Orius (Orius) tomokunii Yamada and Yasunaga

Yamada, Kazutaka, Yasunaga, Tomohide & Artchawakom, Taksin, 2015, The flower bug genus Orius Wolff, 1811 (Hemiptera: Heteroptera: Anthocoridae: Oriini) of Thailand, Journal of Natural History 50, pp. 1103-1157 : 1122-1125

publication ID	https://doi.org/ 10.1080/00222933.2015.1104393
DOI	https://doi.org/10.5281/zenodo.4332773
persistent identifier	https://treatment.plazi.org/id/EA370637-204B-0D36-4149-34F4FEC8FCB5
treatment provided by	Carolina
scientific name	Orius (Orius) tomokunii Yamada and Yasunaga
status	sp. nov.

Treatment

Orius (Orius) tomokunii Yamada and Yasunaga , sp. nov. ( Figures 2I – L View Figure 2 , 5E,F View Figure 5 , 6C View Figure 6 , 9C View Figure 9 , 11C View Figure 11 , 14G – I View Figure 14 , 19C View Figure 19 )

Type materials

Holotype. ♂ (NSMT-I-He 74275; Figures 2I, J View Figure 2 , 5E View Figure 5 , 9C View Figure 9 , 11C View Figure 11 , 14G – I View Figure 14 ), ( THAILAND), Maeo Khun Klang , 1300 m, Doi Inthanon, 18 October 1983, M. Tomokuni ’ ( NSMT). Left antenna is

missing. Paratypes. Thailand: Chiang Mai: 3♀, Pa Kia, Chiang Dao , 4 – 6 May 2000, S . Nagashima ( TKPM); one ♂, five ♀ (NSMT-I-He 74276-74281; one in Figures 2K, L View Figure 2 , 5F View Figure 5 , 6C View Figure 6 , one in Figure 19C View Figure 19 ), same data as holotype ( NSMT) .

Diagnosis

Recognised by the following characters: head with distinct neck ( Figures 5E, F View Figure 5 , 9C View Figure 9 ); hemelytra yellowish brown, cuneus widely darkened, not in clear contrast to yellowish brown endocorium ( Figure 2I, K View Figure 2 ); legs yellowish brown, meso- and metafemora sometimes fuscous at middle ( Figure 2J, L View Figure 2 ); antennal segment II 0.8 times as long as head width across eyes in male, 0.67 times in female ( Figures 5E, F View Figure 5 , 9C View Figure 9 ); cone very thin, gradually acute apicad; denticule slender and straight; flagellum straight, with rounded ventral projection near base ( Figure 14G – I View Figure 14 ); copulatory tube with tubular, long, membranous apical section and bulbous, shortened, weakly sclerotised basal section ( Figure 19C View Figure 19 ).

Description

Colouration. Head blackish brown, with pale yellow tylus; eyes reddish brown, area surrounding ocellus reddish brown ( Figure 5E, F View Figure 5 ). Antennae yellowish brown, segments I, III and IV with fuscous tinge ( Figure 5E, F View Figure 5 ). Labium blackish brown, apex of segment III and base of segment IV yellowish brown ( Figure 2J, L View Figure 2 ). Pronotum and scutellum uniformly blackish brown to black ( Figure 5E, F View Figure 5 ). Hemelytra yellowish brown with cuneus widely darkened, but cuneus without clear contrast in colouration to yellowish brown endocorium; membrane uniformly somber dark brown ( Figure 2I, K View Figure 2 ). Legs yellowish brown; meso- and metafemora sometimes fuscous at middle; tarsi pale yellow, with darkened apex ( Figure 2J, L View Figure 2 ). Venter of thorax blackish brown ( Figure 2J, L View Figure 2 ). Abdomen brown to blackish brown ( Figure 2J, L View Figure 2 ).

