Dissomphalus davus 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 : 39

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

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Dissomphalus davus Mugrabi & Azevedo

sp. nov.

Dissomphalus davus Mugrabi & Azevedo , sp. nov.

( Figs 51–53, 111, 183–185)

Description. MALE. Body length 1.94 mm. LFW 1.75 mm. Maximum wing width 0.72 mm. Color. Head black; mesosoma and metasoma dark castaneous.

Head. Mandible with apical tooth. Clypeus with median lobe tridentate; median tooth angulate or nearly so; median carina complete apically or nearly so, angled in profile. Ratio of first four antennal segments about 4:2:1:1. Frons strongly coriaceous, punctures large. LH 1.06 × WH, WF 0.69 × WH, WF 1.47 × HE, OOL 1.34 × WOT, DAO 0.34 × WOT, posterior ocelli distant from vertex crest 0.67 × 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 0.85 × as long as wide; basal triangle rugulose, posterolateral area polished; median carina posteriorly incomplete; lateral margins straight, converging posterad; posterior carina well-defined, medially concave. Lateral of propodeum mostly weakly coriaceous. Propodeal declivity mostly strongly coriaceous.

Metasoma. Tergal process with shallow, longitudinally elliptical and sublateral pair of depressions; depressions 0.5 × as long as tergite II, diverging posterad, distant each other 2.75 × maximum transverse diameter, without setae; very small pair of tubercles placed on posterior area of depression, conical in longitudinal section, high, entirely laterad, with small pit on top with one seta very short and anterad ( Figs 51–53). Hypopygium with median stalk 1.1 × as long as hypopygeal plate; median stalk wide; corner of anterior margin angular; lateral stalk of hypopygium 0.15 × as long as median stalk; posterior margin weakly concave; corner rounded (Fig. 111).

Genitalia ( Figs 183–185). Genital ring 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; apex rounded; apical margin strongly concave in ventral view, angled mesad. Basivolsella glabrous; with two long spiniform processes, medially articulated, with rounded apex. Aedeagus 2.33 × as long as wide; dorsal body of aedeagus evenly wide, narrowing progressively apicad, lateral margin weakly convex, converging apicad, wholly slightly curved dorsad, apex with one pair of outer lobe; base of dorsal body of aedeagus weakly sclerotized, triangular, with median region truncate; ventral ramus of aedeagus almost as high as dorsal body, lateral margin sinuous, wider medially and base as narrow as apex. Apodeme extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Chiang Mai: Doi Inthanon NP, checkpoint 2, 18°31.559’N 98°29.941’E, 1700 m, Malaise trap, 22.vii–2.viii.2006, Y. Areeluck leg., T121 GoogleMaps . Paratypes: THAILAND. Malaise trap, Chiang Mai: Doi Inthanon NP, checkpoint 2, 18°31.559’N 98°29.941’E, 1700 m, Y. Areeluck leg. GoogleMaps , 1 ♂ 2– 8.vii.2006, T56 , 2 ♂ 22.vii–2.viii.2006, T121 , 1 ♂ 9–16.viii.2006, T180 , 1 ♂ 16–24.viii.2006, T187 . Kamphaeng Phet: 1 ♂ Mae Wong NP, Chong Yen , 16°5.968’N 99°6.472’E, 1306 m, 1–8.x.2007, Chumpol Piluk & Aram Inpuang leg., T2816 GoogleMaps .

Variations. Body length between 1.75 and 2.20 mm; LFW between 1.48 and 1.78 mm; maximum wing width between 0.65 and 0.80 mm; median carina of clypeus slightly convex in lateral view; posterior margin of scutellar groove straight; anterolateral margin of metasomal tergite II with one to five setae; inner lower surface of depression of tergal process with long setae; tubercle directed upward.

Remarks. Dissomphalus davus sp. nov. is similar to D. gionus sp. nov., D. hetus sp. nov. and D. paulus sp. nov. because of the following characteristics: aedeagal dorsal body rectangular, its ventral surface with long and very thick seta; paramere almost as long as basiparamere. However, D. davus sp. nov. has the following differences: genital ring straight, median region with inclination angle between 45 and 90º; paramere with rounded apex in dorsal view, apical constriction forming right angle with inner surface of paramere; median region of basivolsella with two articulated and long projections, its apex rounded; aedeagal dorsal body with slightly converging apicad, its inner lobe widely exposed in dorsal view; aedeagal ventral ramus almost as high as dorsal body, narrower apically.

Distribution. Thailand (Chiang Mai and Kamphaeng Phet).