Orius (Dimorphella) maxidentex Ghauri 1972
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 maxidentex

description: Orius (Dimorphella) maxidentex Ghauri, 1972
(Figures 4A – D, 5M,N, 7A, 8A – C, 10B, 13A, 18A – C, 20A)
Orius (Dimorphella) maxidentex Ghauri, 1972: 414. Holotype. ♂, Hangu, West Pakistan (BMNH) [examined]; Muraleedharan 1977: 234 (diagnosis, key); Kernasa et al. 2008: 1 (biology); Erfan et al. 2010: 341 (record, note, figure).
Specimens examined
Thailand: Nakhon Ratchasima: one ♂, three ♀, Horticultural Experimental Station, Bandon, Murang, 18 March 2010, K. Yamada. Saraburi: two ♂ (one in Figure 18A – C), Kyusei Nature Farming Center, Champakpaew, Kaengkoi, 14°32 ʹ 75.8 ʺ N, 101°04 ʹ 71.5 ʺ E, 60 m alt., 20 January 2009, K. Yamada. Nakhon Nayok: four ♂ (one in Figures 7A, 8A – C, 13A) 12 ♀, Sarika, 14°17 ʹ 20.8 ʺ – 18 ʹ 37.8 ʺ N, 101°17 ʹ 20.5 ʺ – 58.6 ʺ E, 25 – 37 m alt., 6 March 2009, T. Yasunaga; five ♂ (one in Figure 4A, B, one in Figures 5M, 10B) five ♀ (one in Figure 4C, D), same locality, 21 – 23 March 2010, K. Yamada. Suphan Buri: four ♀ (one in Figure 5N, one in Figure 20A), Sri Prachan, 14°41 ʹ 18.3 ʺ N, 100°08 ʹ 25.8 ʺ E, 10 m alt., 21 January 2009, K. Yamada and T. Yasunaga. Ayutthaya: one ♀, Rajamangala Univ. of Technology Suvarnabhumi, Hantra Campus, 14°22 ʹ 30.5 ʺ – 39.9 ʺ N, 100°36 ʹ 07.0 ʺ – 23.7 ʺ E, 10 – 20 m alt., 24 October 2008, K. Yamada. Bangkok: one ♀, Ramkamhaeng, Prawet, 19 June 2009, K. Yamada. All in TKPM.
Diagnosis
Recognised by the following characters: hemelytra semitransparent pale yellow, cuneus apically darkened (Figure 4A, C); anterior area to median furrow in ostiolar peritreme very narrow (Figure 7A); male profemora with 3 – 4 small fuscous teeth on ventral side (Figure 8C); cone obtuse at apex (Figure 18A); flagellum gently curved (Figure 18A); lamelliform process widened, arising near the base of flagellum (Figure 18A – C); copulatory tube extremely stout, consisting of membranous apical section and strongly curved, tubular, basal section (Figure 20A).
Redescription
Colouration. Head blackish brown to black; eyes reddish brown, ocellus and its surrounding area red to reddish brown. Antennae pale yellow; segments III and IV with fuscous tinge (Figure 5M, N). Labium blackish brown; apex of segment III and base of segment IV yellowish brown (Figure 4B, D). Pronotum and scutellum blackish brown to black (Figure 5M, N). Hemelytra semitransparent pale yellow, with cuneus apically darkened; membrane semitransparent greyish brown (Figure 4A, C). Legs uniformly pale yellow; coxae generally blackish brown (Figure 4B, D). Venter of head and thorax blackish brown tinged with orange brown distally (Figure 4B, D).