Structure. Body elongate oval ( Figure 2I, K View Figure 2 ). Head smooth, shiny, 0.70 – 0.75 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 0.66 times as long as length of eye in dorsal view in male, 0.8 times in female; vertex about 1.9 times as wide as eye in dorsal view; eye oblong, about 1.5 times as long as eye width in dorsal view; postocular portion constricted; neck distinct ( Figure 9C View Figure 9 ). Antennal segment I stout, exceeding apex of head, sparsely covered with short suberect setae; segment II 0.8 times as long as head width across eyes in male, 0.67 times in female, densely covered with suberect setae which are about 0.5 times as long as width of the segment in male, about as long as 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 in male, slightly longer than width of respective segment in female; segment III slightly shorter than segment IV ( Figures 5E, F View Figure 5 , 9C View Figure 9 ). Labium extending to the procoxae, sparsely covered with short suberect setae. Pronotum smooth, shiny, sparsely covered with short decumbent setae and tiny punctures; anterior margin nearly straight, width about as wide as mesal length in male, slightly narrower in female; lateral margin nearly straight; lateral carinae distinctly expanded, slightly bulging at callus; posterior margin shallowly concave, width 2.1 – 2.3 times as wide as anterior pronotal width; collar distinct, somewhat transversely rugose, demarcated by shallow transverse impression from callus; callus strongly convex, with scattered short setae, demarcated posteriorly by deep transverse impression ( Figures 5E, F View Figure 5 , 9C View Figure 9 ). Scutellum nearly equilateral, much shorter than basal width, deeply depressed through middle, sparsely covered with long decumbent setae. Hemelytra overall densely covered with short decumbent setae and tiny punctures; maximum width of endocorium about 1.8 times as wide as embolium; cuneal margin about 0.45 times as long as embolial margin; membrane with two visible and one indistinct veins; one visible vein located near costal margin, another visible vein near posterior margin of the membrane; one indistinct vein located between two visible veins. Ostiolar peritreme very wide, evenly curved forward; anterior area to median furrow smooth, about twice as wide as maximum width of posterior area to median furrow; posterior area narrow, squamous ranging from middle to forward; evaporative area very narrow ( Figure 6C View Figure 6 ). Legs densely covered with decumbent setae, male trochanters with one small tooth on ventral side; male protibiae with a row of 26 small fuscous teeth on ventral side.

Male genitalia ( Figures 11C View Figure 11 , 14G–I View Figure 14 ). Pygophore globular shaped but somewhat dorsoventrally depressed, posteroventrally covered with nine long, stout setae intermixed with short, erect setae along outer margin, of which the longest setae are shorter than half length of pygophore ( Figure 11C View Figure 11 ); dorsal surface densely distributed with short, suberect setae; cone very thin, gradually acute apicad ( Figures 14G View Figure 14 ); denticule slender and straight, apically blunt in lateral view, arising from inner side of cone, shorter than half of maximum width of cone ( Figure 14G, H View Figure 14 ); flagellum straight, with rounded ventral projection near base, a little exceeding the tip of cone in dorsal view ( Figure 14G – I View Figure 14 ).

Female genitalia ( Figure 19C View Figure 19 ). Copulatory tube fused on left part of intersegmental membrane between sterna VII and VIII in dorsal view, adjacent to base of ovipositor, consisting of apical membranous section and weakly sclerotised basal section; apical membranous section somewhat tubular, long; weakly sclerotised basal section bulbous, shortened.

Measurements (mm)

[♂ (n = 2)/ ♀ (n = 5), value for holotype male in parentheses]. Body length 2.35 – 2.38 (2.35)/2.55 – 2.95; head length (excluding neck) 0.31 (0.31)/0.31 – 0.33; head width across eyes 0.41 – 0.42 (0.42)/0.42 – 0.48; vertex width 0.21 (0.21)/0.21 – 0.24; width between ocelli 0.16 – 0.17/0.16 – 0.20; lengths of antennal segments I – IV: I – 0.11 (0.11)/0.11 – 0.13, II – 0.34 (0.34)/0.29 – 0.31, III – 0.25 (0.25)/0.18 – 0.22, IV – 0.26 (0.26)/0.23 – 0.25; lengths of labial segments II – IV: II – 0.08 (0.08)/0.08 – 0.09, III – 0.33 (0.33)/0.36 – 0.39, IV – 0.23 (0.23)/0.23 – 0.25; anterior pronotal width 0.34 – 0.35 (0.34)/0.35 – 0.39; mesal pronotal length 0.34 (0.34)/0.36 – 0.44; basal pronotal width 0.79 – 0.81 (0.79)/0.74 – 0.84; length of embolial margin 0.77 – 0.78 (0.77)/0.79 – 0.91; length of cuneal margin 0.41 – 0.42 (0.42)/0.42 – 0.49; maximum width across hemelytra 0.89 – 0.90/0.94 – 1.11.

Etymology

Named in honor of Dr. Masaaki Tomokuni, who collected most of the type specimens; a noun in genitive case.

Distribution

Northern Thailand (Chiang Mai).

Remarks

Orius tomokunii is similar to O. luridoides Ghauri, 1972 from Pakistan in colouration and shapes of head and pronotum, but is distinguishable from the latter by the cone being gradually acute apicad (in luridoides , obtuse apically) and the straight flagellum with rounded ventral projection near base and slightly exceeding the tip of cone (in luridoides , short and leaf like, its apex bifurcate, not exceeding the tip of cone).

Habitat

Unknown.