Dissomphalus nandus 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 : 44-45

publication ID

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

publication LSID




persistent identifier


treatment provided by


scientific name

Dissomphalus nandus Mugrabi & Azevedo

sp. nov.

Dissomphalus nandus Mugrabi & Azevedo , sp. nov.

( Figs 62–64, 115, 194–95)

Description. MALE. Body length 1.94 mm. LFW 1.44 mm. Maximum wing width 0.61 mm. Color. Head dark castaneous; mesosoma castaneous; metasoma castaneous with light castaneous spots.

Head. Mandible with apical tooth. Clypeus with median lobe subtrapezoidal; 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 10:5:3:4. Frons strongly coriaceous, punctures small. LH 1.14 × WH, WF 0.64 × WH, WF 1.29 × HE, OOL 1.38 × WOT, DAO 0.38 × WOT, posterior ocelli distant from vertex crest 0.33 × DAO, frontal angle of ocellar triangle acute, VOL 0.79 × HE. Vertex crest straight. Occipital carina not visible in dorsal view.

Mesosoma. Pronotal disc strongly coriaceous, anterior margin ecarinate. Notauli shallow, complete, evenly narrow, converging posterad. Propodeal disc 0.84 × as long as wide; basal triangle rugulose, posterolateral area weakly coriaceous; median carina posteriorly incomplete; lateral margins straight, parallel; posterior carina welldefined, medially sinuous. Lateral of propodeum mostly weakly coriaceous. Propodeal declivity mostly imbricate.

Metasoma. Tergal process with very shallow, longitudinal elliptical and lateral pair of depressions; depressions 0.4 × as long as tergite II, diverging posterad, distant each other 5.4 × maximum transverse diameter, with setae very short on lateral area, laterad, without pair of tubercles, with posterad tuft of setae ( Figs 62–64). Hypopygium with median stalk 0.87 × as long as hypopygeal plate; median stalk wide; corner of anterior margin angular; lateral stalk of hypopygium 0.87 × as long as median stalk; posterior margin straight; corner rounded (Fig. 115).

Genitalia ( Figs 194–195). Genital ring strongly produced, each half sinuous in dorsal view. Basiparamere with dorsal surface much wider apicad, much narrower than ventral surface. Paramere with basal area wider than basiparamere apex; apex rounded; apical margin strongly convex in ventral view, not curved. Basivolsella setose, with two thin, short, median and basal setae. Aedeagus 2.86 × as long as wide; dorsal body of aedeagus wider medially, narrowing progressively apicad, lateral margin weakly convex, converging apicad, 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 surpassing half length of dorsal body, not reaching base of apical lobe of dorsal body, lateral margin sinuous, wider medially and base much narrower than apex. Apodeme extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Ubon Ratchathani: Pha Taem NP, Saengjan waterfall, 15°31.985’N 105°35.774’E, 155 m, Malaise trap, 18–25.ix.2006, Mitchai Sai-ngam leg., T894 GoogleMaps . Paratypes: THAILAND. Malaise trap, Chiang Mai: 1 ♂ Doi Inthanon NP, Vachirathan Fall , 18°32.310’N 98°36.048’E, 700 m, 15–22.iv.2007, Y. Areeluck leg., T1842 GoogleMaps . Sakon Nakhon: 1 ♂ Phu Pha Yon NP, Channel , 16°55.639’N 104°10.748’E, 295 m, 23–29.vii.2006, Manop Ngoyjansri & Chatree Cheaukamjan leg., T298 GoogleMaps . Phitsanulok: Thung Salaeng Luang NP, Pongpitak Pranee leg., 1 ♂ Moist evergreen, 16°50.641’N 100°52.894’E, 557 m, 25.viii–1.ix.2006, T572 GoogleMaps ; Mixed deciduous forest, 16°50.563’N 100°51.757’E, 481 m, Pan trap, 13–14.ix.2006, 1 ♂ T921 GoogleMaps ; Malaise trap, 1 ♂ Dry evergreen, 16°50.217’N 100°52.541’E, 580 m, 1–8.ix.2006, T576 GoogleMaps . Phetchabun: Khao Kho NP, Somchai Chachumnan & Saink Singtong leg., 1 ♂ Mix deciduous, 16°39.572’N 101°8.194’E, 171 m, 19–26.i.2007, T1397 GoogleMaps ; Mixed deciduous forest, 16°32.561’N 101°2.479’E, 537 m, 26.xii.2006 – 2.i.2007, 1 ♂ T1187 GoogleMaps . Loei: 1 ♂ Phu Kradueng NP, Forest protection unit Loei.5 ( Phakbung ), 16°50.493’N 101°41.726’E, 412 m, 19–25.ii.2007, Noo Kerdlom leg., T1503 GoogleMaps . Ubon Ratchathani: 1 ♂ Pha Taem NP, Foot of Phu Kra jeaw, 15°39.989’N 105°30.468’E, 238 m, 4–11.xii.2006, Thongcome & Pakdee leg., T1200 GoogleMaps . Chaiyaphum: Pa Hin Ngam NP, 1 ♂ Dry evergreen forest ( Thepana watrfall), 15°38.884’N 101°25.840’E, 605 m, 1–7.x.2006, Katae Sanog & Buakaw Adnafai leg., T658 GoogleMaps ; 1 ♂ ecotone between mix deciduous and dipterocarp forest, 15°38.100’N 101°23.857’E, 700 m, 19–25.ii.2007, T1651 GoogleMaps . Suphanburi: 1 ♂ Pu Toei NP, Huai Mongpae /red road, 14°56.985’N 99°26.780’E, 300 m, 16–23.vii.2008, Saunbua. L. leg., T3117 GoogleMaps . Surat Thani: 1 ♂ Khao Sok NP, Klong Mog Unit , 8°53.725’N 98°39.025’E, 87 m, 31.vii–7.viii.2008, Pongphan leg., T3067 GoogleMaps .

Variations. Body length between 1.59 and 2.77 mm; LFW between 1.37 and 2.13 mm; maximum wing width between 0.61 and 0.91 mm; frontal carina triangular in dorsal view; median carina of clypeus varies between basally incomplete and absent; pronotal declivity low; scutellar groove dilated medially; posterior transverse carina of propodeal disc conspicuous or inconspicuous with median concavity moderate to absent; metasomal tergite I groove long, 0.50 × as long as tergite I; median region of aedeagal dorsal body with large, high and rounded expansion in dorsal view.

Remarks. Dissomphalus nandus sp. nov. is similar to D. turinus sp. nov. because of the following characteristics: vertex crest straight; mandible with one apical tooth; clypeal median tooth 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 slightly wider medially. However, D. nandus sp. nov. differs as follows: hypopygeal posterior margin straight; basiparamere evenly narrow with dorsal surface much narrower than ventral surface; base of paramere much wider than basiparamere apex, apex forming straight angle with inner surface; aedeagal dorsal body lozenge-shaped; aedeagal ventral ramus short, wider medially, lateral margin convex and apex angulate; aedeagal apodeme with apex turned laterad.

Distribution. Thailand (Chiang Mai, Sakon Nakhon, Phitsanulok, Phetchabun, Loei, Ubon Ratchathani, Suphanburi and Surat Thani).