Stenorhamphus segerak Smith & Hwang & Weirauch 2019, new species
Creators: name: Smith, Samantha
name: Hwang, Wei Song
name: Weirauch, Christiane
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Reduviidae
Stenorhamphus
Stenorhamphus segerak

description: Stenorhamphus segerak, new species
(Figs. 1, 2, 4, 5A, 6 A–D, 7A, B, E–G)
Diagnosis. Recognised within Stenorhamphus by the relatively small total length (5.7 mm), two pairs of stout setae posterior to the eye, spines on the trochanter, fascicle of stout setae on the anterior area of the gena postocular region developed, posterior lobe of pronotum longer than anterior, almost covering metanotum, legs long, mid and hind coxae longer than length of abdomen, forecoxa extending past pronotum, two spines on posterior lobe of pronotum.
Description. Male: small (total length, holotype: 5.7 mm) COLOURATION: general colouration brown, with posterior pronotal lobe, pygophore, postocular region and wings darker brown, abdomen, forecoxa and anterior region of head yellowish (Figs. 2A, B). Head: postocular region dark brown with spots, anterior anteocular region yellow (Figs. 4A, B). Antenna: brown, flagellomeres light brown. Labium: light brown. Thorax: brown, posterior pronotum darker. Legs: Coxae light brown to yellow, trochanters, femora, tibiae, and tarsi pale brown. Wings: uniformly dark brown. Abdomen: tergites pale brown; mediosternites pale brown, laterosternites somewhat darker; pygophore dark brown. VESTITURE: as in genus description with the following differences: Head: ventral surface with four pairs of long, stout setae located posterior to antennifer, at anterior and posterior margins of eye (Figs. 4A, B), fascicle of more than twelve stout setae on gena ventrad of apex of maxillary plate (Fig. 4B), two pairs of stout setae dorsolaterally posterior to eye (Fig. 4B); second labial segment (first visible) with fascicle of medium-length stout setae on ventral surface in apical half of segment (Fig. 4B); Legs: posterodorsal series and four stout, long setae anteroventral, one stout, long seta posteroventral (Figs. 4A, F), foretrochanter with five stout setae on anterior surface (Fig. 4A), ventral surface of forefemur with about 13 medium and long, stout setae in basal 3/4, interspersed with short setae (Fig. 4A). STRUCTURE: as in genus description with the following differences: Head: (Figs. 4A, B, H): Eyes: globulose and subhemispheric in dorsal perspective (Fig. 4A, H), oval in lateral view, reaching dorsal surface of head, almost reaching ventral surface of head (Figs. 4A, B). Antenna: extremely long, slender; scapus (directed posteriad) surpassing hind coxa (Figs. 2A, B). Labium (Figs. 4A, B). Thorax (Figs. 4F, G, H): collar of pronotum pronounced, posterior lobe of pronotum slightly wider than long, distinctly wider than anterior lobe, slightly depressed medially and with raised, spined, lateral areas in posterior half of lobe, posterior margin concave (Figs. F, H). Mesoscutellum subrectangular, lateral edge a rounded ridge (Fig. 4G). Legs (Figs. 4A, C, D). Wings (Figs. 5A): basal cell trapezoidal, rmcu cross vein absent (Fig. 5A). Abdomen (Figs. 2A, B, 4E): Genitalia (Figs. 6A, B, C, D, 7A, B, E, F, G): pygophore elongate ovoid, with spine-like medial process, transverse bridge present (Figs 6A, B, C, D); parameres slender, curved, apex rounded (Figs. 6A, B, C, D, 7B); aedeagus (Figs. 7A, F, G) with basal plates stout and strongly curved, a relatively large capitulate process, ponticulus basilaris slender or nonexistent, basal plate extension relatively short (Figs. 7A, F, G), basal plate struts short (Figs. 7A, G), phallothecal sclerite curved, more heavily sclerotised anteriorly and posteriorly (Fig. 7A), endosoma with sclerotised ventral and lateral lobes with small spicules (Fig. 7A), lateral lobes long, phallosoma laterally with heavily sclerotised lobe, with short, stout spicules (Fig. 7E).
Measurements. See Table 1.
Female. Unknown.
Etymology. Named after the collecting locality of the holotype at Nanga Segerak in Sarawak; a noun in apposition.
Distribution. Only known from the type locality.
Biology. Found in lowland dipterocarp forests at mid elevation.
Type material. Holotype: male, Malaysia, Sarawak, Lubok Antu District, Lanjak Entimau Wildlife Sanctuary, Nanga Segerak, 1.4200°N, 112.0044°E, 506 m, yellow pan trap, Hwang et al., 16–17 Oct 2017 [SW17 L46] (RCW 5465), type currently deposited in National University of Singapore, Lee Kong Chian Natural History Museum, Zoological Reference Collection (ZRC).
Discussion. Most closely related to Stenorhamphus nubiferus and S. phuphan, with which this species shares the presence of a pair of ventral setae in position 5, lateral to the eye (9:1). Distinguished from these two species by the presence of a pair of ventral setae in position 4 (8:1) and a pair of spines on the posterior pronotal lobe (17:1).
description: Published as part of Smith, Samantha, Hwang, Wei Song & Weirauch, Christiane, 2019, Synonymy of Mangabea and Stenorhamphus, with the description of two new species (Hemiptera: Reduviidae: Emesinae: Collartidini), pp. 135-149 in Raffles Bulletin of Zoology 67 on pages 145-148, DOI: 10.26107/RBZ-2019-0011, http://zenodo.org/record/3677265