Dissomphalus joelus 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 : 43-44

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

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Dissomphalus joelus Mugrabi & Azevedo

sp. nov.

Dissomphalus joelus Mugrabi & Azevedo , sp. nov.

( Figs 60–61, 114, 192–193)

Description. MALE. Body length 2 mm. LFW 1.52 mm. Maximum wing width 0.65 mm. Color. Head dark castaneous; mesosoma and metasoma castaneous.

Head. Mandible with apical tooth. Clypeus with median lobe subtrapezoidal; median tooth angulate or nearly so; median carina complete apically or nearly so, convex in profile. Ratio of first four antennal segments about 12:4:3:3. Frons strongly coriaceous, punctures large. LH 1.37 × WH, WF 0.63 × WH, WF 1.37 × HE, OOL 1.3 × WOT, DAO 0.4 × WOT, posterior ocelli distant from vertex crest 0.5 × DAO, frontal angle of ocellar triangle right, VOL 0.87 × HE. Vertex crest straight. Occipital carina not visible in dorsal view.

Mesosoma. Pronotal disc strongly coriaceous, anterior margin ecarinate. Notauli deep, complete, evenly narrow, converging posterad. Propodeal disc 0.57 × as long as wide; basal triangle rugulose, posterolateral area foveolate; median carina posteriorly incomplete; lateral margins strongly convex, parallel; posterior carina welldefined, with median angulation. Lateral of propodeum mostly strongly coriaceous. Propodeal declivity mostly imbricate.

Metasoma. Tergal process with deep, longitudinally elliptical and sublateral pair of depressions; depressions 0.77 × as long as tergite II, diverging posterad, distant each other 1.6 × maximum transverse diameter, without setae, pair of tubercles and tuft of setae ( Figs 60–61). Hypopygium with median stalk 1.25 × as long as hypopygeal plate; median stalk wide; corner of anterior margin angular; lateral stalk of hypopygium 0.2 × as long as median stalk; posterior margin weakly concave; corner rounded (Fig. 114).

Genitalia ( Figs 192–193). 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 as wide as basiparamere apex, ventral margin deeply excavated forming a mesad projection with apex angulate in lateral view and rounded in dorsal view; apical margin weakly concave in ventral view, angled mesad. Basivolsella glabrous; with six long spiniform processes, medially articulated, with rounded apex. Aedeagus 3.33 × as long as wide; dorsal body of aedeagus narrower apically, narrowing progressively apicad, lateral margin strongly convex basally, parallel, not 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 of ventral ramus sinuous, much wider medially and base as narrow as apex. Apodeme not extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Ubon Ratchathani: Pha Taem NP, Don Huay Can , 15°40.016’N 105°30.502’E, 246 m, Malaise trap 11–18.xii.2006, Thongcome & Pakdee leg., T1202 GoogleMaps . Paratypes: THAILAND. Malaise trap, Chiang Mai: Doi Phahompok NP , 1 ♂ Kiewlom 1: Montane Forest , 20°3.455’N 99°8.551’E, 2174 m, 7–14.ix.2007, Komwuan Srisom & Prasit Wongchai leg., T2810 GoogleMaps , 1 ♂ Sakon Nakhonhu Phan 16°39.479’N 101°8.105’E, 260 m, 5–12.ii.2007, T1600 GoogleMaps ; 1 ♂ Mixed deciduous forest, 16°32.561’N 101°2.479’E, 537 m, 26.xii.2006 – 2.i.2007, T1187 GoogleMaps . Ubon Ratchathani: Pha Taem NP , 1 ♂ Foot of Phu Kra jeaw, 15°39.989’N 105°30.468’E, 238 m, 4–11.xii.2006, Thongcome & Pakdee leg., T1200 GoogleMaps ; 1 ♂ East of Thung Luang in Dipterocarpus forest , 15°39.989’N 105°30.468’E, 238 m, 1–7.i.2007, T1475 GoogleMaps . Chaiyaphum: 1 ♂ Pa Hin Ngam NP, Mixed deciduous forest ( Thepana waterfall), 15°38.920’N 101°25.077’E, 614 m, 1–7.x.2006, Katae Sa-nog & Buakaw Adnafai leg., T656 GoogleMaps . Chanthaburi: Khao Khitchakut NP, Suthida & Charoenchai leg., 1 ♂ Campground / Prabaht Unit , 12°48.852’N 102°9.204’E, 99 m, 4–11.viii.2008, T2987 GoogleMaps ; 1 ♂ 100 m N/ Prabaht Unit , 12°48.842’N 102°9.144’E, 203 m, 11–18.viii.2008, T2967 GoogleMaps ; 1 ♂ Khao Prabaht peak/ 150 m, S of forest base, 12°50.45’N 102°9.81’E 875 m, 27.ii-6.iii.2009, T4046 GoogleMaps . Nakhon Nayok: 1 ♂ Khao Yai NP, entrance of Hnong Pak Chee Trail , 14°27.115’N 101°21.951’E, 733 m, 12–19.v.2007, Pong Sandao leg., T2267 GoogleMaps .

Variations. Body length between 2.73 and 2.85 mm; LFW between 2.16 and 2.28 mm; maximum wing width between 0.95 and 1.14 mm; punctures of frons small and shallow; median carina of clypeus complete; lateral and upper margins of depression of tergal process with long and thick seta; propodeal declivity with gibbous face.

Remarks. D. joelus sp. nov. is similar to D. cherrus sp. nov. because of the following characteristics: genital ring straight, median portion about 90º of inclination; basiparamere irregularly wide, with 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 narrower apically; aedeagal ventral ramus as high as dorsal body; apodeme not extending beyond genital ring. However, D. joelus sp. nov. differs as follows: paramere with lateral margin straight; basivolsella with two projections, basal projection not articulated and with v-shaped apex, apical projection articulated apically with rounded margin; aedeagal dorsal body 3.33 × as long as wide; ventral ramus long, narrower basally, lateral margin sinuous.

Distribution. Thailand (Chiang Mai, Phetchabun, Ubon Ratchathani, Chaiyaphum, Chanthaburi and Nakhon Nayok).