Dissomphalus forceps Alencar & Azevedo, 2008

Alencar, I. D. C. C. & Azevedo, C. O., 2008, A new species-group of Dissomphalus (Hymenoptera: Bethylidae), with description of thirteen new species, Zootaxa 1851 (1), pp. 1-28 : 10-11

publication ID

https://doi.org/ 10.11646/zootaxa.1851.1.1



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scientific name

Dissomphalus forceps Alencar & Azevedo

sp. nov.

Dissomphalus forceps Alencar & Azevedo , sp. nov.

( Figs. 28–33 View FIGURES 28–40 )

Diagnosis: male. This species differs from the other species of the group by having the filament of ventral ramus with the apical margin of the filament concave and the dorsal body with the outer lobe with horizontal surface. The dorsal body slightly shorter than ventral ramus; the outer lobe tweezers-like; and the basal bar yshaped are also useful to separate this species from the remainder.

Description: male, body length 4.80 mm; LFW 3.60 mm. Color: head and mesosoma black, except pronotum castaneous; clypeus and metasoma dark castaneous; mandible and flagellomeres castaneous; palpi and legs yellowish, except tibia darker; wings subhyaline.

Head: mandible bidentate. Clypeus with trapezoidal median lobe, median carina complete. Relative length of first four antennal segments ~18:6:5:7, segment XI 1.7x as long as wide. Frons weakly coriaceous, punctures small and shallow, separated by 1.0–2.0x their diameter. LH 1.0x WH; WF 0.6x WH; WF 1.4x HE; OOL 0.7x WOT; DAO 0.2x WOT; posterior ocellus distant from crest of vertex 1.3x DAO. Vertex concave; VOL 0.9x HE.

Mesosoma: thoracic dorsum weakly coriaceous, except propodeal disc strongly coriaceous, punctures smaller, shallower and sparser than those of frons. Pronotal disc 0.6x length of mesoscutum. Notaulus complete. Propodeal disc 0.7x as long as wide, irregularly rugose, median carina complete, lateral corner of posterior part imbricate and shiny; lateral surface of propodeum weakly coriaceous; declivity imbricate, median carina complete, surrounded by perpendicular striae. Fore femur 2.3x as long as wide.

Metasoma ( Fig. 28 View FIGURES 28–40 ): tergite II with pair of circular, large and very shallow lateral depressions, separated by 3x their diameter, each depression with small tubercle, which has pit on top, and one short seta directed backwards, antero-lateral margin with long setae. Hypopygium with posterior margin concave.

Genitalia ( Figs. 29–33 View FIGURES 28–40 ): paramere evenly wide in dorsal view, with apex rounded and arched mesad, ventral margin slightly concave apically, apical corner slight, straight basally; dorsal margin somewhat convex without subapical concavity ( Figs. 29, 30, 33 View FIGURES 28–40 ). Basiparamere wide in dorsal view, dorsal margin somewhat concave. Cuspis long and arched, apex rounded, digitus wide, apex rounded. Aedeagus with ventral ramus ( Fig. 29 View FIGURES 28–40 ) laminar, surface horizontal, inner margin straight in ventral view, outer margin convex, filament inserted subapically, nearly as long as ramus, somewhat convergent, arched dorsad, basal part of filament slightly dilated, apical margin of filament concave ( Fig. 31 View FIGURES 28–40 ); dorsal body with two pairs of apical lobes, slightly shorter than ventral ramus, outer pair laminar, surface horizontal, inner margin concave, outer margin convex, inner pair narrow and pointed, membranous, hairy and granulate ( Figs. 30, 32 View FIGURES 28–40 ); basal bar y-shaped; basal plate absent. Apodeme of aedeagus extending beyond circular genital ring.

Material examined: HOLOTYPE: male, BOLIVIA, Cochabamba 117 km E Cochabamba on Villa Tunari road, 1040 m, 17º6.53’S 65º41.20W, FIT, 1–6.ii.1999, R. S. Hanley col. ( CNCI) GoogleMaps . PARATYPES: 2 males, BOLIVIA, Cochabamba, Est [ación] Biol [ogica] Valle del Saita , 67.5 kmE Villa Tunari , rain forest, 17º6’19”S 64º46’57”W, 7–9.II.1999, FIT, F. Génier col. ( CNCI) GoogleMaps ; 1 male, PERU, Madre de Dios, Avispas , 400 m, [~ 14º8’S 75º55’W], ix.10/30–62 {10–30.ix.1962}, Pena col. ( MCZH) GoogleMaps .

Variation: body length from 3.35 to 4.8 mm; pronotum black, metasoma castaneous, punctures of frons shallower, tergal process with depression deep and inclined, tubercle small or large, with two or three setae mesad, slightly closer to each other and to the posterior margin of first tergite.

Etymology: the specific Latin epithet refers to the outer lobe of the dorsal body, which resembles a pair of forceps.

Distribution: Bolivia, Peru.


Canadian National Collection Insects