Orius (Orius) filiferus 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 : 1125-1128

publication ID	https://doi.org/ 10.1080/00222933.2015.1104393
DOI	https://doi.org/10.5281/zenodo.4332759
persistent identifier	https://treatment.plazi.org/id/EA370637-204E-0D39-4138-3205FB58F8E0
treatment provided by	Carolina
scientific name	Orius (Orius) filiferus Yamada and Yasunaga
status	sp. nov.

Treatment

Orius (Orius) filiferus Yamada and Yasunaga , sp. nov. ( Figures 1C View Figure 1 , 3A – D View Figure 3 , 5G,H View Figure 5 , 6D View Figure 6 , 9D View Figure 9 , 12A View Figure 12 , 15 View Figure 15 , 19D View Figure 19 )

Type materials

Holotype. ♂ ( Figures 3A, B View Figure 3 , 5G View Figure 5 , 12A View Figure 12 , 15 View Figure 15 ), Nakhon Nayok, Sarika Water Fall, N 14°18 ʹ 17.6 ʺ – 33.1 ʺ, E101°15 ʹ 18.2 ʺ – 27.8 ʺ, 62 – 76 m alt., 17 June 2009, K. Yamada ( DOA). Right and left antennal segment III and IV are missing . Paratypes. Thailand: Nakhon Nayok: 1♀, Wang Takhrai , 23 March 2010, K . Yamada ( TKPM); one ♂ ( Figure 9D View Figure 9 ), six ♀ (one in Figure 1C View Figure 1 , one in Figures 3C, D View Figure 3 , 6D View Figure 6 , 19D View Figure 19 , one in Figure 5H View Figure 5 ), same data as holotype (two ♀ in BMNH, one ♀ in DOA, one ♀ in TYCN, others in TKPM) .

Diagnosis

Recognised by the following characters: overall colouration greyish brown to blackish brown, head pale yellow to yellowish brown ( Figure 3A – D View Figure 3 ); legs pale yellow to yellowish brown ( Figure 3B, D View Figure 3 ); cone strongly rounded, elevated dorsally with weak projection; denticule lacking; flagellum very long, filamentous, much longer than four times maximum width of cone ( Figure 15 View Figure 15 ); copulatory tube very long, consisting of apical membranous section, weakly swollen middle section, and basal duct ( Figure 19D View Figure 19 ).

Description

Colouration. Overall colouration greyish brown to blackish brown ( Figure 3A – D View Figure 3 ). Head pale yellow to yellowish brown, but male with fuscous tinge posterior to ocelli; eyes reddish brown, area surrounding ocellus red to reddish brown. Antennae pale yellow to yellowish brown, with segment I dark brown ( Figure 5G, H View Figure 5 ). Labium uniformly pale yellow ( Figure 3B, D View Figure 3 ). Pronotum and scutellum greyish brown to blackish brown ( Figure 5G, H View Figure 5 ). Hemelytra greyish brown to blackish brown, cuneus somewhat darker than remaining area of corium; membrane uniformly somber dark brown ( Figure 3A, C View Figure 3 ). Legs pale yellow to yellowish brown ( Figure 3B, D View Figure 3 ). Venter of thorax and abdomen dark brown, tinged with darker orange brown ( Figure 3B, D View Figure 3 ).

Structure. Body elongate oval ( Figure 3A, C View Figure 3 ). Head smooth, shiny, about 0.65 times as long as width across eyes, and with a long erect fuscous seta on each side of clypeus, near anteromedial margin of each eye, and between eye and ocellus; ante-ocular portion 0.60 – 0.65 times as long as length of eye in dorsal view; vertex about 1.6 times as wide as eye in dorsal view; eye oblong, proximate to anterior margin of pronotum, about 1.3 times as long as eye width in dorsal view; neck indistinct ( Figure 9D View Figure 9 ). Antennal segment I stout, reaching apex of head, sparsely covered with short suberect setae; segment II 0.55 – 0.60 times as long as head width across eyes, densely covered with suberect setae which are about as long as width of the segment; segments III and IV a little narrower than maximum width of segment II, covered with long erect setae intermixed with short decumbent setae, longest seta much longer than width of respective segment; segment III shorter than segment IV ( Figures 5G, H View Figure 5 , 9D View Figure 9 ). Labium extending to the procoxae, sparsely covered with short suberect setae. Pronotum smooth, shiny, sparsely covered with short decumbent setae, and long stout fuscous corner setae; anterior margin slightly concave, width 1.3 times as wide as mesal length; lateral margin nearly straight, angulate at anterior corner; lateral carinae distinctly expanded; posterior margin shallowly concave, width 2.2 times as wide as anterior pronotal width; collar narrow, with transverse weak groove and a row of short setae, demarcated by shallow transverse impression from callus; callus polished, strongly convex, with scattered short setae, demarcated posteriorly by deep transverse impression ( Figures 5G, H View Figure 5 , 9D View Figure 9 ). Scutellum nearly equilateral, 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 1.9 times as wide as embolium; cuneal margin about 0.5 times as long as embolial margin; membrane with one visible vein located near costal margin. Ostriolar peritreme roundly curved forward; anterior area to median furrow in ostiolar peritreme smooth, much narrower than half width of posterior area to median furrow; posterior area squamous entirely; supracoxal area transversely rugose ( Figure 6D View Figure 6 ). Legs densely covered with decumbent setae; male protibiae with a row of 15 small fuscous teeth on ventral side.