Structure. Body small, oblong oval (Figure 4A, C). Head about 0.7 times as long as width across eyes, densely punctate with very short setae; ante-ocular portion 0.6 times as long as length of eye in dorsal view; vertex about twice width of eye in dorsal view; eye oblong, about 1.6 times as long as eye width in dorsal view, proximate to anterior margin of pronotum; neck indistinct (Figure 10B). Antennal segment I stout, slightly exceeding apex of head, sparsely covered with short suberect setae; segment II thickened, 0.5 – 0.6 times as long as head width across eyes, densely covered with suberect setae which are shorter than half width of the segment; segment III and IV narrower than maximum width of segment II, densely covered with suberect setae which are shorter than width of respective segment; segment III about 0.8 times as long as segment IV (Figures 5M, N, 10B). Labium reaching the procoxae, sparsely covered with short suberect seatae. Anterior pronotal margin slightly concave, width a little longer than mesal length; lateral margin slightly sinuate; lateral carinae expanded at anterior two-thirds; posterior margin shallowly concave inwardly, width 2.2 – 2.3 times as wide as anterior pronotal width; callus weakly convex, scattered short setae and deep punctures, density of setae and punctures slightly less than that of O. tantillus (Figures 8A, B, 10B). Maximum width of endocorium about twice as wide as embolium; cuneal margin about 0.50 – 0.55 times as long as embolial margin; membrane with one distinct vein near costal margin and one obscure vein at middle. Ostiolar peritreme wide; anterior area to median furrow in ostiolar peritreme smooth, very narrow; posterior area to median furrow strongly squamous entirely, wider than twice maximum width of anterior area to median furrow; evaporative area very narrow, narrower than maximum width of ostiolar peritreme; supracoxal area smooth, without rugosity (Figure 7A). Male trochanters with one small fuscous tooth on ventral side (Figure 8C); male profemora with 3 – 4 small fuscous teeth on ventral side; male protibiae with a row of 20 – 22 small fuscous teeth on ventral side (Figure 8C).
Male genitalia (Figures 13A, 18A–C). Pygophore globular shaped but somewhat dorsoventrally depressed, posteroventrally covered with 5 – 7 long, stout setae which are much shorter than half length of pygophore (Figure 13A); mediodorsal surface distributed with short, suberect setae, and with a row of short, stout setae along the edge that fits the flagellum (Figure 13A); cone thin, obtuse at apex in dorsal view (Figure 18A); flagellum gently curved, situated upper (outer) side from lamelliform process, slightly longer than maximum width of cone, extending near the left edge of pygophore (Figure 18A – C); lamelliform process arising near the base of flagellum, widened, extending distally along the curvature of cone, apically sinuate in dorsal view (Figure 18A).
Female genitalia (Figure 20A). Copulatory tube extremely stout, fused on mesal part of intersegmental membrane between sterna VII and VIII in dorsal view, adjacent to base of ovipositor, consisting of membranous apical section and strongly curved, tubular basal section.
Measurements (mm)
[♂ (n = 5)/ ♀ (n = 5)]. Body length 1.63 – 1.80/1.75 – 2.05; head length (excluding neck) 0.24 – 0.26/0.25 – 0.28; head width across eyes 0.34 – 0.38/0.36 – 0.39; vertex width 0.16 – 0.19/0.17 – 0.20; width between ocelli 0.14 – 0.17/0.17 – 0.19; lengths of antennal segments I – IV: I – 0.09/0.09, II – 0.20 – 0.21/0.18 – 0.21, III – 0.16 – 0.17/0.14 – 0.16, IV – 0.18 – 0.21/0.16 – 0.19; lengths of labial segments II – IV: II – 0.06 – 0.08/0.08 – 0.09, III – 0.23 – 0.24/0.24 – 0.26, IV – 0.15 – 0.16/0.15 – 0.16; anterior pronotal width 0.29 – 0.31/0.29 – 0.33; mesal pronotal length 0.26 – 0.29/0.27 – 0.31; basal pronotal width 0.64 – 0.70/0.66 – 0.77; length of embolial margin 0.51 – 0.59/0.57 – 0.68; length of cuneal margin 0.28 – 0.33/0.29 – 0.34; maximum width across hemelytra 0.67 – 0.71/0.69 – 0.86.
Distribution
Northeastern and central Thailand (Nakhon Ratchasima, Saraburi, Nakhon Nayok, Suphan Buri, Ayutthaya, Bangkok); India (Ghauri 1972; Muraleedharan 1977), Pakistan (Ghauri 1972), Iran (Erfan et al. 2010), Sudan (Ghauri 1972). It was recorded from Thailand by Kernasa et al. (2008) under the reports on its biology.
Remarks
Orius maxidentex is most similar to O. tantillus, but can be distinguished from the latter by the semitransparent pale yellow hemelytra with apically darkened cuneus, the slightly lower density of setae and punctures on pronotal callus, and the very narrow anterior area to median furrow in ostiolar peritreme. In addition, the structures of male and female genitalia readily distinguish O. maxidentex from O. tantillus (Figures 13A, B, 18A – F, 20A, B).
Habitat
Mainly found on Gramineae and Cyperaceae species near or in cultivated areas, where it co-occurred with O. tantillus. Sometimes collected on flowers of Mangifera indica (Anacardiaceae), together with O. dravidiensis.
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 1136-1142, DOI: 10.1080/00222933.2015.1104393, http://zenodo.org/record/3990373