Dissomphalus paululus 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 : 14-15

publication ID

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



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scientific name

Dissomphalus paululus Alencar & Azevedo

sp. nov.

Dissomphalus paululus Alencar & Azevedo , sp. nov.

( Figs. 47–52 View FIGURES 41–52 )

Diagnosis: male. This species is easily diagnosed by the unique combination of characters: the paramere wide subapically in dorsal view; the filament of ventral ramus inserted subapically, shorter than size of base and convergent; the dorsal body with apex divergent, the basal bar triangular, upper margin with median angled concavity; the connector c–shaped apically; and the basal plate with median projection to apex in upper margin and lower margin concave.

Description: male, body length 4.50 mm; LFW 3.30 mm. Color: head and mesosoma black; clypeus and metasoma dark castaneous; mandible, palpi and legs yellowish; antenna light castaneous and gradually darker distally; wings subhyaline.

Head: mandible bidentate. Clypeus with trapezoidal median lobe, median carina complete. Relative length of first four antennal segments ~13:4:4:5, segment XI 1.6x as long as wide. Frons strongly coriaceous, punctures small and shallow, separated by 0.5–2.0x their diameter. LH 1.0x WH; WF 0.6x WH; WF 1.3x HE; OOL 0.6x WOT; DAO 0.3x WOT; posterior ocellus distant from crest of vertex 1.5x DAO. Vertex somewhat concave; VOL 0.6x HE.

Mesosoma: thoracic dorsum weakly coriaceous, punctures smaller and sparser than those of frons. Pronotal disc 0.6x length of mesoscutum. Notaulus complete. Propodeal disc 0.6x as long as wide, irregularly rugose, median carina incomplete, posterior part elevate, polished and shinny; lateral surface of propodeum imbricate; declivity imbricate, median carina incomplete posteriorly. Fore femur 3.3x as long as wide.

Metasoma ( Fig. 47 View FIGURES 41–52 ): tergite II with pair of circular, small and very shallow lateral depression, separated by 3.6x their diameter, each depression with pit with raised rims, and one seta directed backward, antero-lateral margin with short setae. Hypopygium with posterior margin concave.

Genitalia ( Figs. 48–52 View FIGURES 41–52 ): paramere wide subapically in dorsal view; apex rounded and arched mesad; ventral margin strongly concave, apical corner large and rounded, somewhat concave basally; dorsal margin convex with subapical acute concavity ( Figs. 48, 49, 52 View FIGURES 41–52 ). Dorsal margin of basiparamere concave. Cuspis long and arched, apex rounded, digitus with apex pointed and smooth in upper margin. Aedeagus with ventral ramus shorter than dorsal body, laminar, surface horizontal, inner margin straight in ventral view, ventrad except base flat with narrow fold, outer margin convex, basally with ventral fold, filament inserted subapically, shorter than size of base, convergent, narrow, thin and arched dorsad ( Fig. 48 View FIGURES 41–52 ); dorsal body with two pairs of apical lobes, outer pair laminar, surface vertical, wide, apex divergent, dorsal margin convex in lateral view ( Fig. 51 View FIGURES 41–52 ) and sinuous in dorsal view ( Fig. 49 View FIGURES 41–52 ), ventral margin with subapical strong concavity and projection straight and serrate ( Figs. 50 View FIGURES 41–52 ), inner pair irregular, membranous, and hairy; basal bar triangular, upper margin with median angled concavity, lower margin almost touching basal plate; connector c-shaped apically; basal plate with upper margin with median projection to apex, lower margin convex ( Fig. 49 View FIGURES 41–52 ). Apodeme of aedeagus extending somewhat beyond elliptical genital ring.

Material examined: HOLOTYPE: male, ECUADOR, Sucumbios, Rio Napo, Sacha Lodge , 225 m, 0° 30’S 76° 30’W, 12–22.vi.1995, MT, P. Hibbs col. ( CNCI) GoogleMaps . PARATYPE: 1 male, ECUADOR, [Napo], Dureno ( Orient ), 150–200 m, [~ 0º02’40”N 76º41’50”W], 23–28.ix.1977 ( CNCI) GoogleMaps .

Variation: tergal process with pit smaller than holotype.

Comments: this species has the shortest filament of the ventral ramus and the largest apical corner of the ventral margin of the paramere among known species of the group.

Etymology: the specific Latin epithet refers to the short filament of ventral ramus.

Distribution: Ecuador.


Canadian National Collection Insects