Dissomphalus barbus 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 : 51-52

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

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Dissomphalus barbus Mugrabi & Azevedo

sp. nov.

Dissomphalus barbus Mugrabi & Azevedo , sp. nov.

( Figs 76–78, 120, 207–209)

Description. MALE. Body length 2.7 mm. LFW 1.98 mm. Maximum wing width 0.91 mm. Color. Head and mesosoma black; metasoma dark castaneous with castaneous spots.

Head. Mandible with three apical teeth. 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 5:3:3:3. Frons strongly coriaceous, punctures large. LH 1.02 × WH, WF 0.65 × WH, WF 1.39 × HE, OOL 2 × WOT, DAO 0.63 × WOT, posterior ocelli distant from vertex crest 1 × DAO, frontal angle of ocellar triangle acute, VOL 0.74 × HE. Vertex crest straight. Occipital carina not visible in dorsal view.

Mesosoma. Pronotal disc strongly coriaceous, anterior margin carinate. Notauli deep, complete, evenly narrow, converging posterad. Propodeal disc 0.6 × as long as wide; basal triangle rugulose, posterolateral area scrobiculate; median carina posteriorly incomplete; lateral margins straight, diverging posterad; posterior carina well-defined, convex. Lateral of propodeum mostly imbricate. Propodeal declivity mostly rugulose.

Metasoma. Tergal process with very shallow, circular and sublateral pair of depressions; depressions 0.071 × as long as tergite II, parallel, distant each other 5.67 × maximum transverse diameter, with setae very short and laterad on anterior area, without pair of tubercles, with posterad tuft of setae ( Figs 76–78). Hypopygium with median stalk 0.91 × as long as hypopygeal plate; median stalk wide; corner of anterior margin angular; lateral stalk of hypopygium 0.05 × as long as median stalk; posterior margin weakly concave; corner rounded ( Fig. 120).

