Dissomphalus hetus 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 : 41-43

Dissomphalus hetus Mugrabi & Azevedo , sp. nov.

( Figs 57–59 , 113, 188–191)

Description. MALE. Body length 1.67 mm. LFW 1.56 mm. Maximum wing width 0.65 mm. Color. Head black; mesosoma dark castaneous; metasoma dark castaneous with castaneous spots.

Head. Mandible with three apical teeth. Clypeus with median lobe ill-defined; with one tooth, median tooth rounded; median carina distinctly incomplete apically, straight in profile or nearly so. Ratio of first four antennal segments about 9:5:3:4. Frons weakly coriaceous, punctures small. LH 1 × WH, WF 0.62 × WH, WF 1.29 × HE, OOL 1.25 × WOT, DAO 0.5 × WOT, posterior ocelli distant from vertex crest 0.25 × DAO, frontal angle of ocellar triangle right, VOL 0.64 × HE. Vertex crest strongly convex. Occipital carina visible in dorsal view.

Mesosoma. Pronotal disc weakly coriaceous, anterior margin carinate. Notauli shallow, incomplete, not reaching posterior margin of mesoscutum, evenly wide, converging posterad. Propodeal disc 0.88 × as long as wide; basal triangle rugulose, posterolateral area polished; median carina anteriorly incomplete; lateral margins straight, parallel; posterior carina well-defined, with median concavity. Lateral of propodeum mostly imbricate. Propodeal declivity mostly strigate.

Metasoma. Tergal process with very shallow, subcircular and sublateral pair of depressions; depressions 0.54 × as long as tergite II, diverging posterad, distant each other 4 × maximum transverse diameter, with setae very short and dorsad on latera area, without pair of tubercles, with laterad tuft of setae ( Figs 57–59 ). Hypopygium with median stalk 0.56 × as long as hypopygeal plate; median stalk narrow; corner of anterior margin angular; lateral stalk of hypopygium 0.33 × as long as median stalk; posterior margin weakly concave; corner rounded (Fig. 113).

Genitalia ( Figs 188–191 ). Genital ring produced, each half sinuous in dorsal view. Basiparamere with dorsal surface much wider apicad, much narrower than ventral surface. Paramere with basal area as wide as basiparamere apex, ventral margin slightly excavated forming a projection with apex truncate in lateral view and subangulate in dorsal view; apical margin subangulate in ventral view, not curved. Basivolsella setose, with three thick and short setae. Cuspis biramous. Aedeagus 2.66 × as long as wide; dorsal body of aedeagus narrower apically, narrowing progressively apicad, lateral margin weakly convex, converging apicad, wholly slightly curved dorsad, apex with one pair of outer lobe; base of dorsal body of aedeagus strongly sclerotized, triangular, with median region angulate; 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 apex much narrower than base. Apodeme extending beyond genital ring.

FEMALE unknown.

Material examined. Holotype, ♂. THAILAND. Loei: Phu Ruea NP, Subhnonghin , 17°28.772’N 101°21.308’E, 860 m, Malaise trap, 19–26.vii.2006, Nukoonchai Jaroenchai leg., T316 . Paratypes: THAILAND. Malaise trap , Loei: 1 ♂ Phu Ruea NP, Nature trail, 17°30.740’N 101°20.650’E, 1353 m, 12–19.ix.2006, Nukoonchai Jaroenchai leg., T828 ; Phu Kradueng NP, Savannah in pine forest, 16°53.092’N 101°47.413’E, 1257 m, 1 ♂ 28.xii.2006 – 3.i.2007, Sutin Gongla-sae leg., T1220 ; 3–9.i.2007, 1 ♂ Thanongsak Srisa-ad leg., T1223 . Phetchabun: 1 ♂ Nam Nao NP, Heliport , 16°43.156’N 101°35.118’E, 890 m, 18–25.xii.2006, Noopean Hongyothi leg., T1433 . Ubon Ratchathani: 1 ♂ Pha Taem NP, Huay Pok waterfall, 15°37.321’N 105°36.982’E, 419 m, 27.x–3.xi.2006, Pornthip Tonsu leg., T730 . Chaiyaphum: 1 ♂ Pa Hin Ngam NP, Thung Dok Kra Jeow in Dry evergreen, 15°38.438’N 101°23.576’E, 780 m, 7–13.i.2007, Katae Sa-nog & Buakaw Adnafai leg., T1457 . Nakhon Nayok: 1 ♂ Khao Yai NP, Moist evergreen forest near the reservoir, 14°27.119’N 101°21.482’E, 699 m, 5–12.xi.2006, Wirat Sookkho leg., T991 .

Variations. Body length between 1.67 and 2.01 mm; LFW between 1.55 and 1.71 mm; maximum wing width between 0.65 and 0.72 mm; depression of tergal process elliptical, with anterior setosesetose tuft.

Remarks. Dissomphalus hetus sp. nov. is similar to D. gionus sp. nov., D. davus sp. nov. and D. paulus sp. nov. because of the following characteristics: aedeagal dorsal body rectangular; ventral surface of aedeagal dorsal body with long and very thick seta; paramere almost as long as basiparamere.

It is also similar to However, D. hetus sp. nov. exhibits more similarities with D. paulus sp. nov., including the following characteristics: hypopygium about 2.00 × as wide as long, median stalk short with rounded apex, posterior margin strongly concave with rounded corners, which are projected more than median region; genital ring slightly convex, median region with inclination angle about 45º, aedeagal dorsal body rectangular, converging apicad, apical constriction weak, ventral surface with long and very thick seta; paramere almost as long as basiparamere. However D. hetus sp. nov. differs from D. paulus sp. nov. as follows: depressions of tergal process sub-circular, very shallow, distant each other 4.00 × their maximum transverse diameter, tubercle absent; genital ring convex; basiparamere with dorsal surface shorter than ventral surface; paramere with ventral surface slightly divided, apical margin sub-angulate in ventral view; aedeagal ventral ramus narrow, with margin sinuous, narrowing apicad, apex angulate, surpassing half length of aedeagal dorsal body; aedeagal apodeme wide. In addition, this species exhibits thick black seta across the body, and the posterior transverse carina of the propodeal disc invades the median region of the declivity, where it acquires a concave shape and thus falsely seems to be a carina of the declivity rather than the disc.

Distribution. Thailand (Loei, Phetchabun, Ubon Ratchathani, Chaiyaphum and Nakhon Nayok).

Figures

FIGURES 54–68. Metasoma, 54– 56, Dissomphalus zethus sp. nov., 54, metasoma in dorsal view; 55, tergal process of metasoma in dorsal view; 56, tuft of setae of tergal process in dorsal view; 57–59, D. hetus sp. nov., 57, metasoma in dorsal view; 58, tergal process of metasoma in dorsal view; 59, tuft of setae of tergal process in dorsal view; 60–61, D. joelus sp. nov.,

FIGURES 186–193. Male genitalia, 186–187, Dissomphalus zethus sp. nov., 186, dorsal view; 187, ventral view; 188–191, D. hetus sp. nov., 188, dorsal view; 189, ventral view; 190, lateral view; 191, apex of aedeagus in ventral view; 192–193, D. joelus