Dissomphalus perventriosus 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 : 19-20

Dissomphalus perventriosus Alencar & Azevedo , sp. nov.

( Figs. 66–70 )

Diagnosis: male. This species is easily diagnosed by the paramere very wide basally in dorsal view. The filament of ventral ramus inserted apically, nearly as long as ramus, convergent; the dorsal body with dorsal margin of outer lobe convex with small and rounded projection in lateral view; the basal bar triangular; the connector with lateral expansion rounded, mid part darker and bifurcate; and basal plate with upper margin concave, median lower margin straight are also useful to identify this species.

Description: male, body length 4.50 mm; LFW 3.00 mm. Color: head and mesosoma black, except pronotum dark castaneous with narrow posterior line castaneous; clypeus and metasoma dark castaneous; mandible castaneous, palpi and legs yellowish; antenna light and gradually darker distally; wings subhyaline.

Head: mandible bidentate. Clypeus with subtrapezoidal median lobe, median carina complete, tall in lateral view. Relative length of first four antennal segments ~10:4:4:5 segment XI 1.6x as long as wide. Frons 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 0.6x WOT; DAO 0.3x WOT; posterior ocellus distant from crest of vertex 1.5x DAO. Vertex somewhat straight; 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 0.72x as long as wide, irregularly rugose, median carina incomplete, lateral corner of posterior part elevate, weakly coriaceous and shinny; lateral surface of propodeum weakly coriaceous; declivity imbricate, median carina absent. Fore femur 3.5x as long as wide.

Metasoma: tergal process absent. Hypopygium with posterior margin concave.

Genitalia ( Figs. 66–70 ): paramere very wide basally in dorsal view; apex rounded and arched mesad; ventral margin strongly concave apically, apical corner large and rounded, concave basally; dorsal margin convex and much developed basally with subapical obtuse concavity ( Figs. 66, 67, 70 ). 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 medially except mid part concave, its base flat with narrow fold, outer margin convex, filament inserted apically, nearly as long as ramus, convergent, narrow, thin and arched dorsad ( Fig. 66 ); dorsal body with two pairs of apical lobes, as long as paramere, outer pair laminar, surface vertical, wide, apex straight, dorsal margin convex with small and rounded projection in lateral view ( Fig. 69 ) and with two concavities in dorsal view ( Fig. 67 ), ventral margin with subapical concavity and projection concave, inner pair membranous, hairy and granulate in ventral view; basal bar triangular, upper margin concave, lower margin almost touching basal plate; connector with lateral expansion rounded, mid part darker and bifurcate; basal plate with upper margin concave, median lower margin straight ( Fig. 67 ). Apodeme of aedeagus not extending beyond elliptical genital ring.

Material examined: HOLOTYPE: male, VENEZUELA, Táchira, 8 km SE San Cristóbal, 1425–1450 m, [~ 7º46’01”N 72º13’30”W], 25–31.v.1998, FIT, Ashe, Brooks & Hanley col. ( CNCI) . PARATYPE: 1 male, VENEZUELA, Mérida, 42.4 km NW Merida, 2360 m, [~ 8º35’54”N 71º08’42”W], 22–25.v.1998, FIT, Ashe, Brooks & Hanley col. ( CNCI) .

Variation: metasoma lighter than the holotype and lateral posterior corner of propodeal disc polished.

Comments: this species is similar to D. uncus by having the filament of ventral ramus inserted apically and the outer lobe of dorsal body with the dorsal margin with two concavities in dorsal view. But D. perventriosus has paramere very wide basally in dorsal view, filament of ventral ramus convergent, dorsal margin of outer lobe with median small and rounded projection, whereas D. uncus has paramere much less wide basally in dorsal view, filament of ventral ramus sinuous and dorsal margin of outer lobe without median small and rounded projection.

Etymology: the specific Latin epithet refers to the shape of paramere, which resembles a “pot-belly” in lateral view.

Distribution: Venezuela.

Figures

FIGURES 66–77. 66–70, Dissomphalus perventriosus. 66, genitalia, ventral view; 67, genitalia, dorsal view; 68, outer lobe, ventral view; 69, apex of dorsal body, lateral view; 70, paramere, lateral view; 71–77 Dissomphalus pilus. 71, tergal process, dorsal view; 72, genitalia, ventral view; 73, genitalia, dorsal view; 74, outer lobe, ventral view; 75, apex of outer lobe, lateral view;76, filament of ventral ramus, lateral view; 77, paramere, lateral view. (Scale bars = 250 µm).