Orius (Orius) taksini Yamada and Yasunaga, sp. nov.
Creators: name: Yamada, Kazutaka
name: Yasunaga, Tomohide
name: Artchawakom, Taksin
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Anthocoridae
Orius
Orius taksini

description: Orius (Orius) taksini Yamada and Yasunaga, sp. nov.
(Figures 2E – H, 5C,D, 6B, 9B, 11B, 14D – F, 19B)
Type materials
Holotype. ♂ (Figures 2E, F, 5C, 6B, 9B, 11B, 14D – F), THAILAND, Nakhon Ratchasima, Sakaerat Environmental Research Station, N 14°29ʹ24.4ʺ – 30ʹ37.5ʺ, E101°54ʹ37.8ʺ – 55ʹ49.7ʺ, 372 – 601 m alt., 23 – 25 January 2009, T. Yasunaga leg ’ (DOA). Paratypes. Thailand: Saraburi: one ♀ (Figure 19B), Kyusei Nature Farming Center, Champakpaew, Kaengkoi, 14°32ʹ75.8ʺN, 101°04ʹ71.5ʺE, 60 m alt., 20 January 2009, K. Yamada (TKPM); one ♀ (Figures 2G, H, 5D), same locality, T. Yasunaga (TKPM).
Diagnosis
Recognised by the following characters: hemelytra yellowish brown, cuneus widely darkened (Figure 2E, G); legs pale yellow, coxae and trochanters brown to blackish brown (Figure 2F, H); male antennal segment II much thickened, fusiform (Figures 5C, 9B); cone very thin, gradually acute apicad; denticule small, finger shaped; flagellum gently curved, exceeding the tip of cone (Figure 14D – F); copulatory tube very small, consisting of three distinct parts: apical membranous section, sclerotised cylindrical section, and basal duct (Figure 19B).
Description
Colouration. Head blackish brown, with pale yellow apex; eyes reddish brown, area surrounding ocellus reddish brown (Figures 2E, G, 5C, D). Antennae uniformly pale yellow, but male with apex of segment II and whole of segments III and IV with fuscous tinge (Figure 5C, D). Labium pale yellow; apex of segment IV somewhat fuscous (Figure 2F, H). Pronotum and scutellum uniformly blackish brown (Figure 5C, D). Hemelytra yellowish brown with cuneus widely darkened; membrane uniformly greyish brown (Figure 2E, G). Legs pale yellow; coxae and trochanters brown to blackish brown; tarsi pale yellow, with darkened apex (Figure 2F, H). Venter of thorax blackish brown. Abdomen brown to blackish brown (Figure 2F, H).
Structure. Body oblong oval (Figure 2E, G). Head smooth, shiny, about 0.7 times as long as width across eyes, sparsely covered with short decumbent setae, and with a longer erect seta on each side of clypeus, near anteromedial margin of each eye, and between eye and ocellus; ante-ocular portion 0.6 – 0.7 times as long as length of eye in dorsal view; vertex about 1.9 times as wide as eye in dorsal view in male, about 2.2 times in female; eye oblong, about 1.5 times as long as eye width in dorsal view; postocular portion constricted; neck shortened (Figure 9B). Antennal segment I stout, exceeding apex of head, sparsely covered with short suberect setae; segment II thickened, fusiform, 0.66 times as long as head width across eyes in male, 0.56 times in female, densely covered with suberect setae which are shorter than half width of the segment in male, a little shorter than width of the segment in female; segments III and IV narrower than maximum width of segment II, covered with long erect setae intermixed with short decumbent setae, longest seta about as long as width of respective segment; segment III equal length to segment IV (Figures 5C, D, 9B). Labium slightly exceeding the procoxae, sparsely covered with short suberect setae. Pronotum impunctate, shiny, sparsely covered with long decumbent setae; anterior margin slightly concave, width about 1.2 times as wide as mesal length; lateral margin nearly straight, curved at anterior corner in female; lateral carinae weakly expanded anteriorly; posterior margin shallowly concave, width 2.1 – 2.3 times as wide as anterior pronotal width; collar narrow, with transverse weak groove and suberect setae, demarcated by shallow impression from callus; callus strongly convex, impunctate, with scattered long setae, demarcated posteriorly by deep transverse impression (Figures 5C, D, 9B). Scutellum nearly equilateral, much shorter than basal width, depressed through middle, uniformly covered with long decumbent setae. Hemelytra impunctate, overall densely covered with short decumbent setae; maximum width of endocorium about twice as wide as embolium; cuneal margin about 0.5 times as long as embolial margin; membrane with single visible vein located near costal margin. Ostiolar peritreme similar in general shape to O. sakaerat; anterior area to median furrow in ostiolar peritreme smooth, a little wider than maximum width of posterior area to median furrow; posterior area weakly squamous entirely; supracoxal area smooth, without rugosity (Figure 6B). Legs densely covered with decumbent setae, male trochanters with one small tooth in ventral side; male protibiae with a row of 17 small fuscous teeth on ventral side.
