Dissomphalus mugrus 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 : 57-58

Dissomphalus mugrus Mugrabi & Azevedo , sp. nov.

( Figs 89–91 , 126 , 218–220 )

Description. MALE. Body length 2.85 mm. LFW 2.28 mm. Maximum wing width 1.03 mm. Color. Head and mesosoma black; metasoma dark castaneous with castaneous spots.

Head. Mandible with two apical teeth. Clypeus with median lobe ill-defined; with one tooth, median tooth rounded; median carina absent. Ratio of first four antennal segments about 17:6:5:5. Frons strongly coriaceous, punctures large. LH 1.02 × WH, WF 0.58 × WH, WF 1.18 × HE, OOL 1.1 × WOT, DAO 0.64 × WOT, posterior ocelli distant from vertex crest 0.71 × DAO, frontal angle of ocellar triangle acute, VOL 0.46 × HE. Vertex crest straight. Occipital carina visible in dorsal view.

Mesosoma. Pronotal disc weakly coriaceous, anterior margin carinate. Notauli deep, complete, evenly narrow, converging posterad. Propodeal disc 0.51 × as long as wide; basal triangle rugulose, posterolateral area scrobiculate; median carina posteriorly incomplete; lateral margins strongly convex, converging posterad; posterior carina well-defined, convex. Lateral of propodeum mostly strigulate. Propodeal declivity mostly rugulose.

Metasoma. Tergal process with shallow, subcircular and sublateral pair of depressions; depressions 0.73 × as long as tergite II, parallel, distant each other 5.2 × maximum transverse diameter, with setae long and laterad on lateral area, without pair of tubercles, with anterad tuft of setae ( Figs 89–91 ). Hypopygium with median stalk 2 × as long as hypopygeal plate; median stalk narrow, apex bifurcated; corner of anterior margin angular; lateral stalk of hypopygium 0.13 × as long as median stalk; posterior margin sinuous; corner rounded ( Fig. 126 ).

Genitalia ( Figs 218–220 ). Genital ring straight, each half straight in dorsal view. Basiparamere with dorsal surface wider apicad, as narrow as ventral surface. Paramere with basal area as wide as basiparamere apex; apex angulate; apical margin weakly concave in ventral view, not curved. Basivolsella glabrous. Aedeagus 1.68 × as long as wide; dorsal body of aedeagus evenly wide, narrowing progressively apicad, lateral margin straight, parallel, not curved dorsad, apex with one pair of outer lobe; base of dorsal body of aedeagus weakly sclerotized, triangular, with median region angulate; ventral ramus of aedeagus almost as high as dorsal body, lateral margin of ventral ramus sinuous, wider basally and apex much narrower than base. Apodeme extending beyond genital ring.

FEMALE unknown. T2806 . Paratypes : THAILAND. Malaise trap, Chiang Mai: 2 ♂ Doi Chiang Dao WS Nature Trail, 19°24.187’N 98°55.312’E, 491 m, 28.viii–4.ix.2007, Songkrant Jagsu & Apichat Watwanich leg., T2831 .

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; depression of tergal process shallow, almost imperceptible.

Remarks. Dissomphalus mugrus sp. nov. is similar to D. kelsus sp. nov. because of the following characteristics: hypopygium with apex of median stalk bifurcated, lateral margins slightly convergent posterad; genital ring concave, median region with inclination angle about 90º; apex of paramere forming straight angle with inner surface of paramere, apical margin slightly concave; aedeagal dorsal body evenly wide, lateral margins straight; aedeagal ventral ramus wider basally. However, D. mugrus sp. nov. differs from D. kelsus sp. nov. as follows: hypopygium trapezoidal, posterior margin with median invagination; apex of paramere angulate; basiparamere irregularly wide, dorsal surface almost as large as ventral surface; aedeagal dorsal body narrowing progressively apicad, inner lobe widely exposed in dorsal view; apodeme extending beyond genital ring.

Distribution. Thailand (Chiang Mai).

Figures

FIGURES 84–94. Metasoma, 84–85 Dissomphalus magnetus sp. nov., 84, tergal process of metasoma in dorsal view; 85, tubercle of tergal process in dorsal view; 86–88 D. lidinus sp. nov., 86–87, metasoma in dorsal view; 88, setae of second tergite of metasoma; 89–91 D. mugrus sp. nov., 89, metasoma in dorsal view; 90, tergal process of metasoma in dorsal view; 91, tuft of setae of tergal process in dorsal view; 92–94, D. ferrerus sp. nov., 92, metasoma in dorsal view; 93, tergal process of metasoma in dorsal view; 94, tubercle of tergal process in dorsal view.

FIGURES 119–127. Hypopygium in dorsal view, 119, Dissomphalus paulus sp. nov.; 120, D. barbus sp. nov.; 121, D. robus sp. nov.; 122, D. geanus sp. nov.; 123, D. magnetus sp. nov.; 124–125, D. lidinus sp. nov., 124, hypopygium in dorsal view; 125, posterior margin folded dorsad; 126, D. mugrus sp. nov.; 127, D. ferrerus sp. nov. (Scale bars = 50µm, except 126 =

FIGURES 218–222. Male genitalia, 218–220, Dissomphalus mugus sp. nov., 218, dorsal view; 219, apex of aedeagus in ventral view; 220, ventral view; 221–222, D. ferrerus sp. nov., 221, dorsal view; 222, ventral view. (Scale bars = 50µm).