Dissomphalus pronus Alencar & Azevedo

Alencar, I. D. C. C. & Azevedo, C. O., 2006, Definition of the coronatus species-group (Hymenoptera: Bethylidae, Dissomphalus) with description of thirteen new species, Zootaxa 1330, pp. 1-26: 18-20

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http://doi.org/ 10.5281/zenodo.174206

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Dissomphalus pronus Alencar & Azevedo

New Species

Dissomphalus pronus Alencar & Azevedo   , New Species

( Figs. 24–27 View FIGURES 24 – 34. 24 – 27 )

Diagnosis: aedeagus with ventral ramus shorter than dorsal body, basal half wide, apical half narrowing dorsally and converging mesad, apex folded laterad; dorsal body wide, narrowing to apex, apical part with concavity mesad, apex with two arms, dorsal one short and rounded, ventral one wide, subapical and directed laterad; crown-process small.

Description: male, body length 2.8mm; LFW 2.1mm. Color: head black; clypeus, mandible and mesosoma dark castaneous; metasoma rufous castaneous; palpi and legs light castaneous; antenna gradually darker in distal part; wings subhyaline.

Head: mandible tridentate, uppermost tooth inconspicuous. Clypeus with trapezoidal median lobe, median carina complete and strongly developed in profile. First four antennal segments in ratio of ~ 24: 5: 8: 7, segment XI 2.3 x as long as wide. Frons weakly coriaceous and shiny, punctures shallow, separated by 1.5 –2.0x their diameter. LH 1.1 x WH; WF 0.7 x WH; WF 1.7 x HE; OOL 1.0x WOT; DAO 0.4 x WOT; posterior ocelli distant from crest of vertex 0.8 x DAO. Vertex straight with rounded corners; VOL 1.1 x HE.

Mesosoma: thoracic dorsum somewhat coriaceous and shiny, punctures inconspicuous and hair longer than on frons. Pronotal disc 0.39 x length of mesoscutum, anterior margin not carinate with rounded foveae. Notaulus incomplete. Propodeal disc 0.8 x as long as wide, irregularly rugose, median carina incomplete, posterior part polished and shiny; lateral surface of propodeum with striae which become finer posteriorly; declivity reticulate striate. Fore femur 3.6 x as long as wide.

Metasoma: tergum II with pair of circular, large and deep lateral depressions, separated by 0.6 x their diameter; each depression with tuft of convergent setae directed backward, antero-lateral margin with long setae. Hypopygium with posterior margin convex.

Genitalia ( Figs. 24–27 View FIGURES 24 – 34. 24 – 27 ): paramere wide in lateral view, inner surface of apex with distinct long seta, apex arched mesad, dorsal margin straight with subapical concavity, ventral margin concave. Basiparamere as same size as paramere. Cuspis long, digitus arched ventrally, base with long seta and short rounded protuberance. Aedeagus with ventral ramus shorter than dorsal body, laminar, surface horizontal and angulate ventrally, basal half long and wide, inner margin sinuous, apical half narrowing to apex and converging mesad of genitalia, apex folded laterad; dorsal body wide, surface vertical, apical part with concavity mesad, apex with two arms ( Fig. 26, 27 View FIGURES 24 – 34. 24 – 27 ); dorsal arm short and rounded, ventral one wide, subapical and directed laterad; crown-process small. Apodeme of aedeagus not extending beyond elliptical genital ring.

Material examined: HOLOTYPE: male, COSTA RICA, Monteverde, 1520m, 25.VI – 2.VII. 1983, D. H. Lindeman col. ( PMAE). PARATYPE: 1 male same data as holotype ( PMAE).

Comments: this species has genitalia similar to those of D. ramosus   in having the ventral ramus with apex folded and dorsal body with two arms. However, D. pronus   has both arms with a serrate margin and the apex rounded, whereas D. ramosus   has three arms on the apex of the dorsal body with the dorsal one thicker than the others and straight with its outer margin serrate and apex rounded slightly converging mesad; median arm longer and thinner than dorsal one, directed laterad; ventral arm shorter than others with apex thin and folded ventrally and laterad. Beyond these differences in arm details, D. pronus   has the crown-process small, whereas D. ramosus   has the crown-process with a long lateral prolongation in the middle of the dorsal body.

Etymology: specific epithet comes from Latin and refers to ventral ramus of aedeagus with apex folded.

Distribution: Costa Rica.


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