Dissomphalus epitus 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 : 24-26

publication ID

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

publication LSID




persistent identifier


treatment provided by


scientific name

Dissomphalus epitus Mugrabi & Azevedo

sp. nov.

Dissomphalus epitus Mugrabi & Azevedo , sp. nov.

( Figs 24–26, 103, 155–158)

Description. MALE. Body length 4.25 mm. LFW 3.04 mm. Maximum wing width 1.37 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, angled in profile. Ratio of first four antennal segments about 18:7:7:8. Frons strongly coriaceous, punctures large. LH 0.91 × WH, WF 0.65 × WH, WF 1.46 × HE, OOL 1.3 × WOT, DAO 0.35 × WOT, posterior ocelli distant from vertex crest 1.57 × DAO, frontal angle of ocellar triangle right, VOL 0.66 × HE. Vertex crest straight. Occipital carina not visible in dorsal view.

Mesosoma. Pronotal disc strongly coriaceous, anterior margin ecarinate. Notauli deep, incomplete, almost reaching posterior margin of mesoscutum, widening posterad, parallel. Propodeal disc 0.56 × as long as wide; basal triangle rugulose, posterolateral area rugulose; median carina complete; lateral margins strongly 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, 0.84 × as long as tergite II, diverging posterad, distant each other 1.72 × maximum transverse diameter, with setae short and posterad on both lateral areas; small pair of tubercles placed on center of depression, evenly wide in longitudinal section, high, entirely dorsad, with broad pit on top with short and dorsad tuft of setae ( Figs 24–26). Hypopygium with median stalk 1.37 × as long as hypopygeal plate; median stalk narrow; corner of anterior margin angular; lateral stalk of hypopygium 0.09 × as long as median stalk; posterior margin sinuous; corner rounded ( Fig. 103).

Genitalia ( Figs 155–158). Genital ring 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 obliquely straight in ventral view, not curved; inner margin of ventral surface with triangular spine at median region. Basivolsella glabrous. Cuspis biramous. Aedeagus 4 × as long as wide; dorsal body of aedeagus wider basally, narrowing abruptly apicad, lateral margin strongly convex basally, parallel, not curved dorsad, apex with two pair of outer lobes; dorsal pair 1.5 × as long as wide, strongly arched, with apex angulate and ventrad, sharpened with lateral margin concave, with dorsal and ventral surfaces wider than lateral surface; ventral pair flattened, long, strongly arched, dorsad, with apical margin angulate and surface pectinate, 1 × as long as dorsal lobe of aedeagus; base of dorsal body of aedeagus weakly sclerotized, weakly concave, with median region rectangular; 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.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Chiang Mai: Doi Phahompok NP, Headquarter , 19°57.961’N 99°9.355’E, 569 m, Malaise trap, 11-18.vii.2007, Wongchai.P. leg., T2945 GoogleMaps . Paratypes: THAILAND. Malaise trap, Chiang Mai: Doi Phahompok NP, Headquarter , 19°57.961’N 99°9.355’E, 569 m GoogleMaps , 1 ♂ 11-18.vii.2007, Wongchai.P. leg., T2945 ; 2 ♂ 18-25.vii.2007, Seesom.K. leg., T2947 ; 1 ♂ 25.vii-1.viii.2007, Wongchai.P. leg., T2951 ; 1 ♂ campground pond, 18°32.657’N 98°31.482’E, 1200 m, 8-15.vii.2006, Y. Areeluck leg., T63 GoogleMaps . Loei: 1 ♂ Phu Ruea NP, Behind checkpoint, 17°27.829’N 101°21.360’E, 691 m, 5-8.vi.2007, Patikhom Tumtip leg., T2514 GoogleMaps . Phitsanulok: Thung Salaeng Luang NP, Moist evergreen, 16°50.641’N 100°52.894’E, 557 m, Pongpitak Pranee leg. GoogleMaps , 1 ♂ 11-18.viii.2006, T566 ; 1 ♂ 25.viii-1.ix.2006, T572 ; 1 ♂ Mix deciduous forest, 16°50.319’N 100°51.792’E, 479 m, 11-18.viii.2006, T568 GoogleMaps . Kanchanaburi: 1 ♂, Khuean Srinagarindra NP, Chong Kraborg , 14°29.972’N 98°53.035’E 210 m, 15-22.viii.2008, Wasanchai leg., T3428 GoogleMaps . Nakhon Ratchasima: Khao Yai NP, Cobra zone near fire protection office, 14°28.524’N 101°22.928’E, 757 m, Pong Sandao leg. GoogleMaps , 2 ♂ 5-12.vi.2007, T2221 , 1 ♂ 26.vi-2.vii.2007, T2230 . Nakhon Nayok: Khao Yai NP , 1 ♂ entrance of Nong Pak Chee Trail , 14°27.115’N 101°21.951’E, 733 m, 5-12.v.2007, Wirat Sukho leg., T2264 GoogleMaps ; 1 ♂, Khao Keow spirit house, 14°22.960’N 101°23.253’E, 750 m, 5-12.ix.2006, Pong Sandao leg., T909 GoogleMaps . Chanthaburi: Khao Khitchakut NP, Campground / Prabaht Unit , 12°48.852’N 102°9.204’E, 99 m, Suthida & Charoenchai leg. GoogleMaps , 1 ♂, 21-28.vii.2008, T2988 , 1 ♂ 28.vii-3.viii.2008, T2985 ; 1 ♂ 50 m, NE/ Prabaht Unit , 12°48.779’N 102°9.181’E 107 m, 1-7.vii.2008, Suthida & Charoenchai leg., T2977 GoogleMaps .

Variations. Body length between 2.90 and 5.15 mm; LFW between 2.35 and 3.46 mm; maximum wing width between 1.10 and 1.41 mm; mandible dark castaneous, metasoma castaneous; head 0.91 to 0.98 × as wide as it is long; frontal carina absent; frontal groove drop-shaped, short and shallow; clypeus with median carina 0.21 to 1.15 × as long as clypeal median lobe.

Remarks. Dissomphalus epitus sp. nov. is similar to D. prilus sp. nov. because of the following characteristics: tergite II with lateral surface higher than median region of tergite; depression of tergal process contacts 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 outer lobe of aedeagal dorsal body turned dorsad, as long as dorsal outer lobe; aedeagal ventral ramus almost as high as dorsal body. However, D. epitus sp. nov. is different in the following ways: median region of genital ring with inclination angle of about 45º; aedeagal dorsal body 4.00 × as long as wide; dorsal outer lobe of aedeagal dorsal body tubular, 1.50 × longer than wide, angulate, apex strongly curved, lateral outer lobe without laminar process; flattened, ventral outer lobe of dorsal body strongly curved, surface pectinate.

Distribution. Thailand (Chiang Mai, Loei, Phitsanulok, Kanchanaburi, Nakhon Ratchasima, Nakhon Nayok and Chanthaburi).