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

Dissomphalus paululus Alencar & Azevedo , sp. nov.

( Figs. 47–52 )

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 ): 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 ): 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 ). 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 ); dorsal body with two pairs of apical lobes, outer pair laminar, surface vertical, wide, apex divergent, dorsal margin convex in lateral view ( Fig. 51 ) and sinuous in dorsal view ( Fig. 49 ), ventral margin with subapical strong concavity and projection straight and serrate ( Figs. 50 ), 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 ). 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) . PARATYPE: 1 male, ECUADOR, [Napo], Dureno ( Orient ), 150–200 m, [~ 0º02’40”N 76º41’50”W], 23–28.ix.1977 ( CNCI) .

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.

Figures

FIGURES 41–52. 41–46, Dissomphalus osseus. 41, tergal process, dorsal view; 42, genitalia, ventral view; 43, genitalia, dorsal view; 44, outer lobe, ventral view; 45, apex of dorsal body, lateral view; 46, paramere, lateral view; 47–52, Dissomphalus paululus. 47, tergal process, dorsal view; 48, genitalia, ventral view; 49, genitalia, dorsal view; 50, outer lobe, ventral view; 51, apex of dorsal body, lateral view; 52, paramere, lateral view. (Scale bars = 250 µm).