Genitalia ( Figs 207–209). Genital ring produced, each half convex in dorsal view. Basiparamere with dorsal surface rectangular, much narrower than ventral surface. Paramere with basal area wider than basiparamere apex; apex angulate; apical margin sinuous in ventral view, not curved. Basivolsella setose, with severalthick and short setae. Cuspis biramous. Aedeagus 2 × as long as wide; dorsal body of aedeagus wider medially, narrowing abruptly apicad, lateral margin strongly convex medially, converging apicad, not curved dorsad, apex with one pair of outer lobe; base of dorsal body of aedeagus strongly sclerotized, triangular, with median region truncate; ventral ramus of aedeagus surpassing half length of dorsal body, reaching base of apical lobe of dorsal body, lateral margin of ventral ramus sinuous, much wider medially and base as narrow as apex. Apodeme extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Phetchabun: Khao Kho NP, Nursery , 16°52.581’N 101°8.060’E, 520 m, Malaise trap, 26.x–2.xi.2006, Somchai Chatchumnan and Sa-ink Singtong leg., T814 GoogleMaps . Paratypes: THAILAND. Malaise trap, Loei: Phu Ruea NP , 1 ♂ Huay Taey ditch, 17°30.128’N 101°20.339’E, 1233 m, 12–19.viii.2006, Nukoonchai Jaroenchai leg., T529 GoogleMaps ; 1 ♂ Nern Pitsawong, Patikhom Tumtip leg., T314 , 1 ♂ 17°28.805’N 101°21.242’E, 870 m, T315 GoogleMaps . Phitsanulok: Thung Salaeng Luang NP, Pongpitak Pranee leg., Mixed deciduous forest 1 ♂ ( Gang Sopa watrfall) 16°52.642’N 100°49.441’E, 481 m, Pan trap, 15–16.x.2006, T755 GoogleMaps ; Malaise trap, 1 ♂ 16°50.699’N 100°51.266’E, 501 m, 11–18.ix.2006, T928 GoogleMaps ; 1 ♂ Dry evergreen 16°50.217’N 100°52.541’E, 580 m, 18–25.viii.2006, T570 GoogleMaps . Phetchabun: Nam Nao NP, Tham Pra Laad Forest Unit, Leng Janteab leg. , 1 ♂ 16°44.986’N 101°27.874’E, 711 m, 14–21.viii.2006, T428 GoogleMaps ; 1 ♂ Checkpoint , 16°43.687’N 101°33.754’E, 924 m, 1–8.iii.2007, T2284 GoogleMaps ; Helicopter landing ground, 16°43.184’N 101°35.137’E, 875 m, Noopean Hongyothi leg. GoogleMaps , 1 ♂ 3–10.vii.2006, T268 , 1 ♂ 10–17.vii.2006, T271 , 1 ♂ 24–30.vii.2006, T277 ; 16°43.156’N 101°35.118’E, 890 m, 1 ♂ 10–17.vii.2006, T272 , 3 ♂ 17–24.vii.2006, T275 ; 16°43.113’ N 101°35.134’E, 889 m, 1 ♂ 10–17.vii.2006, T273 , 1 ♂ 24–30.vii.2006, T279 ; Khao Kho NP, office, Somchai Chatchumnan & Sa-ink Singtong leg. , 1 ♂ 16°39.550’N 101°8.123’E, 230 m, 19–26.vii.2006, T170 GoogleMaps ; 1 ♂ 16°39.479’N 101°8.105’E, 220 m, 12–19.vii.2006, T166 GoogleMaps ; 2 ♂ View point at Klump stream 16°39.120’N 101°7.810’E, 246 m, 12–19.ix.2006, T591 GoogleMaps ; 1 ♂ Mixed deciduous forest, 16°32.561’N 101°2.479’E, 537 m, 26.xii.2006, 26.xii.2006 – 2.i.2007, T1187 GoogleMaps . Chaiyaphum: Tat Tone NP , 1 ♂ Near water tank, 15°58.426’N 102°2.240’E, 265 m, 12–19.ii.2007, Tawit Jaruphan & Orawan Budsawong leg., T1729 GoogleMaps ; 1 ♂ Next to Pa Eang waterfall, 15°57.657’N 101°54.724’E, 301 m, 12–19.x.2006, Tawit Jaruphan leg., T682 GoogleMaps ; 1 ♂ Water tank at Tat Fah waterfall, 15°56.468’N 102°5.855’E, 245 m, 26.iii–2.iv.2007, Tawit Jaruphan & Orawan Budsawong leg., T2357 GoogleMaps ; 1 ♂ Streamside at Tat Fah waterfall, 15°56.463’N 102°5.953’E, 242 m, 19–26.iii.2007, T2352 GoogleMaps . Suphanburi: 1 ♂, Pu Toei NP, car park/ Pu Krathing waterfall, 14°48.922’N 99°27.52’E, 7-14.iv.2009, Wangkum P. leg., T4616 GoogleMaps . Nakhon Nayok: Khao Yai NP , 1 ♂ San Jao Khaokeaw , Pong Sandao leg., 14°22.960’N 101°23.253’E, 750 m, 5– 12.iii.2007, T2102 GoogleMaps ; 1 ♂ Tail of Nhong Pak Chee , 14°27.167’N 101°21.850’E, 758 m, 5–12.xi.2006, T989 GoogleMaps ; 1 ♂ Moist evergreen forest near the reservoir, 14°27.119’N 101°21.482’E, 699 m, 19–26.xi.2006, Wirat Sookkho leg., T997 GoogleMaps .

Variations. Body length between 1.90 and 3.65 mm; LFW between 1.67 and 2.58 mm; maximum wing width between 0.72 and 1.03 mm; propodeal declivity with brilliant median band; posterior carina of propodeal disc with narrow median angulation or two paramedian concavities.

Remarks. Dissomphalus barbus sp. nov. is similar to D. magnetus sp. nov. and D. thaianus because of the following characteristics: basiparamere and paramere narrow in dorsal view, aedeagal dorsal body wide and aedeagal ventral ramus wider medially. However, D. barbus sp. nov. differs as follows: basiparamere with very wide ventral surface that hides aedeagal ventral ramus; dorsal body strongly inclined dorsad; aedeagal ventral ramus longer than half length of dorsal body, reaching base of apical lobe of dorsal body, apical region angulate, base extending beyond genital ring.

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