa sp. nov.

( Figs. 122–130 , 180 , 207 , Map 12)

Type material: Holotype, Ƌ: (4) [handwritten]; unidentified host / Quoin hill, Tawau / collector G. T. Lim / Date: April 1981 [handwritten on grey label]; C.I.E. Coll. [printed] / A. 13088 [number handwritten, small yellow label]; Sirthenea sp. [handwritten] / det. M.S.K. Ghauri, 1983 [printed, part of date handwritten] ( NHMUK).

Diagnosis. This species can be easily recognized among other species from the Oriental Region by the following combination of characters: very dense and relatively long vestiture, U-shaped posterior margin of an eye in lateral view, deep apodeme depression of the head, eyes wider than synthlipsis, distinct collar on anterior pronotal lobe, ridges of proepisternum and proepimeron connected in entire length, very long median process of pygophore (similar to representatives of the subgenus Monogmus ) as well as characteristic shape of parameres and dorsal phallothecal sclerite.

Description: Color: Body brownish black with pale yellow markings on basal part of hemelytron, yellow legs and golden setae ( Figs. 122 , 207 ). Head dark brown with paler basal area of clypeus and interocular furrow. Eyes dark brown. Ocelli not pigmented. Scape, pedicel and first visible labial segment, pronotum and scutellum dark brown. Intercalar antennal segments, second and third visible labial segments, lateral parts of posterior pronotal lobe of pronotum paler. Hemelytron dark brown with pale yellow markings on basal part. Clavus dark brown. Membrane slightly darker than corium. Coxa brown, with darker markings and paler apical part. All legs yellow, only middle and hind tibia slightly darker. Connexives with whitish external margin in ventral view. Pygophore with paler parameres.

Structure: Body large, slender. Head strongly elongated. Head, pronotum and scutellum with very long and dense setae. Dorsal surface of antennifers corrugated. Scape not reaching apex of head, thickened distally with 6 long trichobothrial setae ( Fig. 180 ). Second visible labial segment strongly elongated (1.33 times longer than first and trhird segments together), reaching apical part of anterior pronotal lobe. Eyes and ocelli large. Eyes wider than synthlipsis with U-curved posterior margin in lateral view. Apodeme depression and transcersal furrow of head deep. Margins of pronotum with medium sized, dense setae. Anterior pronotal lobe sculptured with very distinct and very wide granulated, strongly pilose sulci and with distinct collar. Sulci of anterior pronotal lobe with very long and dense setae. Apodeme depression of anterior pronotal lobe short and wide. Posterior pronotal lobe weakly hollowed in middle of anterior margin. Middle part of posterior pronotal lobe with very distinct longitudinal sculpturation, covered by dense, long setae. Metapleura with two complete ridges. Scutellum with enlarged lateral margins. Fore legs with very dense, medium sized setae. Hemelytron dull with long, dense setae, slightly surpassing apex of abdomen. Costal vein with very dense, short setae. Membrane dull with distinctly wrinkled (transversally) apical external cell. Spiracles III–IV placed close to ventral connexival suture.

Genitalia: Median process of pygophore strongly elongated and stout, gradually narrowing to apex ( Fig. 123 ). On right side of median process with a small nodule covered by relatively long setae visible on margin of pygophore. Both parameres subtriangular with distinctly enlarged apical part and covered by dense, various sized

MAP 12. Distribution of Sirthenea setosa sp. nov.

setae and sharp apices ( Figs. 124–127 ). Right paramere distinctly wider in apical part ( Figs. 126, 127 ). Left paramere elongated and distinctly thinner than right paramere ( Figs. 124, 125 ). Pedicel short, placed assymetrically ( Figs. 128, 129 ). Dorsal phallothecal sclerite, tongue–like with smooth surface, placed on right side of aedeagus ( Figs. 128–130 ).

Measurements (in mm): Body length: 20.2; maximum width of abdomen: 4.2; head length: 3.9; head width: 2.1; length of anteocular part: 2.4; length of postocular part: 0.8; length of synthlipsis: 0.7; interocellar distance: 0.3; length of visible antennal segments I:II:III:IV: 1.4: 2.6: missing: missing; lengths of labial segments I:II:III: 0.9: 3.2: 1.5; maximum length of anterior pronotal lobe: 3.1; maximum length of posterior pronotal lobe: 2.1; maximum width of anterior pronotal lobe: 2.9; maximum width of posterior pronotal lobe: 4.1; length of scutellum: 1.6; length of hemelytron: 12.4.

Female: Unknown.

Distribution: Malaysia (Borneo: Sabah: Tawau) (Map 12).

Comments: This species has characteristic parameres and median process of the pygophore, very similar in shape to the condition found in representatives of the subgenus Monogmus as well as the Australian species S. obscura . However, it does not exhibit skeletal characters of the subgenus Monogmus , as its scape does not reach the apex of the head, its eyes are large, wider than synthlipsis, the posterior margin of an eye is U-shaped, and sulci are very distinct.

Etymology: The name of this species originate from its very dense and long vestiture.

Figures

FIGURE 122. Sirthenea setosa sp. nov.—dorsal habitus.

FIGURES 123–130. Sirthenea setosa sp. nov.: 123—pygophore, dorsal view; 124—left paramere, inner view; 125—left paramere, outer view; 126—right paramere, lateral view; 127—right paramere, outer view; 128—phallus, right lateral view; 129—phallus, left lateral view; 130—phallus, dorsal view.

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 205–208. Color figures of habitus: 205—Sirthenea nitida Chłond, 2008; 206—S. nigra Cai & Tomokuni, 2004; 207—S. setosa sp. nov.; 208—S. obscura (Stål, 1866).