Dissomphalus cherrus 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 : 35-36

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

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Dissomphalus cherrus Mugrabi & Azevedo

sp. nov.

Dissomphalus cherrus Mugrabi & Azevedo , sp. nov.

( Figs 45–47, 109, 175–178)

Description. MALE. Body length 1.67 mm. LFW 1.3 mm. Maximum wing width 0.57 mm. Color. Head black; mesosoma dark castaneous; metasoma dark castaneous with castaneous spots.

Head. Mandible with two apical teeth. Clypeus with median lobe trapezoidal; 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 10:4:3:3. Frons weakly coriaceous, punctures small. LH 0.79 × WH, WF 0.47 × WH, WF 1.3 × HE, OOL 1.22 × WOT, DAO 0.44 × WOT, posterior ocelli distant from vertex crest 0.5 × DAO, frontal angle of ocellar triangle acute, VOL 0.71 × HE. Vertex crest weakly convex. Occipital carina not visible in dorsal view.

Mesosoma. Pronotal disc strongly coriaceous, anterior margin ecarinate. Notauli deep, complete, evenly narrow, converging posterad. Propodeal disc 0.76 × as long as wide; basal triangle polished, posterolateral area foveolate; median carina posteriorly incomplete; lateral margins straight, converging posterad; posterior carina weakly marked medially, with median angulation. Lateral of propodeum mostly weakly coriaceous. Propodeal declivity mostly imbricate.

Metasoma. Tergal process with shallow, longitudinally elliptical and lateral pair of depressions; depressions 0.5 × as long as tergite II, diverging posterad, distant each other 2 × maximum transverse diameter, with setae long and centrad on all margins; small pair of tubercles placed on anterior area of depression, evenly wide in longitudinal section, high, entirely dorsad, with small pit on top with few setae very short and dorsad ( Figs 45–47). Hypopygium with median stalk 1.29 × as long as hypopygeal plate; median stalk wide; corner of anterior margin rounded; lateral stalk of hypopygium 0.1 × as long as median stalk; posterior margin weakly concave; corner rounded (Fig. 109).

Genitalia ( Figs 175–178). Genital ring slightly produced, each half straight in dorsal view. Basiparamere with dorsal surface much wider apicad, slightly narrower than ventral surface. Paramere with basal area wider than basiparamere apex, ventral margin deeply excavated forming a mesad projection with apex angulate in lateral view and rounded in dorsal view; apical margin weakly convex in ventral view, angled mesad. Basivolsella glabrous; with three long spiniform processes, not articulated, with rounded apex. Aedeagus 2.14 × as long as wide; dorsal body wider medially of aedeagus, narrowing progressively apicad, lateral margin strongly convex medially,

parallel, wholly slightly curved dorsad, apex with one pair of outer lobe; base of dorsal body of aedeagus strongly sclerotized, triangular, with median region truncate; ventral ramus of aedeagus as high as dorsal body, lateral margin sinuous, much wider medially and base as narrow as apex. Apodeme not extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Chaiyaphum: Tat Tone NP, Lawn near Sab Somboon forest unit, 16°0.792’N 101°58.472’E, 648 m, Malaise trap, 5–12.xi.2006, Tawit Jaruphan leg., T1136 GoogleMaps . Paratypes: THAILAND. Malaise trap, Lampang: 1 ♂ Chae Son NP, Nursery , 18°49.851’N 99°28.122’E, 485 m, 1–7.xi.2007, Bunruen Kwunnui & Acharaporn Sukpeng leg., T2818 GoogleMaps . Phitsanulok: 1 ♂ Thung Salaeng Luang NP, Moist evergreen, 16°50.641’N 100°52.894’E, 557 m, 11–18.viii.2006, Pongpitak Pranee leg., T566 GoogleMaps . Phetchabun: Khao Kho NP, office, 16°39.550’N 101°8.134’E, 230 m, 19–26.vii.2006, Somchai Chatchumnan & Sa-ink Singtong leg., 1 ♂ T171 GoogleMaps , 2 ♂ T170 GoogleMaps . Nakhon Nayok: 2 ♂ Khao Yai NP, evergreen forest near Hnong Pakchee , 14°27.119’N 101°21.482’E, 699 m, 19–26.v.2007, Wirat Sukho leg., T2271 GoogleMaps . Surat Thani: 1 ♂, Khao Sok NP Bang Huaraed , 8°54.555’N 98°30.522’E, 122 m, 13-20.i.2009, Pongphan leg., T3914 GoogleMaps . Nakhon Si Thammarat: 3 ♂ Namtok Yong NP, Behind campground lavatory, 8°10.434’N 99°44.508’E, 80 m, 12–19.viii.2008, U.prai.K. leg., T3080 GoogleMaps .

Variations. Body length between 1.48 and 2.39 mm; LFW between 1.14 and 1.52 mm; maximum wing width between 0.42 and 0.57 mm; frontal carina of head drop-shaped; vertex crest straight; lower mandibular tooth angulate; median carina of clypeus high, complete, straight in lateral view; clypeal median tooth angulate; antenna with erect pubescence; eye with evenly sparse seta; depression of tergal process touching posterior margin of tergite I, 0.50 to 0.70 × as long as tergite II; tubercle funnel-shaped; anterior margin of pronotal disc rugose; posterior carina of propodeal disc well-defined.

Remarks. D. cherrus sp. nov. is similar to D. joelus sp. nov. because of the following characteristics: genital ring straight, median region with inclination about 90º; basiparamere irregularly wide, dorsal surface shorter than ventral surface; ventral surface of paramere divided with apical constriction, apex forming right angle with inner surface of paramere; basivolsella with long projections; aedeagal dorsal body narrow apically; aedeagal ventral ramus as high as dorsal body; apodeme not extending beyond genital ring. However, D. cherrus sp. nov. differs from D. joelus sp. nov. as follows: paramere with sinuous dorsal margin; apex of aedeagal dorsal body wide; basivolsella with three projections with rounded apex; aedeagal dorsal body 2.14 × as long as wide, wider medially and strongly convex medially; pair of outer apical lobes of dorsal body with wide exposure of the inner lobe in dorsal view; aedeagal ventral ramus with median region very wide; aedeagal apodeme concave.

Distribution. Thailand (Chaiyaphum, Lampang, Phitsanulok, Phetchabun, Nakhon Nayok, Surat Thani and Nakhon Si Thammarat).