Dissomphalus turinus 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 : 49-50

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

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Dissomphalus turinus Mugrabi & Azevedo

sp. nov.

Dissomphalus turinus Mugrabi & Azevedo , sp. nov.

( Figs 71–72, 118, 202–203)

Description. MALE. Body length 1.86 mm. LFW 1.52 mm. Maximum wing width 0.68 mm. Color. Head dark castaneous; mesosoma and metasoma castaneous.

Head. Mandible with apical tooth. Clypeus with median lobe tridentate; 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 11:5:4:3. Frons weakly coriaceous, punctures small. LH 1.07 × WH, WF 0.68 × WH, WF 1.58 × HE, OOL 1.37 × WOT, DAO 0.37 × WOT, posterior ocelli distant from vertex crest 0.67 × DAO, frontal angle of ocellar triangle right, VOL 1.08 × HE. Vertex crest straight. Occipital carina visible in dorsal view.

Mesosoma. Pronotal disc weakly coriaceous, anterior margin ecarinate. Notauli shallow, incomplete, almost reaching posterior margin of mesoscutum, evenly narrow, converging posterad. Propodeal disc 0.82 × as long as wide; basal triangle rugulose, posterolateral area polished; median carina posteriorly incomplete; lateral margins straight, parallel; posterior carina weakly marked medially, with median concavity. Lateral of propodeum mostly weakly coriaceous. Propodeal declivity mostly polished.

Metasoma. Tergal process absent ( Figs 71–72). Hypopygium with median stalk 1 × as long as hypopygeal plate; median stalk wide; corner of anterior margin angular; lateral stalk of hypopygium 0.23 × as long as median stalk; posterior margin weakly concave; corner rounded (Fig. 118).

Genitalia ( Figs 202–203). Genital ring produced, each half straight in dorsal view. Basiparamere with dorsal surface wider apicad, slightly narrower than ventral surface. Paramere with basal area as wide as basiparamere apex; apex rounded; apical margin obliquely straight in ventral view, angled mesad. Basivolsella glabrous; with two long spiniform processes, medially articulated, with rounded apex. Aedeagus 3.3 × as long as wide; dorsal body of aedeagus wider medially, narrowing progressively apicad, lateral margin straight, 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 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. 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 Phahompok NP, Kiewlom 1: Montane Forest , 20°3.455’N 99°8.551’E, 2174 m, 7– 14.ix.2007, Komwuan Srisom & Prasit Wongchai leg. GoogleMaps , 16 ♂ T2810 , 1 ♂ T2815 ; 4 ♂ Kiewlom 2: Montane Forest , 20°3.331’N 99°8.552’E, 2112 m, 7–14.ix.2007, T2833 GoogleMaps ; Doi Inthanon NP, checkpoint 2 18°31.559’N 98°29.941’E, Nam Pong NP, office, 3 ♂ 16°37.377’N 102°34.454’E, 344 m, 5–12.vii.2006, Khamphol Jaidee leg., T106 GoogleMaps ; 1 ♂ 16°37.201’N 102°34.481’E, 218 m, 19–26.vii.2006, T113 GoogleMaps .

Variations. Body length between 1.41 and 2.35 mm; LFW between 1.33 and 1.90 mm; maximum wing width between 0.53 and 0.84 mm; notaulus not reaching posterior margin of mesoscutum; posterior transverse carina of propodeal disc medially concave.

Remarks. D. turinus sp. nov. is similar to D. nandus sp. nov. because of the following characteristics: vertex crest straight; mandible with one apical tooth; clypeal median lobe directed ventrad; eye sub-circular and gibbous; OOL 1.38 × WOT; DAO 0.38 × WOT; notaulus evenly narrow; wing with metacarpus 1.50 × as long as stigma; propodeal declivity forming obtuse angle with propodeal disc; hypopygium with median stalk wide, lateral margins slightly convergent posterad; aedeagal dorsal body wider medially. However, D. turinus sp. nov. differs as follows: hypopygeal posterior margin slightly concave; basiparamere evenly wide with dorsal surface as wide as ventral one; base of paramere as wide as basiparamere apex, apex forming right angle with inner surface; aedeagal dorsal body triangular; ventral ramus long, apex rounded, abruptly wider medially, outer lateral margin sinuous; aedeagal apodeme with apex turned ventrad.

This species is similar to D. kelsus sp. nov. by having metasomal tergite II with arc of few and sparse setae. However in the fomer the setae are longer than in the latter.

Distribution. Thailand (Chiang Mai and Khonkaen).