Dissomphalus kelsus 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 : 47-49

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

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Dissomphalus kelsus Mugrabi & Azevedo

sp. nov.

Dissomphalus kelsus Mugrabi & Azevedo , sp. nov.

( Figs 68–70, 117, 200–201)

Description. MALE. Body length 2.24 mm. LFW 1.63 mm. Maximum wing width 0.72 mm. Color. Head and mesosoma black; metasoma dark castaneous.

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 12:4:5:4. Frons weakly coriaceous, punctures small. LH 1.06 × WH, WF 0.63 × WH, WF 1.22 × HE, OOL 1.44 × WOT, DAO 0.44 × WOT, posterior ocelli distant from vertex crest 0.25 × DAO, frontal angle of ocellar triangle right, VOL 0.61 × HE. Vertex crest weakly convex. Occipital carina visible in dorsal view.

Mesosoma. Pronotal disc strongly coriaceous, anterior margin ecarinate. Notauli shallow, complete, evenly narrow, converging posterad. Propodeal disc 0.81 × as long as wide; basal triangle rugulose, posterolateral area polished; median carina posteriorly incomplete; lateral margins straight, parallel; posterior carina well-defined, with median concavity. Lateral of propodeum mostly striate. Propodeal declivity mostly polished.

Metasoma. Tergal process absent ( Figs 68–70). Hypopygium with median stalk 0.72 × as long as hypopygeal plate; median stalk wide, apex bifurcated; corner of anterior margin angular; lateral stalk of hypopygium 0.23 × as long as median stalk; posterior margin straight; corner rounded (Fig. 117).

Genitalia ( Figs 200–201). Genital ring straight, each half straight in dorsal view. Basiparamere with dorsal surface rectangular, much narrower than ventral surface. Paramere with basal area as wide as basiparamere apex; apex subangulate; apical margin weakly concave in ventral view, not curved. Basivolsella glabrous. Cuspis biramous. Aedeagus 1.77 × as long as wide; dorsal body of aedeagus evenly wide, narrowing abruptly 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 as high as dorsal body, lateral margin of ventral ramus sinuous, wider basally and apex much narrower than base. Apodeme not extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Phetchabun: Khao Kho NP, Mixed deciduous forest, 16°32.539’N 101°2.483’E, 524 m, Pan trap, 11–12.xii.2006, Somchai Chachumnan & Saink Singtong leg., T1177 GoogleMaps . Paratypes: THAILAND. Malaise trap, Lampang : 1 ♂ Chae Son NP, Campground #3, 18°49.757’N 99°28.266’E, 487 m, 1–8.x.2007, Bunruen Kwunnui & Acharaporn Sukpeng leg., T2814 GoogleMaps . Loei: Phu Ruea NP , 1 ♂ office, 17°28.826’N 101°21.330’E, 860 m, 19–26.vii.2006, Nukoonchai Jaroenchai leg., T317 GoogleMaps ; 1 ♂ Hua Dong Tham Sun, 17°29.54’N 101°20.995’E 1130 m, 26.xi-2.xii.2006, Patikhom Tumtip leg., T1124 GoogleMaps . Phitsanulok: 1 ♂ Thung Salaeng Luang NP, Mix deciduous forest, 16°50.319’N 100°51.792’E, 479 m, 1–8.ix.2006, Pongpitak Pranee leg., T577 GoogleMaps . Phetchabun: Nam Nao NP, Hell evergreen forest, Noopien Hongyothee leg. , 1 ♂ 16°44.402’N 101°34.560’E, 883 m, 27.xi–4.xii.2006, T1329 GoogleMaps , 1 ♂ 16°44.387’N 101°34.531’E, 838 m, Pan trap, 21–22.xi.2006, T1318 GoogleMaps ; Malaise trap, Khao Kho NP, Savana at nursery, Somchai Chatchumnan and Saink Singtong leg., 1 ♂ 16°52.568’N 101°8.104’E, 520 m, 5–12.x.2006, T804 GoogleMaps ; 1 ♂ Nursery, 16°52.573’N 101°8.077’E, 520 m, 26.x– 2.xi.2006, T812 GoogleMaps ; Mixed deciduous forest at Ta Phol river , 16°32.561’N 101°2.479’E, 242 m GoogleMaps , 1 ♂ 5–12.xi.2006, T968 , 1 ♂ 26.xi–2.xii.2006, T977 ; Mixed deciduous forest, 16°32.561’N 101°2.479’E, 537 m GoogleMaps , 1 ♂ 5–12.xii.2006, T1178 , 6 ♂ 12–19.xii.2006, T1181 , 1 ♂ 26.xii.2006 – 2.i.2007, T1187 ; 16°32.546’N 101°2.501’E, 560 m, 3 ♂ 19– 26.xii.2006, T1186 , 4 ♂ 26.xii.2006 – 2.i.2007, T1189 ; 16°32.539’N 101°2.483’E, 524 m, Pan trap, 12 ♂ 11– 12.xii.2006, T1177 , Malaise trap, 19–26.xii.2006, 1 ♂ T1185 , 2 ♂ 26.xii.2006 – 2.i.2007, T1188 . Nakhon Nayok: 1 ♂ Khao Yai NP, Nature trail in moist evergreen forest, 14°24.482’N 101°22.388’E, 755 m, 12–19.viii.2006, Pong GoogleMaps

Variations. Body length between 1.44 and 2.24 mm; LFW between 1.17 and 1.63 mm; maximum wing width between 0.46 and 0.72 mm; propodeal declivity without median carina.

Remarks. Dissomphalus kelsus sp. nov. is similar to D. jubus sp. nov. because of the following characteristics: mandible with two apical teeth; clypeal apical margin evenly projected with one tooth, clypeal median carina absent; WF 1.22 × HE; anterior ocellus 0.18 × as wide as WF; pronotal declivity low; median region of genital ring with inclination angle about 90º; hypopygium short, its median and lateral stalks thick; basiparamere evenly narrow; paramere with apex sub-angulate, base as narrow as basiparamere; digitus long; aedeagal dorsal body globoid. However, D. kelsus sp. nov. differs as follows: hypopygium rounded, median stalk long and wide with apex bifurcated; inner lobe of aedeagal dorsal body not visible in either dorsal or ventral view; aedeagal dorsal body elliptical, with apical ornaments; ventral ramus sub-triangular, wider basally and narrowing progressively apicad, almost as long as dorsal body.

This species has no tergal process. However there is an arc of few and sparse setae on the surface of metasomal tergite II. This arc is also present in D. turinus sp. nov. and D. lidinus sp. nov., and in these there species this arc can be found in the other segments. Because of that we could not considered such arc as tergal process.

Distribution. Thailand (Lampang, Loei, Phitsanulok, Phetchabun and Nakhon Nayok).