Male genitalia ( Figures 12A View Figure 12 , 15 View Figure 15 ). Pygophore ovoid shaped, posteroventrally covered with 4 – 5 long, stout setae which are much shorter than half length of pygophore ( Figure 12A View Figure 12 ); mediodorsal surface densely distributed with short, suberect setae; cone strongly rounded in dorsal view, somewhat pointed at apex, elevated dorsally with weak projection ( Figure 15 View Figure 15 ); denticule lacking; flagellum very long, filamentous, much longer than four times maximum width of cone, extending well beyond the left edge of pygophore ( Figure 15 View Figure 15 ).

Female genitalia ( Figure 19D View Figure 19 ). Copulatory tube very long, arising from left part of intersegmental membrane between sterna VII and VIII in dorsal view, consisting of apical membranous section, weakly swollen middle section, and basal duct; apical

membranous section somewhat tubular, curved anteriorly, extending beyond the posterior marign of sterna VII; basal duct very long, stout, strongly curved.

Measurements (mm)

[♂ (n = 2)/ ♀ (n = 5), value for holotype male in parentheses]. Body length 1.60 – 1.65 (1.60)/1.50 – 1.70; head length (excluding neck) 0.21 – 0.22 (0.21)/0.21 – 0.23; head width across eyes 0.33 – 0.35 (0.35)/0.32 – 0.35; vertex width 0.15 – 0.16 (0.15)/0.16 – 0.17; width between ocelli 0.12 – 0.13 (0.12)/0.14 – 0.15; lengths of antennal segments I – IV: I – 0.08 (0.08)/0.08 – 0.09, II – 0.19 – 0.20 (0.20)/0.18 – 0.19, III – 0.15 (missing)/0.15 – 0.17, IV – 0.19 (missing)/0.19; lengths of labial segments II – IV: II – 0.06 – 0.07 (0.07)/0.08 – 0.09, III – 0.21 – 0.22 (0.21)/0.21 – 0.22, IV – 0.13 – 0.15 (0.13)/0.15 – 0.17; anterior pronotal width 0.27 – 0.29 (0.29)/0.26 – 0.29; mesal pronotal length 0.20 – 0.22 (0.22)/0.20 – 0.22; basal pronotal width 0.62 – 0.63 (0.62)/0.60 – 0.66; length of embolial margin 0.47 – 0.50 (0.50)/0.49 – 0.53; length of cuneal margin 0.25 (0.25)/0.25 – 0.28; maximum width across hemelytra 0.61 – 0.69/ 0.68 – 0.72.

Etymology

From Latin, fi liferus (= thread shaped), referring to very filamentous flagellum of paramere; an adjective.

Distribution

Northeastern Thailand (Nakhon Nayok).

Remarks

Judging from the description and illustrations by Muraleedharan and Ananthakrishan (1974), Orius fi liferus is similar in colouration to O. shyamavarna Muraleedharan and Ananthakrishnan, 1974 from India, but is distinguished from the latter by the strongly rounded cone (in shyamavarna , not rounded), the flagellum being much longer than four times maximum width of cone (in shyamavarna , about twice maximum width of cone), and the copulatory tube with anteriorly curved apical membranous section (in shyamavarna , apically with S-shaped curve). In having the paramere with very long filamentous flagellum, O. fi liferus is closely related to O. trivandrensis Muraleedharan and Ananthakrishnan, 1974 from India, but can be distinguished from it by the greyish brown to blackish brown pronotum (in trivandrensis , yellowish brown), the greyish brown to blackish brown hemelytra with somewhat darker cuneus (in trivandrensis , embolium and cuneus brown, clavus and corium pale brown), the more rounded cone, and the copulatory tube with anteriorly curved apical membranous section (in trivandrensis , apically not curved anteriorly).

Habitat

Collected on flowers of Macaranga sp. (Euphoribiaceae). One female specimen was found under the bract of a shoot of Macaranga tree, together with a plant bug species, Decomioides verecundus Yasunaga, 2010 ( Miridae : Phylinae : Phylini ) (cf. Yasunaga 2010).