Male genitalia (Figures 11B, 14D–F). Pygophore globular shaped but somewhat dorsoventrally depressed, posteroventrally covered with six long, stout setae intermixed with short, erect setae along outer margin, of which the longest setae are shorter than half length of pygophore (Figure 11B); mediodorsal surface densely distributed with short, suberect setae; cone very thin, gradually acute apicad (Figure 14D); denticule small, finger shaped, arising from inner side of cone (Figure 14D, E); flagellum gently curved, basally not adjacent to the paramere body, exceeding the tip of cone in dorsal view (Figure 14D – F).
Female genitalia (Figure 19B). Copulatory tube very small, fused on left part of intersegmental membrane between sterna VII and VIII in dorsal view, consisting of three distinct parts: apical membranous section, sclerotised cylindrical section, and basal duct; apical membranous section somewhat tubular; sclerotised cylindrical section thickened; basal duct very thin, merging into intersegmental membrane.
Measurements (mm)
[♂ (n = 1, holotype)/ ♀ (n = 2)]. Body length 1.65/1.85 – 1.90; head length (excluding neck) 0.24/0.24 – 0.25; head width across eyes 0.35/0.36 – 0.37; vertex width 0.16/0.18 – 0.19; width between ocelli 0.14/0.16; lengths of antennal segments I – IV: I – 0.08/0.09, II – 0.23/0.20 – 0.21, III – 0.18/0.16 – 0.17, IV – 0.18/0.17 – 0.18; lengths of labial segments II – IV: II – 0.09/0.09, III – 0.24/0.24 – 0.25, IV – 0.18/0.20; anterior pronotal width 0.31/0.31 – 0.32; mesal pronotal length 0.25/0.26 – 0.27; basal pronotal width 0.66/0.70 – 0.72; length of embolial margin 0.55/0.56 – 0.58; length of cuneal margin 0.29/0.29 – 0.35; maximum width across hemelytra 0.71/0.72 – 0.79.
Etymology
Named for the third author of this paper, Mr. Taksin Artchawakom, who greatly supported our field investigations; a noun in genitive case.
Distribution
Northeastern Thailand (Nakhon Ratchasima, Saraburi).
Remarks
In general appearance, Orius taksini resembles O. conchaconus Ghauri, 1972 from Pakistan and O. ugandensis Hernández & Stonedahl, 1999 from Uganda, but is distinguished from conchaconus by the presence of denticule (in conchaconus, lacking) and the gently curved flagellum (in conchaconus, strongly bifurcate), and from ugandensis by the very thin and gradually acute apex of cone (in ugandensis, wide and rounded) and the denticule arising from inner side of cone (in ugandensis, near outer margin of cone).
Habitat
Collected on flowers of Mangifera indica (Anacardiaceae) and on unidentified tropical broadleaved trees.
description: Published as part of Yamada, Kazutaka, Yasunaga, Tomohide & Artchawakom, Taksin, 2015, The flower bug genus Orius Wolff, 1811 (Hemiptera: Heteroptera: Anthocoridae: Oriini) of Thailand, pp. 1103-1157 in Journal of Natural History 50 on pages 1119-1122, DOI: 10.1080/00222933.2015.1104393, http://zenodo.org/record/3990373