Dissomphalus prilus Mugrabi & Azevedo

MUGRABI, DANIELE F. & AZEVEDO, CELSO O., 2013, Revision of Thai Dissomphalus Ashmead, 1893 (Hymenoptera, Bethylidae), with description of twenty four new species, Zootaxa 3662 (1), pp. 1-73 : 29-30

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https://doi.org/ 10.11646/zootaxa.3662.1.1

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Dissomphalus prilus Mugrabi & Azevedo

sp. nov.

Dissomphalus prilus Mugrabi & Azevedo , sp. nov.

( Figs 31–33, 105, 162–164)

Description. MALE. Body length 4.03 mm. LFW 2.7 mm. Maximum wing width 1.06 mm. Color. Head and mesosoma black; metasoma dark castaneous.

Head. Mandible with five apical teeth. Clypeus with median lobe subtrapezoidal; median tooth angulate or nearly so; median carina complete apically or nearly so, straight in profile or nearly so. Ratio of first four antennal segments about 16:7:6:6. Frons strongly coriaceous, punctures large. LH 0.97 × WH, WF 0.65 × WH, WF 1.75 × HE, OOL 1.3 × WOT, DAO 0.41 × WOT, posterior ocelli distant from vertex crest 1 × DAO, frontal angle of ocellar triangle right, VOL 0.96 × HE. Vertex crest weakly convex. Occipital carina not visible in dorsal view.

Mesosoma. Pronotal disc strongly coriaceous, anterior margin ecarinate. Notauli deep, complete, widening posterad, converging posterad. Propodeal disc 0.55 × as long as wide; basal triangle rugulose, posterolateral area rugulose; median carina complete; lateral margins weakly convex, parallel; posterior carina well-defined, convex. Lateral of propodeum mostly striolate. Propodeal declivity mostly strigate.

Metasoma. Tergal process with deep, subtriangular and sublateral pair of depressions, depressions with external lateral margin higher than internal lateral margin, 0.92 × as long as tergite II, diverging posterad, distant each other 2.55 × maximum transverse diameter, with setae short and mesad on lateral area; small pair of tubercles placed on center of depression, evenly wide in longitudinal section, low, entirely laterad, with small pit on top with short and dorsad tuft of setae ( Figs 31–33). Hypopygium with median stalk 1.5 × as long as hypopygeal plate; median stalk narrow; corner of anterior margin angular; lateral stalk of hypopygium 0.1 × as long as median stalk; posterior margin sinuous; corner rounded ( Fig. 105).

Genitalia ( Figs 162–164). Genital ring strongly produced, each half convex in dorsal view. Basiparamere with dorsal surface much wider apicad, much narrower than ventral surface. Paramere with basal area as wide as basiparamere apex; apex subangulate; apical margin view weakly concave in ventral, not curved; inner margin of ventral surface with triangular spine at apical region. Basivolsella glabrous. Cuspis biramous. Aedeagus 6 × as long as wide; dorsal body of aedeagus wider basally, narrowing abruptly apicad, lateral margin strongly convex basally, converging apicad, not curved dorsad, apex with two pair of outer lobes; dorsal pair 3.18 × as long as wide, straight, with apex rounded and dorsad, outer lateral with laminar process, elliptical, with lateral surface wider than dorsal and ventral surfaces; ventral pair tubular, long, straight, dorsad, with apical margin subangulate and surface smooth, as long as dorsal lobe of aedeagus; base of dorsal body of aedeagus strongly sclerotized, strongly concave, with median region bidentate; ventral ramus of aedeagus almost as high as dorsal body, lateral margin straight, evenly narrow and base as narrow as apex. Apodeme extending beyond genital ring.

99°9.355’E, 569 m, Malaise trap, 25.vii-1.viii.2007, Wongchai.P. leg., T2951 . Paratypes : THAILAND. Malaise trap, Chiang Mai: Doi Phahompok NP, Headquarter , 19°57.961’N 99°9.355’E, 569 m, 2 ♂ 11-18.vii.2007, Wongchai.P. leg., T2945 GoogleMaps ; 1 ♂ 18-25.vii.2007, Seesom.K. leg., T2947 GoogleMaps ; 1 ♂ Doi Chiang Dao WS, Nature Trail, 19°24.187’N 98°55.312’E, 491 m, 31.vii-7.viii.2007, Songkrant Jagsu & Apichat Watwanich leg., T2829 GoogleMaps . Chanthaburi: Khao Khitchakut NP, Prabaht Unit, Charoenchai & Suthida leg., 1 ♂, 50 m NE , 12°48.779’N 102°9.181’E, 107 m, 14-21.vii.2008, T2974 GoogleMaps , 1 ♂ Campground, 12°48.852’N 102°9.204’E 99 m, 1-7.vii.2008, T2983 GoogleMaps . Kanchanaburi: Khuean Srinagarindra NP, 1 ♂ Tham Nanya , 14°41.604’N 98°52.722’E, 750 m, 28.viii- 4.ix.2008, Somboon & Daorueng leg., T3426 GoogleMaps ; 1 ♂ Tha Thung-na/Chong Kraborg, 14°29.972’N 98°53.035’E, 210 m, 5-12.ii.2009, Boonnam & Phumarin leg., T4766 GoogleMaps . Surat Thani: 1 ♂ Khao Sok NP, Bang Huaraed , 8°54.555’N 98°30.522’E, 122 m, 30.xii.2008 - 6.i.2009, Pongphan leg., T3895 GoogleMaps .

Variations. Body length between 4.03 and 4.10 mm; LFW between 2.70 and 2.92 mm; maximum wing width between 1.06 and 1.25 mm; palpi castaneous or dark castaneous, antennae light castaneous, darkening gradually apicad, first third of anal vein castaneous, basal-distal corner of discoid vein castaneous; head vertex varies between straight and slightly convex; notaulus almost complete; propodeal disc weakly to strongly striate; spine of inner margin of ventral surface of paramere angulate to rounded.

Remarks. Dissomphalus prilus sp. nov. is similar to D. epitus sp. nov. because of the following characteristics: lateral surface of tergite II higher than its median region; depression of tergal process touching posterior margins of tergites I and II; posterior margin of hypopygium with three invaginations; inner margin of ventral surface of paramere with triangular spine; ventral pair of apical lobes of aedeagal dorsal body turned dorsad, as long as dorsal lobe; and aedeagal ventral ramus almost as long as dorsal body. However, D. prilus sp. nov. differs from D. epitus sp. nov. as follows: angle of median region of genital ring less than 45º; aedeagal dorsal body 6.00 × as long as wide; laminar outer dorsal lobe of aedeagal dorsal body 3.18 × as long as wide and rounded with straight apex with outer lateral with laminar process; and ventral outer lobe of aedeagal dorsal body tubular, straight, with surface smooth.

Distribution. Thailand (Chiang Mai, Chanthaburi, Kanchanaburi and Surat Thani).